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  • Bücher  (31)
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  • 2005-2009
  • 1995-1999  (55.893)
  • 1996  (55.893)
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  • Bücher  (31)
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  • 2005-2009
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  • 1
    Unbekannt
    Basel, Boston, Berlin : Birkhäuser
    Schlagwort(e): geodynamics ; geophysics ; seismology
    Beschreibung / Inhaltsverzeichnis: Geodynamics concerns the dynamics of the earth's global motion, of the earth's interior motion and its interaction with surface features, together with the mechanical processes in the deformation and rupture of geological structures. Its final object is to determine the driving mechanism of these motions. It is highly interdisciplinary. In providing the basic geological, geophysical infromation required for a comprehensive mechanical analysis, there are also many mechanical problems involved, which means the problem is coupled intricately with geophysics, rock mechanics, seismology, structural geology, etc. This is Part II of the Proceedings of an IUTAM/IASPEI Symposium on Mechanics Problems in Geodynamics held in Beijing, September 1994. It discusses different aspects of mechanics problems in geodynamics involving the earth's rotation, tectonic analyses of various parts of the world, mineral physics and flow in the mantle, seismic source studies and wave propagation and application of the DDA method in tectonic analysis.
    Seiten: Online-Ressource (336 Seiten)
    ISBN: 9783764354121
    Sprache: Englisch
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Unbekannt
    Basel, Boston, Berlin : Birkhäuser
    Schlagwort(e): seismic waves ; geophysics ; seismology
    Beschreibung / Inhaltsverzeichnis: The special issue contains contributions presented at the international workshop Seismic waves in laterally inhomo- geneous media IV, which was held at the Castle of Trest, Czech Republic, May 22-27, 1995. The workshop, which was attended by about 100 seismologists from more than 10 countries, was devoted mainly to the current state of theoretical and computational means of study of seismic wave propagation in complex structures. The special issue can be of interest for theoretical, global and explorational seismologists. The first part contains papers dealing with the study and the use of various methods of solving forward and inverse problems in complicated structures. Among other methods, discrete-wave number method, the finite-difference method, the edge-wave supperposition method and the ray method are studied and used. Most papers contained in the second part are related to the ray method. The most important topics are two-point ray tracing, grid calculations of travel times and amplitudes and seismic wave propagation in anisotropic media.
    Seiten: Online-Ressource (342 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9783764356484
    Sprache: Englisch
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Unbekannt
    Paris : OECD/IEA
    Schlagwort(e): energy ; energy economics
    Seiten: Online-Ressource (XVII, 300 Seiten)
    ISBN: 9264148167
    Sprache: Englisch
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Unbekannt
    London : The Geological Society
    Schlagwort(e): Paläoklimatologie ; Paläoozeanographie ; Sediment ; Meeressediment ; Seesediment ; Schichtung, Geologie ; Paläoklima ; Rhythmit ; Paläolimnologie ; Marine sediments ; Paleoclimatology ; Paleoceanography
    Beschreibung / Inhaltsverzeichnis: Alan E. S. Kemp: Laminated sediments as palaeo-indicators / Geological Society, London, Special Publications, 116:vii-xii, doi:10.1144/GSL.SP.1996.116.01.01 --- Controls on Formation and Strategies for Study --- Roger Y. Anderson: Seasonal sedimentation: a framework for reconstructing climatic and environmental change / Geological Society, London, Special Publications, 116:1-15, doi:10.1144/GSL.SP.1996.116.01.02 --- Constance Sancetta: Laminated diatomaceous sediments: controls on formation and strategies for analysis / Geological Society, London, Special Publications, 116:17-21, doi:10.1144/GSL.SP.1996.116.01.03 --- Neal R. O’Brien: Shale lamination and sedimentary processes / Geological Society, London, Special Publications, 116:23-36, doi:10.1144/GSL.SP.1996.116.01.04 --- Methods and Techniques --- Jennifer Pike and Alan E. S. Kemp: Preparation and analysis techniques for studies of laminated sediments / Geological Society, London, Special Publications, 116:37-48, doi:10.1144/GSL.SP.1996.116.01.05 --- Bernd Zolitschka: Image analysis and microscopic investigation of annually laminated lake sediments from Fayetteville Green Lake (NY, USA) Lake C2 (NWT, Canada) and Holzmaar (Germany): a comparison / Geological Society, London, Special Publications, 116:49-55, doi:10.1144/GSL.SP.1996.116.01.06 --- Lacustrine Environments --- Konrad A. Hughen, Jonathan T. Overpeck, Robert F. Anderson, and Kerstin M. Williams: The potential for palaeoclimate records from varved Arctic lake sediments: Baffin Island, Eastern Canadian Arctic / Geological Society, London, Special Publications, 116:57-71, doi:10.1144/GSL.SP.1996.116.01.07 --- Gunilla Petterson: Varved sediments in Sweden: a brief review / Geological Society, London, Special Publications, 116:73-77, doi:10.1144/GSL.SP.1996.116.01.08 --- A. B. Leslie, A. C. Kendall, G. M. Harwood, and D. W. Powers: Conflicting indicators of palaeodepth during deposition of the Upper Permian Castile Formation, Texas and New Mexico / Geological Society, London, Special Publications, 116:79-92, doi:10.1144/GSL.SP.1996.116.01.09 --- California Borderland Basins --- D. S. Gorsline, Enrique Nava-Sanchez, and Janette Murillo de Nava: A survey of occurrences of Holocene laminated sediments in California Borderland Basins: products of a variety of depositional processes / Geological Society, London, Special Publications, 116:93-110, doi:10.1144/GSL.SP.1996.116.01.10 --- James W. Hagadorn: Laminated sediments of Santa Monica Basin, California continental borderland / Geological Society, London, Special Publications, 116:111-120, doi:10.1144/GSL.SP.1996.116.01.11 --- Arndt Schimmelmann and Carina B. Lange: Tales of 1001 varves: a review of Santa Barbara Basin sediment studies / Geological Society, London, Special Publications, 116:121-141, doi:10.1144/GSL.SP.1996.116.01.12 --- David Bull and Alan E. S. Kemp: Composition and origins of laminae in late Quaternary and Holocene sediments from the Santa Barbara Basin / Geological Society, London, Special Publications, 116:143-156, doi:10.1144/GSL.SP.1996.116.01.13 --- Continental Margin and Other Marine Basins --- Jennifer Pike and Alan E. S. Kemp: Records of seasonal flux in Holocene laminated sediments, Gulf of California / Geological Society, London, Special Publications, 116:157-169, doi:10.1144/GSL.SP.1996.116.01.14 --- Konrad A. Hughen, Jonathan T. Overpeck, Larry C. Peterson, and Robert F. Anderson: The nature of varved sedimentation in the Cariaco Basin, Venezuela, and its palaeoclimatic significance / Geological Society, London, Special Publications, 116:171-183, doi:10.1144/GSL.SP.1996.116.01.15 --- H. Schulz, U. Von Rad, and U. Von Stackelberg: Laminated sediments from the oxygen-minimum zone of the northeastern Arabian Sea / Geological Society, London, Special Publications, 116:185-207, doi:10.1144/GSL.SP.1996.116.01.16 --- Grzegorz Haczewski: Oligocene laminated limestones as a high-resolution correlator of palaeoseismicity, Polish Carpathians / Geological Society, London, Special Publications, 116:209-220, doi:10.1144/GSL.SP.1996.116.01.17 --- Deep-sea Laminated Sediment Records --- R. B. Pearce, A. E. S. Kemp, J. G. Baldauf, and S. C. King: High-resolution sedimentology and micropalaeontology of laminated diatomaceous sediments from the eastern equatorial Pacific Ocean (Leg 138) / Geological Society, London, Special Publications, 116:221-241, doi:10.1144/GSL.SP.1996.116.01.18 --- Alan E. S. Kemp, Jack G. Baldauf, and Richard B. Pearce: Origins and palaeoceangraphic significance of laminated daitom ooze from the Eastern Equatorial Pacific Ocean / Geological Society, London, Special Publications, 116:243-252, doi:10.1144/GSL.SP.1996.116.01.19
    Seiten: Online-Ressource (XII, 258 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1897799675
    Sprache: Englisch
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Schlagwort(e): Paläohydrologie
    Beschreibung / Inhaltsverzeichnis: The Context of Palaeohydrology --- K. J. Gregory: Introduction / Geological Society, London, Special Publications, 115:1-8, doi:10.1144/GSL.SP.1996.115.01.01 --- L. Starkel: Palaeohydrological reconstruction: advantages and disadvantages / Geological Society, London, Special Publications, 115:9-17, doi:10.1144/GSL.SP.1996.115.01.02 --- Nigel W. Arnell: Palaeohydrology and future climate change / Geological Society, London, Special Publications, 115:19-25, doi:10.1144/GSL.SP.1996.115.01.03 --- J. M. Adams and H. Faure: Changes in moisture balance between glacial and interglacial conditions: influence on carbon cycle processes / Geological Society, London, Special Publications, 115:27-42, doi:10.1144/GSL.SP.1996.115.01.04 --- D. E. Walling: Erosion and sediment yield in a changing environment / Geological Society, London, Special Publications, 115:43-56, doi:10.1144/GSL.SP.1996.115.01.05 --- A. G. Brown: Human dimensions of palaeohydrological change / Geological Society, London, Special Publications, 115:57-72, doi:10.1144/GSL.SP.1996.115.01.06 --- V. R. Baker: Discovering Earth’s future in its past: palaeohydrology and global environmental change / Geological Society, London, Special Publications, 115:73-83, doi:10.1144/GSL.SP.1996.115.01.07 --- Approaches to Palaeohydrological Analysis --- Mediterranean, Tropical and Monsoon Regions --- G. Benito, M. J. Machado, and A. Pérez-González: Climate change and flood sensitivity in Spain / Geological Society, London, Special Publications, 115:85-98, doi:10.1144/GSL.SP.1996.115.01.08 --- Ian C. Fuller, Mark G. Macklin, David G. Passmore, Paul A. Brewer, John Lewin, and Ann G. Wintle: Geochronologies and environmental records of Quaternary fluvial sequences in the Guadalope basin, northeast Spain, based on luminescence dating / Geological Society, London, Special Publications, 115:99-120, doi:10.1144/GSL.SP.1996.115.01.09 --- Yehouda Enzel, Lisa L. Ely, P. Kyle House, and Victor R. Baker: Magnitude and frequency of Holocene palaeofloods in the southwestern United States: A review and discussion of implications / Geological Society, London, Special Publications, 115:121-137, doi:10.1144/GSL.SP.1996.115.01.10 --- Michael F. Thomas and Martin B. Thorp: The response of geomorphic systems to climatic and hydrological change during the Late Glacial and early Holocene in the humid and sub-humid tropics / Geological Society, London, Special Publications, 115:139-153, doi:10.1144/GSL.SP.1996.115.01.11 --- Vishwas S. Kale, Lisa L. Ely, Yehouda Enzel, and Victor R. Baker: Palaeo and historical flood hydrology, Indian Peninsula / Geological Society, London, Special Publications, 115:155-163, doi:10.1144/GSL.SP.1996.115.01.12 --- Cold Regions --- Paul A. Carling: A preliminary palaeohydraulic model applied to late Quaternary gravel dunes: Altai Mountains, Siberia / Geological Society, London, Special Publications, 115:165-179, doi:10.1144/GSL.SP.1996.115.01.13 --- A. F. Yamskikh: Late Quaternary intra-continental river palaeohydrology and polycyclic terrace formation: the example of south Siberian river valleys / Geological Society, London, Special Publications, 115:181-190, doi:10.1144/GSL.SP.1996.115.01.14 --- Temperate Regions --- J. M. Hooke: River responses to decadal-scale changes in discharge regime: the Gila River, SE Arizona / Geological Society, London, Special Publications, 115:191-204, doi:10.1144/GSL.SP.1996.115.01.15 --- T. Kalicki: Climatic or anthropogenic alluviation in Central European valleys during the Holocene? / Geological Society, London, Special Publications, 115:205-215, doi:10.1144/GSL.SP.1996.115.01.16 --- Barbara T. Rumsby and Mark G. Macklin: River response to the last neoglacial (the ‘Little Ice Age’) in northern, western and central Europe / Geological Society, London, Special Publications, 115:217-233, doi:10.1144/GSL.SP.1996.115.01.17 --- A Future for Palaeohydrology --- J. Branson, K. J. Gregory, and M. J. Clark: Issues in scientific co-operation on information sharing: the case of palaeohydrology / Geological Society, London, Special Publications, 115:235-249, doi:10.1144/GSL.SP.1996.115.01.18 --- J. R. Pilcher: The Past Global Changes (PAGES) Project / Geological Society, London, Special Publications, 115:251-256, doi:10.1144/GSL.SP.1996.115.01.19 --- A. G. Brown: Palaeohydrology: prospects and future advances / Geological Society, London, Special Publications, 115:257-265, doi:10.1144/GSL.SP.1996.115.01.20
    Seiten: Online-Ressource (VI, 272 Seiten) , Illustrationen, Diagramme, Karten
    Sprache: Englisch
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Schlagwort(e): Malm ; Zentrale Nordsee ; Geology ; Hydrocarbons ; North Sea
    Beschreibung / Inhaltsverzeichnis: J. J. Veldkamp, M. G. Gaillard, H. A. Jonkers, B. K. Levell, M. G. Gaillard, and H. A. Jonkers: A Kimmeridgian time-slice through the Humber Group of the central North Sea: a test of sequence stratigraphic methods / Geological Society, London, Special Publications, 114:1-28, doi:10.1144/GSL.SP.1996.114.01.01 --- Alan Carruthers, Tom Mckie, John Price, Robin Dyer, Gwydion Williams, and Paul Watson: The application of sequence stratigraphy to the understanding of Late Jurassic turbidite plays in the Central North Sea, UKCS / Geological Society, London, Special Publications, 114:29-45, doi:10.1144/GSL.SP.1996.114.01.02 --- M. J. David: History of hydrocarbon exploration in the Moray Firth / Geological Society, London, Special Publications, 114:47-80, doi:10.1144/GSL.SP.1996.114.01.03 --- Richard J. Davies, Kevin J. Stephen, John R. Underhill, Richard J. Davies, and Kevin J. Stephen: A re-evaluation of Middle and Upper Jurassic stratigraphy and the flooding history of the Moray Firth Rift System, North Sea / Geological Society, London, Special Publications, 114:81-108, doi:10.1144/GSL.SP.1996.114.01.04 --- S. D. Harker and M. Rieuf: Genetic stratigraphy and sandstone distribution of the Moray Firth Humber Group (Upper Jurassic) / Geological Society, London, Special Publications, 114:109-130, doi:10.1144/GSL.SP.1996.114.01.05 --- Claire R. Hallsworth, Andrew C. Morton, and Graham Dore: Contrasting mineralogy of Upper Jurassic sandstones in the Outer Moray Firth, North Sea: implications for the evolution of sediment dispersal patterns / Geological Society, London, Special Publications, 114:131-144, doi:10.1144/GSL.SP.1996.114.01.06 --- R. E. Frost and J. F. Rose: Tectonic quiescence punctuated by strike-slip movement: influences on Late Jurassic sedimentation in the Moray Firth and the North Sea region / Geological Society, London, Special Publications, 114:145-162, doi:10.1144/GSL.SP.1996.114.01.07 --- M. A. Martin, J. E. Pollard, and M. A. Martin: The role of trace fossil (ichnofabric) analysis in the development of depositional models for the Upper Jurassic Fulmar Formation of the Kittiwake Field (Quadrant 21 UKCS) / Geological Society, London, Special Publications, 114:163-183, doi:10.1144/GSL.SP.1996.114.01.08 --- Stuart Gowland: Facies characteristics and depositional models of highly bioturbated shallow marine siliciclastic strata: an example from the Fulmar Formation (Late Jurassic), UK Central Graben / Geological Society, London, Special Publications, 114:185-214, doi:10.1144/GSL.SP.1996.114.01.09 --- S. J. C. Cannon and S. Gowland: Facies controls on reservoir quality in the Late Jurassic Fulmar Formation, Quadrant 21, UKCS / Geological Society, London, Special Publications, 114:215-233, doi:10.1144/GSL.SP.1996.114.01.10 --- Geoff Freer, Andrew Hurst, and Paul Middleton: Upper Jurassic sandstone reservoir quality and distribution on the Fladen Ground Spur / Geological Society, London, Special Publications, 114:235-249, doi:10.1144/GSL.SP.1996.114.01.11 --- C. Y. McCants and S. D. Burley: Reservoir architecture and diagenesis in downthrown fault block plays: the Lowlander Prospect of Block 14/20b, Witch Ground Graben, Outer Moray Firth, UK North Sea / Geological Society, London, Special Publications, 114:251-285, doi:10.1144/GSL.SP.1996.114.01.12 --- Michael J. Pearson, Alasdair D. Duncan, and Alasdair D. Duncan: Biomarker maturity profiles in the Inner Moray Firth Basin and implications for inversion estimates / Geological Society, London, Special Publications, 114:287-298, doi:10.1144/GSL.SP.1996.114.01.13 --- B. Dickinson: The Puffin Field: the appraisal of a complex HP-HT gas-condensate accumulation / Geological Society, London, Special Publications, 114:299-327, doi:10.1144/GSL.SP.1996.114.01.14 --- Susan Currie: The development of the Ivanhoe, Rob Roy and Hamish Fields, Block 15/21A, UK North Sea / Geological Society, London, Special Publications, 114:329-341, doi:10.1144/GSL.SP.1996.114.01.15
    Seiten: Online-Ressource (350 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1897799705
    Sprache: Englisch
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  • 7
    Schlagwort(e): Geochemie ; Umweltgeochemie ; Entwicklungsländer
    Beschreibung / Inhaltsverzeichnis: C. F. Mills: Geochemical aspects of the aetiology of trace element related diseases / Geological Society, London, Special Publications, 113:1-5, doi:10.1144/GSL.SP.1996.113.01.01 --- J. A. Plant, J. W. Baldock, and B. Smith: The role of geochemistry in environmental and epidemiological studies in developing countries: a review / Geological Society, London, Special Publications, 113:7-22, doi:10.1144/GSL.SP.1996.113.01.02 --- F. M. Fordyce, D. Masara, and J. D. Appleton: Stream sediment, soil and forage chemistry as indicators of cattle mineral status in northeast Zimbabwe / Geological Society, London, Special Publications, 113:23-37, doi:10.1144/GSL.SP.1996.113.01.03 --- I. O. Jumba, N. F. Suttle, E. A. Hunter, and S. O. Wandiga: Effects of botanical composition, soil origin and composition on mineral concentrations in dry season pastures in western Kenya / Geological Society, London, Special Publications, 113:39-45, doi:10.1144/GSL.SP.1996.113.01.04 --- John Maskall and Iain Thornton: The distribution of trace and major elements in Kenyan soil profiles and implications for wildlife nutrition / Geological Society, London, Special Publications, 113:47-62, doi:10.1144/GSL.SP.1996.113.01.05 --- R. J. Bowell, A. Warren, and I. Redmond: Formation of cave salts and utilization by elephants in the Mount Elgon region, Kenya / Geological Society, London, Special Publications, 113:63-79, doi:10.1144/GSL.SP.1996.113.01.06 --- O. Selinus, A. Frank, and V. Galgan: Biogeochemistry and metal biology / Geological Society, London, Special Publications, 113:81-89, doi:10.1144/GSL.SP.1996.113.01.07 --- W. M. Edmunds and P. L. Smedley: Groundwater geochemistry and health: an overview / Geological Society, London, Special Publications, 113:91-105, doi:10.1144/GSL.SP.1996.113.01.08 --- R. J. Bowell, S. McEldowney, A. Warren, B. Mathew, and M. Bwankuzo: Biogeochemical factors affecting groundwater quality in central Tanzania / Geological Society, London, Special Publications, 113:107-130, doi:10.1144/GSL.SP.1996.113.01.09 --- C. B. Dissanayake: Water quality and dental health in the Dry Zone of Sri Lanka / Geological Society, London, Special Publications, 113:131-140, doi:10.1144/GSL.SP.1996.113.01.10 --- B. Smith, N. Breward, M. B. Crawford, D. Galimaka, S. M. Mushiri, and S. Reeder: The environmental geochemistry of aluminium in tropical terrains and its implications to health / Geological Society, London, Special Publications, 113:141-152, doi:10.1144/GSL.SP.1996.113.01.11 --- Iain Thornton: Sources and pathways of arsenic in the geochemical environment: health implications / Geological Society, London, Special Publications, 113:153-161, doi:10.1144/GSL.SP.1996.113.01.12 --- P. L. Smedley, W. M. Edmunds, and K. B. Pelig-Ba: Mobility of arsenic in groundwater in the Obuasi gold-mining area of Ghana: some implications for human health / Geological Society, London, Special Publications, 113:163-181, doi:10.1144/GSL.SP.1996.113.01.13 --- E. Helios Rybicka: Environmental impact of mining and smelting industries in Poland / Geological Society, London, Special Publications, 113:183-193, doi:10.1144/GSL.SP.1996.113.01.14 --- Keith Nicholson: Lacustrine sediment geochemistry as a tool in retrospective environmental impact assessment of mining and urban development in tropical environments: examples from Papua New Guinea / Geological Society, London, Special Publications, 113:195-199, doi:10.1144/GSL.SP.1996.113.01.15 --- Ron Fuge: Geochemistry of iodine in relation to iodine deficiency diseases / Geological Society, London, Special Publications, 113:201-211, doi:10.1144/GSL.SP.1996.113.01.16 --- C. B. Dissanayake and R. L. R. Chandrajith: Iodine in the environment and endemic goitre in Sri Lanka / Geological Society, London, Special Publications, 113:213-221, doi:10.1144/GSL.SP.1996.113.01.17 --- A. G. Stewart and P. O. D. Pharoah: Clinical and epidemiological correlates of iodine deficiency disorders / Geological Society, London, Special Publications, 113:223-230, doi:10.1144/GSL.SP.1996.113.01.18 --- M. G. Nair, S. M. Maxwell, and B. J. Brabin: The protective role of trace elements in preventing aflatoxin induced damage: a review / Geological Society, London, Special Publications, 113:231-237, doi:10.1144/GSL.SP.1996.113.01.19 --- R. A. Nicholson, P. D. Roberts, and P. J. Baxter: Preliminary studies of acid and gas contamination at Poas volcano, Costa Rica / Geological Society, London, Special Publications, 113:239-244, doi:10.1144/GSL.SP.1996.113.01.20 --- M. A. Oliver: Kriging: a method of estimation for environmental and rare disease data / Geological Society, London, Special Publications, 113:245-254, doi:10.1144/GSL.SP.1996.113.01.21 --- R. Harvey, J. J. Powell, and R. P. H. Thompson: A review of the geochemical factors linked to podoconiosis / Geological Society, London, Special Publications, 113:255-260, doi:10.1144/GSL.SP.1996.113.01.22
    Seiten: Online-Ressource (VIII, 264 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1897799640
    Sprache: Englisch
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  • 8
    Unbekannt
    London : The Geological Society
    Schlagwort(e): Atlantischer Raum Nord ; Präkambrium ; Erdkruste ; Crosta da terra (evolução) ; Crust ; Earth ; Earth - Crust - Congresses ; Geology ; Geology, Stratigraphic ; Géologie - Atlantique Nord (région) ; Lithosphère ; North Atlantic Region ; Precambrian ; Pré-cambriano - Oceano atlântico;região norte ; Précambrien
    Beschreibung / Inhaltsverzeichnis: D. B. Snyder, S. B. Lucas, and J. H. McBride: Crustal and mantle reflectors from Palaeoproterozoic orogens and their relation to arc-continent collisions / Geological Society, London, Special Publications, 112:1-23, doi:10.1144/GSL.SP.1996.112.01.01 --- H. R. Rollinson: Tonalite-trondhjemite-granodiorite magmatism and the genesis of Lewisian crust during the Archaean / Geological Society, London, Special Publications, 112:25-42, doi:10.1144/GSL.SP.1996.112.01.02 --- A. Vrevsky, R. Krimsky, and S. Svetov: Rare earth and isotopic (Nd, O) heterogeneity of the Archaean mantle, Baltic Shield / Geological Society, London, Special Publications, 112:43-53, doi:10.1144/GSL.SP.1996.112.01.03 --- E. V. Bibikova, T. Skiöld, and S. V. Bogdanova: Age and geodynamic aspects of the oldest rocks in the Precambrian Belomorian Belt of the Baltic (Fennoscandian) Shield / Geological Society, London, Special Publications, 112:55-67, doi:10.1144/GSL.SP.1996.112.01.04 --- S. V. Bogdanova: High-grade metamorphism of 2.45–2.4 Ga age in mafic intrusions of the Belomorian Belt in the northeastern Baltic Shield / Geological Society, London, Special Publications, 112:69-90, doi:10.1144/GSL.SP.1996.112.01.05 --- Martin J. Van Kranendonk and Richard J. Wardle: Burwell domain of the Palaeoproterozoic Torngat Orogen, northeastern Canada: tilted cross-section of a magmatic are caught between a rock and a hard place / Geological Society, London, Special Publications, 112:91-115, doi:10.1144/GSL.SP.1996.112.01.06 --- Toby Rivers, Flemming Mengel, David J. Scott, Lisa M. Campbell, and Normand Goulet: Torngat Orogen — a Palaeoproterozoic example of a narrow doubly vergent collisional orogen / Geological Society, London, Special Publications, 112:117-136, doi:10.1144/GSL.SP.1996.112.01.07 --- R. J. Wardle and M. J. Van Kranendonk: The Palaeoproterozoic Southeastern Churchill Province of Labrador-Quebec, Canada: orogenic development as a consequence of oblique collision and indentation / Geological Society, London, Special Publications, 112:137-153, doi:10.1144/GSL.SP.1996.112.01.08 --- Andrew Kerr, Bruce Ryan, Charles F. Gower, Richard J. Wardle, and Andrew Kerr: The Makkovik Province: extension of the Ketilidian Mobile Belt in mainland North America / Geological Society, London, Special Publications, 112:155-177, doi:10.1144/GSL.SP.1996.112.01.09 --- B. Chadwick and A. A. Garde: Palaeoproterozoic oblique plate convergence in South Greenland: a reappraisal of the Ketilidian Orogen / Geological Society, London, Special Publications, 112:179-196, doi:10.1144/GSL.SP.1996.112.01.10 --- Charles F. Gower: The evolution of the Grenville Province in eastern Labrador, Canada / Geological Society, London, Special Publications, 112:197-218, doi:10.1144/GSL.SP.1996.112.01.11 --- Ian C. Starmer: Accretion, rifting, rotation and collision in the North Atlantic supercontinent, 1700-950 Ma / Geological Society, London, Special Publications, 112:219-248, doi:10.1144/GSL.SP.1996.112.01.12 --- A. Wikström, T. Skiöld, and B. Öhlander: The relationship between 1.88 Ga old magmatism and the Baltic-Bothnian shear zone in northern Sweden / Geological Society, London, Special Publications, 112:249-259, doi:10.1144/GSL.SP.1996.112.01.13 --- J. N. Connelly and K-I. Åhäll: The Mesoproterozoic cratonization of Baltica — new age constraints from SW Sweden / Geological Society, London, Special Publications, 112:261-273, doi:10.1144/GSL.SP.1996.112.01.14 --- J. F. Menuge and T. S. Brewer: Mesoproterozoic anorogenic magmatism in southern Norway / Geological Society, London, Special Publications, 112:275-295, doi:10.1144/GSL.SP.1996.112.01.15 --- J. N. Connelly, J. Berglund, and S. Å. Larson: Thermotectonic evolution of the Eastern Segment of southwestern Sweden: tectonic constraints from U-Pb geochronology / Geological Society, London, Special Publications, 112:297-313, doi:10.1144/GSL.SP.1996.112.01.16 --- Laurence M. Page, Michael B. Stephens, and Carl-Henric Wahlgren: 40Ar/39Ar geochronological constraints on the tectonothermal evolution of the Eastern Segment of the Sveconorwegian Orogen, south-central Sweden / Geological Society, London, Special Publications, 112:315-330, doi:10.1144/GSL.SP.1996.112.01.17 --- S. Mertanen, L. J. Pesonen, and H. Huhma: Palaeomagnetism and Sm-Nd ages of the Neoproterozoic diabase dykes in Laanila and Kautokeino, northern Fennoscandia / Geological Society, London, Special Publications, 112:331-358, doi:10.1144/GSL.SP.1996.112.01.18 --- Trevor F. Emmett: The provenance of pre-Scandian continental flakes within the Caledonide Orogen of south-central Norway / Geological Society, London, Special Publications, 112:359-366, doi:10.1144/GSL.SP.1996.112.01.19 --- W. R. Fitches, N. J. G. Pearce, J. A. Evans, and R. J. Muir: Provenance of late Proterozoic Dalradian tillite clasts, Inner Hebrides, Scotland / Geological Society, London, Special Publications, 112:367-377, doi:10.1144/GSL.SP.1996.112.01.20
    Seiten: Online-Ressource (VII, 386 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1897799624
    Sprache: Englisch
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  • 9
    Unbekannt
    London : The Geological Society
    Schlagwort(e): Methan ; Kohle ; Kohlengeologie ; Kohlenlagerstätte ; Methanlagerstätte ; fossile Brennstoffe ; Coalbed methane ; Coal / Geology
    Beschreibung / Inhaltsverzeichnis: Coalbed Methane Resources in USA and Europe --- D. Keith Murray: Coalbed methane in the USA: analogues for worldwide development / Geological Society, London, Special Publications, 109:1-12, doi:10.1144/GSL.SP.1996.109.01.01 --- Thomas G. Fails: Coalbed methane potential of some Variscan foredeep basins / Geological Society, London, Special Publications, 109:13-26, doi:10.1144/GSL.SP.1996.109.01.02 --- F. J. MacCarthy, R. M. Tisdale, and W. B. Ayers, Jr: Geological controls on coalbed prospectivity in part of the North Staffordshire Coalfield, UK / Geological Society, London, Special Publications, 109:27-42, doi:10.1144/GSL.SP.1996.109.01.03 --- J. L. Knight, B. J. Shevlin, D. C. Edgar, and P. Dolan: Coal thickness distributions on the UK continental shelf / Geological Society, London, Special Publications, 109:43-57, doi:10.1144/GSL.SP.1996.109.01.04 --- Dierk Juch: Assessment of West German hardcoal resources and its relation to coalbed methane / Geological Society, London, Special Publications, 109:59-65, doi:10.1144/GSL.SP.1996.109.01.05 --- U. Freudenberg, S. Lou, R. Schlüter, K. Schütz, and K. Thomas: Main factors controlling coalbed methane distribution in the Ruhr District, Germany / Geological Society, London, Special Publications, 109:67-88, doi:10.1144/GSL.SP.1996.109.01.06 --- James S. Marshall, Raymond C. Pilcher, and Carol J. Bibler: Opportunities for the development and utilization of coalbed methane in three coal basins in Russia and Ukraine / Geological Society, London, Special Publications, 109:89-101, doi:10.1144/GSL.SP.1996.109.01.07 --- Coal as a Reservoir --- R. A. Gayer, J. Pešek, I. Sýkorová, and P. Valterová: Coal clasts in the upper Westphalian sequence of the South Wales coal basin: implications for the timing of maturation and fracture permeability / Geological Society, London, Special Publications, 109:103-120, doi:10.1144/GSL.SP.1996.109.01.08 --- T. M. Hathaway and R. A. Gayer: Thrust-related permeability in the South Wales Coalfield / Geological Society, London, Special Publications, 109:121-132, doi:10.1144/GSL.SP.1996.109.01.09 --- C. I. Pattison, C. R. Fielding, R. H. McWatters, and L. H. Hamilton: Nature and origin of fractures in Permian coals from the Bowen Basin, Queensland, Australia / Geological Society, London, Special Publications, 109:133-150, doi:10.1144/GSL.SP.1996.109.01.10 --- Basim S. M. Faraj, Chris R. Fielding, and Ian D. R. Mackinnon: Cleat mineralization of Upper Permian Baralaba/Rangal Coal Measures, Bowen Basin, Australia / Geological Society, London, Special Publications, 109:151-164, doi:10.1144/GSL.SP.1996.109.01.11 --- Paul Gamson, Basil Beamish, and David Johnson: Coal microstructure and secondary mineralization: their effect on methane recovery / Geological Society, London, Special Publications, 109:165-179, doi:10.1144/GSL.SP.1996.109.01.12 --- Ian H. Harris, Gareth A. Davies, Rodney A. Gayer, and Keith Williams: Enhanced methane desorption characteristics from South Wales anthracites affected by tectonically induced fracture sets / Geological Society, London, Special Publications, 109:181-196, doi:10.1144/GSL.SP.1996.109.01.13 --- Jeffrey R. Levine: Model study of the influence of matrix shrinkage on absolute permeability of coal bed reservoirs / Geological Society, London, Special Publications, 109:197-212, doi:10.1144/GSL.SP.1996.109.01.14 --- M. I. Davidson, R. Bryant, and D. J. A. Williams: Characterization of anthracite / Geological Society, London, Special Publications, 109:213-225, doi:10.1144/GSL.SP.1996.109.01.15 --- Pavel Konečhný and Alena Kožušníková: Measurement of gas permeability of coal and clastic sedimentary rocks under triaxial stress conditions / Geological Society, London, Special Publications, 109:227-229, doi:10.1144/GSL.SP.1996.109.01.16 --- A. Kožušníková: Relationship between the hydrogen content of coal and the lithological characteristics of rocks overlying the coal seam / Geological Society, London, Special Publications, 109:231-236, doi:10.1144/GSL.SP.1996.109.01.17 --- Coal Geological Studies Related to Coalbed Methane --- Edward Lester, Martin Allen, Michael Cloke, and Brian Atkin: Analysis of the problems associated with the use of image analysis for microlithotype analysis on solid coal mounts / Geological Society, London, Special Publications, 109:237-248, doi:10.1144/GSL.SP.1996.109.01.18 --- I. Sýkorová, M. Novotná, H. Pavlíková, and V. Machovič: Petrological and spectroscopic structural characteristics of Bohemian and Moravian coals and their possible relation to gas proneness / Geological Society, London, Special Publications, 109:249-260, doi:10.1144/GSL.SP.1996.109.01.19 --- Grzegorz J. Nowak: Petrological coal seam accumulation model for the Zacler Formation of the Lower Silesian coal basin, southwestern Poland / Geological Society, London, Special Publications, 109:261-286, doi:10.1144/GSL.SP.1996.109.01.20 --- J. Barraza, A. Gilfillan, M. Cloke, and D. Clift: Minerals and major elements in density-separated coal fractions from Point of Ayr coal, Wales, UK / Geological Society, London, Special Publications, 109:287-299, doi:10.1144/GSL.SP.1996.109.01.21 --- Irena Kostova, Ognyan Petrov, and Jordan Kortenski: Mineralogy, geochemistry and pyrite content of Bulgarian subbituminous coals, Pernik Basin / Geological Society, London, Special Publications, 109:301-314, doi:10.1144/GSL.SP.1996.109.01.22 --- Duncan McLean and Iain Murray: Subsurface correlation of Carboniferous coal seams and inter-seam sediments using palynology: application to exploration for coalbed methane / Geological Society, London, Special Publications, 109:315-324, doi:10.1144/GSL.SP.1996.109.01.23 --- A. I. Karayigit, E. Eris, and E. Cicioglu: Coal geology, chemical and petrographical characteristics, and implications for coalbed methane development of subbituminous coals from the Sorgun and Suluova Eocene basins, Turkey / Geological Society, London, Special Publications, 109:325-338, doi:10.1144/GSL.SP.1996.109.01.24
    Seiten: Online-Ressource (VIII, 344 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 189779956X
    Sprache: Englisch
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Unbekannt
    Berlin ; Heidelberg : Springer
    Beschreibung / Inhaltsverzeichnis: PREFACE The objective of this book is to introduce the practitioner as well as the more theoretically interested reader into the integration problem of spatial information for Geo-lnformation Syslems. Former Get-Information Systems are restricted to 2D space. They realize the integration of spatial information by a conversion of vector and raster representations. This, however. leads to conceptual difficulties because of the two totally different paradigms. Furthermore, the internal topology of the get-objects is not considered. In recent years the processing of 3D information has played a growing role in Get-Information Systems. For example, planning processes for environmental protection or city planning are dependent on 3D data. The integration of spatial reformation will become even more impoaant in the 3D context and with the development of a new generation of open GISs. This book is intended to respond to some of these requirements. It presents a model for the integration of spatial information for 3D Geo-lnformation Systems (3D-GISs). As a precondition for the integration of spatial information, the integration of different spatial representations is emphasized. The model is based on a three-level notion of space that likewise includes the geometry, metrics and the topology of get-objects. The so called extended complex (e-complex) is introduced as a kernel of the model. Its internal basic geometries are the point, the line, the triangle and the tetrahedron. It is shown how a convex e-complex (ce-complex) is generated by the construction of the convex hull and the "'filling" of lines, triangles and tetrahedra, respectively. As we know from computer geometry, this results in substantially simpler geometric algorithms. Additionally, the algorithms gain by the explicit utilization of the topology of the ce-complex. This book also builds a bridge from the GIS to the object-oriented database technology, which will likely become a key technology for the development of a new generation of open Geo-lnformation Systems. In the so-called GEtmodel kernel "building blocks" are introduced that s~mplify the development of software architectures for geo-applications. A geological application in the Lower Rhine Basin shows the practical use of the introduced geometric and topological representation for a 3D-GIS...
    Seiten: Online-Ressource (171 Seiten)
    ISBN: 9783540608561
    Sprache: Englisch
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  • 11
    Schlagwort(e): Geologie ; Mittelozeanischer Rücken ; Deep-sea ecology ; Hydrothermal vents ; Magmatism ; Mid-ocean ridges ; Sea-floor spreading ; Submarine geology
    Beschreibung / Inhaltsverzeichnis: Jean-Christophe Sempéré, Brian P. West, and Louis Géli: The Southeast Indian Ridge between 127° and 132°40′E: contrasts in segmentation characteristics and implications for crustal accretion / Geological Society, London, Special Publications, 118:1-15, doi:10.1144/GSL.SP.1996.118.01.01 --- Philippe Blondel: Segmentation of the Mid-Atlantic Ridge south of the Azores, based on acoustic classification of TOBI data / Geological Society, London, Special Publications, 118:17-28, doi:10.1144/GSL.SP.1996.118.01.02 --- Eddie McAllister and Johnson R. Cann: Initiation and evolution of boundary-wall faults along the Mid-Atlantic Ridge, 25–29°N / Geological Society, London, Special Publications, 118:29-48, doi:10.1144/GSL.SP.1996.118.01.03 --- Simon Allerton, Roger C. Searle, and Bramley J. Murton: Bathymetric segmentation and faulting on the Mid-Atlantic Ridge, 24°00′N to 24°40′N / Geological Society, London, Special Publications, 118:49-60, doi:10.1144/GSL.SP.1996.118.01.04 --- Kate Lawson, Roger C. Searle, Julian A. Pearce, Paul Browning, and Pamela Kempton: Detailed volcanic geology of the MARNOK area, Mid-Atlantic Ridge north of Kane transform / Geological Society, London, Special Publications, 118:61-102, doi:10.1144/GSL.SP.1996.118.01.05 --- Rodey Batiza: Magmatic segmentation of mid-ocean ridges: a review / Geological Society, London, Special Publications, 118:103-130, doi:10.1144/GSL.SP.1996.118.01.06 --- C. J. Robinson, R. S. White, M. J. Bickle, and T. A. Minshull: Restricted melting under the very slow-spreading Southwest Indian ridge / Geological Society, London, Special Publications, 118:131-141, doi:10.1144/GSL.SP.1996.118.01.07 --- Stephen J. Edwards, Trevor J. Falloon, John Malpas, and Rolf B. Pedersen: A review of the petrology of harzburgites at Hess Deep and Garrett Deep: implications for mantle processes beneath segments of the East Pacific Rise / Geological Society, London, Special Publications, 118:143-156, doi:10.1144/GSL.SP.1996.118.01.08 --- Rachel M. Haymon: The response of ridge-crest hydrothermal systems to segmented, episodic magma supply / Geological Society, London, Special Publications, 118:157-168, doi:10.1144/GSL.SP.1996.118.01.09 --- C. R. German, L. M. Parson, B. J. Murton, and H. D. Needham: Hydrothermal activity and ridge segmentation on the Mid-Atlantic Ridge: a tale of two hot-spots? / Geological Society, London, Special Publications, 118:169-184, doi:10.1144/GSL.SP.1996.118.01.10 --- C. J. MacLeod and C. E. Manning: Influence of axial segmentation on hydrothermal circulation at fast-spreading ridges: insights from Hess Deep / Geological Society, London, Special Publications, 118:185-198, doi:10.1144/GSL.SP.1996.118.01.11 --- V. V. Zaykov, V. V. Maslennikov, E. V. Zaykova, and R. J. Herrington: Hydrothermal activity and segmentation in the Magnitogorsk-West Mugodjarian zone on the margins of the Urals palaeo-ocean / Geological Society, London, Special Publications, 118:199-210, doi:10.1144/GSL.SP.1996.118.01.12 --- Eve C. Southward, Verena Tunnicliffe, Michael B. Black, David R. Dixon, and Linda R.J. Dixon: Ocean-ridge segmentation and vent tubeworms (Vestimentifera) in the NE Pacific / Geological Society, London, Special Publications, 118:211-224, doi:10.1144/GSL.SP.1996.118.01.13 --- Verena Tunnicliffe, C. Mary R. Fowler, and Andrew G. Mcarthur: Plate tectonic history and hot vent biogeography / Geological Society, London, Special Publications, 118:225-238, doi:10.1144/GSL.SP.1996.118.01.14 --- E. G. Nisbet and C. M. R. Fowler: The hydrothermal imprint on life: did heat-shock proteins, metalloproteins and photosynthesis begin around hydrothermal vents? / Geological Society, London, Special Publications, 118:239-251, doi:10.1144/GSL.SP.1996.118.01.15
    Seiten: Online-Ressource (IX, 258 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1897799721
    Sprache: Englisch
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  • 12
    Unbekannt
    London : The Geological Society
    Schlagwort(e): Schelf ; Siliziklastisches Gestein ; Coasts ; Continental shelf ; Marine sediments ; Submarine geology
    Beschreibung / Inhaltsverzeichnis: Stratigraphy and Sedimentary Geology of Siliciclastic Shelves --- O. Michelsen and M. Danielsen: Sequence and systems tract interpretation of the epicontinental Oligocene deposits in the Danish North Sea / Geological Society, London, Special Publications, 117:1-13, doi:10.1144/GSL.SP.1996.117.01.01 --- P. B. Konradi: Foraminiferal biostratigraphy of the post-mid-Miocene in the Danish Central Trough, North Sea / Geological Society, London, Special Publications, 117:15-22, doi:10.1144/GSL.SP.1996.117.01.02 --- P. Jacobs and M. De Batist: Sequence stratigraphy and architecture on a ramp-type continental shelf: the Belgian Palaeogene / Geological Society, London, Special Publications, 117:23-48, doi:10.1144/GSL.SP.1996.117.01.03 --- D. Mellere and R. J. Steel: Tidal sedimentation in Inner Hebrides half grabens, Scotland: the Mid-Jurassic Bearreraig Sandstone Formation / Geological Society, London, Special Publications, 117:49-79, doi:10.1144/GSL.SP.1996.117.01.04 --- L. A. Spalletti: Estuarine and shallow-marine sedimentation in the Upper Cretaceous-Lower Tertiary west-central Patagonian Basin (Argentina) / Geological Society, London, Special Publications, 117:81-93, doi:10.1144/GSL.SP.1996.117.01.05 --- Modern siliciclastic Shelves: Architecture, Sea Level, Tectonics and Sediment Supply --- J. B. Anderson, K. Abdulah, S. Sarzalejo, F. Siringan, and M. A. Thomas: Late Quaternary sedimentation and high-resolution sequence stratigraphy of the east Texas shelf / Geological Society, London, Special Publications, 117:95-124, doi:10.1144/GSL.SP.1996.117.01.06 --- G. Ercilla and B. Alonso: Quaternary siliciclastic sequence stratigraphy of western Mediterranean passive and tectonically active margins: the role of global versus local controlling factors / Geological Society, London, Special Publications, 117:125-137, doi:10.1144/GSL.SP.1996.117.01.07 --- F. J. Hernández-Molina, L. Somoza, and J. Rey: Late Pleistocene-Holocene high-resolution sequence analysis on the Alboran Sea continental shelf / Geological Society, London, Special Publications, 117:139-154, doi:10.1144/GSL.SP.1996.117.01.08 --- A. Correggiari, M. E. Field, and F. Trincardi: Late Quaternary transgressive large dunes on the sediment-starved Adriatic shelf / Geological Society, London, Special Publications, 117:155-169, doi:10.1144/GSL.SP.1996.117.01.09 --- P. J. Bart and J. B. Anderson: Seismic expression of depositional sequences associated with expansion and contraction of ice sheets on the northwestern Antarctic Peninsula continental shelf / Geological Society, London, Special Publications, 117:171-186, doi:10.1144/GSL.SP.1996.117.01.10 --- H. P. Sejrup, E. L. King, I. Aarseth, H. Haflidason, and A. Elverhøi: Quaternary erosion and depositional processes: western Norwegian fjords, Norwegian Channel and North Sea Fan / Geological Society, London, Special Publications, 117:187-202, doi:10.1144/GSL.SP.1996.117.01.11 --- G. Lericolais, P. Guennoc, J.-P. Auffret, J.-F. Bourillet, and S. Berne: Detailed survey of the western end of the Hurd Deep (English Channel): new facts for a tectonic origin / Geological Society, London, Special Publications, 117:203-215, doi:10.1144/GSL.SP.1996.117.01.12 --- Nearshore and Coastal Environments --- J. M. L. Dominguez: The São Francisco strandplain: a paradigm for wave-dominated deltas? / Geological Society, London, Special Publications, 117:217-231, doi:10.1144/GSL.SP.1996.117.01.13 --- J. V. Barrie and K. W. Conway: Evolution of a nearshore and coastal macrotidal sand transport system, Queen Charlotte Islands, Canada / Geological Society, London, Special Publications, 117:233-247, doi:10.1144/GSL.SP.1996.117.01.14 --- W. J. Cleary, S. R. Riggs, D. C. Marcy, and S. W. Snyder: The influence of inherited geological framework upon a hardbottom-dominated shoreface on a high-energy shelf: Onslow Bay, North Carolina, USA / Geological Society, London, Special Publications, 117:249-266, doi:10.1144/GSL.SP.1996.117.01.15 --- V. Eitner, R. Kaiser, H. D. Niemeyer, and V. Eitner: Nearshore sediment transport processes due to moderate hydrodynamic conditions / Geological Society, London, Special Publications, 117:267-288, doi:10.1144/GSL.SP.1996.117.01.16 --- New Techniques in Continental Shelf Research --- R. J. De Meijer, I. C. Tánczos, and C. Stapel: Radiometry as a technique for use in coastal research / Geological Society, London, Special Publications, 117:289-297, doi:10.1144/GSL.SP.1996.117.01.17 --- T. Missiaen, T. M. McGee, D. Pearks, G. Ollier, and F. Theilen: An interdisciplinary approach to the evaluation of physical parameters of shallow marine sediments / Geological Society, London, Special Publications, 117:299-322, doi:10.1144/GSL.SP.1996.117.01.18 --- A. M. Davis: Geophysics in offshore site investigation: a review of the state of the art / Geological Society, London, Special Publications, 117:323-338, doi:10.1144/GSL.SP.1996.117.01.19
    Seiten: Online-Ressource (VIII, 345 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1897799713
    Sprache: Englisch
    Standort Signatur Erwartet Verfügbarkeit
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  • 13
    Unbekannt
    London : The Geological Society
    Schlagwort(e): Nordwesteuropa ; Paläogen ; Stratigraphie ; Tertiär ; Geology, Stratigraphic ; Paleogene ; Geology / Europe, Western ; Stratigraphy ; Western Europe
    Beschreibung / Inhaltsverzeichnis: R. W. O’B. Knox: Correlation of the early Paleogene in northwest Europe: an overview / Geological Society, London, Special Publications, 101:1-11, doi:10.1144/GSL.SP.1996.101.01.01 --- Regional Studies: Stratigraphy, Tectonics and Volcanism --- J. E. Neal: A summary of Paleogene sequence stratigraphy in northwest Europe and the North Sea / Geological Society, London, Special Publications, 101:15-42, doi:10.1144/GSL.SP.1996.101.01.02 --- P. A. Nadin and N. J. Kusznir: Forward and reverse stratigraphic modelling of Cretaceous-Tertiary post-rift subsidence and Paleogene uplift in the Outer Moray Firth Basin, central North Sea / Geological Society, London, Special Publications, 101:43-62, doi:10.1144/GSL.SP.1996.101.01.03 --- J. D. Ritchie and K. Hitchen: Early Paleogene offshore igneous activity to the northwest of the UK and its relationship to the North Atlantic Igneous Province / Geological Society, London, Special Publications, 101:63-78, doi:10.1144/GSL.SP.1996.101.01.04 --- Aidan M. Joy: Controls on Eocene sedimentation in the central North Sea Basin: results of a basinwide correlation study / Geological Society, London, Special Publications, 101:79-90, doi:10.1144/GSL.SP.1996.101.01.05 --- David C. Mudge and Jonathan P. Bujak: An integrated stratigraphy for the Paleocene and Eocene of the North Sea / Geological Society, London, Special Publications, 101:91-113, doi:10.1144/GSL.SP.1996.101.01.06 --- J. E. Thomas: The occurrence of the dinoflagellate cyst Apectodinium (Costa & Downie 1976) Lentin & Williams 1977 in the Moray and Montrose Groups (Danian to Thanetian) of the UK central North Sea / Geological Society, London, Special Publications, 101:115-120, doi:10.1144/GSL.SP.1996.101.01.07 --- Susan E. Wood and Richard V. Tyson: An integrated palynological-palynofacies approach to the zonation of the Paleogene in the Forties-Montrose Ridge area, central North Sea / Geological Society, London, Special Publications, 101:121-128, doi:10.1144/GSL.SP.1996.101.01.08 --- Jason R. Ali and David W. Jolley: Chronostratigraphic framework for the Thanetian and lower Ypresian deposits of southern England / Geological Society, London, Special Publications, 101:129-144, doi:10.1144/GSL.SP.1996.101.01.09 --- A. J. Powell, H. Brinkhuis, and J. P. Bujak: Upper Paleocene-Lower Eocene dinoflagellate cyst sequence biostratigraphy of southeast England / Geological Society, London, Special Publications, 101:145-183, doi:10.1144/GSL.SP.1996.101.01.10 --- Richard A. Ellison, Jason R. Ali, Nicolette M. Hine, and David W. Jolley: Recognition of Chron C25n in the upper Paleocene Upnor Formation of the London Basin, UK / Geological Society, London, Special Publications, 101:185-193, doi:10.1144/GSL.SP.1996.101.01.11 --- J. R. Ali, E. A. Hailwood, and C. King: The ‘Oldhaven magnetozone’ in East Anglia: a revised interpretation / Geological Society, London, Special Publications, 101:195-203, doi:10.1144/GSL.SP.1996.101.01.12 --- J. J. Hooker: Mammalian biostratigraphy across the Paleocene-Eocene boundary in the Paris, London and Belgian basins / Geological Society, London, Special Publications, 101:205-218, doi:10.1144/GSL.SP.1996.101.01.13 --- David W. Jolley: The earliest Eocene sediments of eastern England: an ultra-high resolution palynological correlation / Geological Society, London, Special Publications, 101:219-254, doi:10.1144/GSL.SP.1996.101.01.14 --- Alexander G. Mitlehner: Palaeoenvironments in the North Sea Basin around the Paleocene-Eocene boundary: evidence from diatoms and other siliceous microfossils / Geological Society, London, Special Publications, 101:255-273, doi:10.1144/GSL.SP.1996.101.01.15 --- B. Schmitz, C. Heilmann-Clausen, C. King, E. Steurbaut, F. P. Andreasson, R. M. Corfield, and J. E. Cartlidge: Stable isotope and biotic evolution in the North Sea during the early Eocene: the Albæk Hoved section, Denmark / Geological Society, London, Special Publications, 101:275-306, doi:10.1144/GSL.SP.1996.101.01.16 --- Global Perspective: Geochronology and the Oceanic Record --- W. A. Berggren and M.-P. Aubry: A late Paleocene-early Eocene NW European and North Sea magnetobiochronological correlation network / Geological Society, London, Special Publications, 101:309-352, doi:10.1144/GSL.SP.1996.101.01.17 --- Marie-Pierre Aubry, William A. Berggren, Lowell Stott, and Ashish Sinha: The upper Paleocene-lower Eocene stratigraphic record and the Paleocene-Eocene boundary carbon isotope excursion: implications for geochronology / Geological Society, London, Special Publications, 101:353-380, doi:10.1144/GSL.SP.1996.101.01.18 --- Lowell D. Stott, Ashish Sinha, Medard Thiry, Marie-Pierre Aubry, and William A. Berggren: Global δ13C changes across the Paleocene-Eocene boundary: criteria for terrestrial-marine correlations / Geological Society, London, Special Publications, 101:381-399, doi:10.1144/GSL.SP.1996.101.01.19 --- E. Thomas and N. J. Shackleton: The Paleocene-Eocene benthic foraminiferal extinction and stable isotope anomalies / Geological Society, London, Special Publications, 101:401-441, doi:10.1144/GSL.SP.1996.101.01.20 --- Richard M. Corfield and Richard D. Norris: Deep water circulation in the Paleocene Ocean / Geological Society, London, Special Publications, 101:443-456, doi:10.1144/GSL.SP.1996.101.01.21 --- Stella D. Charisi and Birger Schmitz: Early Eocene palaeoceanography and palaeoclimatology of the eastern North Atlantic: stable isotope results for DSDP Hole 550 / Geological Society, London, Special Publications, 101:457-472, doi:10.1144/GSL.SP.1996.101.01.22
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    ISBN: 1897799470
    Sprache: Englisch
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  • 14
    Unbekannt
    London : The Geological Society
    Schlagwort(e): Massenaussterben ; Paläontologie ; Regeneration ; Paläobiologie ; Paläoökologie ; Biotischer Faktor ; Extinction (Biology) ; Paleoecology
    Beschreibung / Inhaltsverzeichnis: General --- David J. Bottjer, Jennifer K. Schubert, and Mary L. Droser: Comparative evolutionary palaeoecology: assessing the changing ecology of the past / Geological Society, London, Special Publications, 102:1-13, doi:10.1144/GSL.SP.1996.001.01.01 --- Erle G. Kauffman and Peter J. Harries: The importance of crisis progenitors in recovery from mass extinction / Geological Society, London, Special Publications, 102:15-39, doi:10.1144/GSL.SP.1996.001.01.02 --- Peter J. Harries, Erle G. Kauffman, and Thor A. Hansen: Models for biotic survival following mass extinction / Geological Society, London, Special Publications, 102:41-60, doi:10.1144/GSL.SP.1996.001.01.03 --- Valentin A. Krassilov: Recovery as a function of community structure / Geological Society, London, Special Publications, 102:61-63, doi:10.1144/GSL.SP.1996.001.01.04 --- E. A. Jarzembowski and A. J. Ross: Insect origination and extinction in the Phanerozoic / Geological Society, London, Special Publications, 102:65-78, doi:10.1144/GSL.SP.1996.001.01.05 --- Palaeozoic --- Andrey Yu. Zhuravlev: Reef ecosytem recovery after the Early Cambrian extinction / Geological Society, London, Special Publications, 102:79-96, doi:10.1144/GSL.SP.1996.001.01.06 --- F. M. Swain: Ostracode speciation following Middle Ordovician extinction events, north central United States / Geological Society, London, Special Publications, 102:97-104, doi:10.1144/GSL.SP.1996.001.01.07 --- H. A. Armstrong: Biotic recovery after mass extinction: the role of climate and ocean-state in the post-glacial (Late Ordovician-Early Silurian) recovery of the conodonts / Geological Society, London, Special Publications, 102:105-117, doi:10.1144/GSL.SP.1996.001.01.08 --- William B. N. Berry: Recovery of post—Late Ordovician extinction graptolites: a western North American perspective / Geological Society, London, Special Publications, 102:119-126, doi:10.1144/GSL.SP.1996.001.01.09 --- Dimitri Kaljo: Diachronous recovery patterns in Early Silurian corals, graptolites and acritarchs / Geological Society, London, Special Publications, 102:127-133, doi:10.1144/GSL.SP.1996.001.01.10 --- Petr Čejchan and Jindřich Hladil: Searching for extinction/recovery gradients: the Frasnian-Famennian interval, Mokrá Section, Moravia, central Europe / Geological Society, London, Special Publications, 102:135-161, doi:10.1144/GSL.SP.1996.001.01.11 --- Michael R. House: Juvenile goniatite survival strategies following Devonian extinction events / Geological Society, London, Special Publications, 102:163-185, doi:10.1144/GSL.SP.1996.001.01.12 --- O. L. Kossovaya: The mid-Carboniferous rugose coral recovery / Geological Society, London, Special Publications, 102:187-199, doi:10.1144/GSL.SP.1996.001.01.13 --- William A. DiMichele and Tom L. Phillips: Climate change, plant extinctions and vegetational recovery during the Middle-Late Pennsylvanian Transition: the Case of tropical peat-forming environments in North America / Geological Society, London, Special Publications, 102:201-221, doi:10.1144/GSL.SP.1996.001.01.14 --- Mesozoic --- Douglas H. Erwin and P. Hua-Zhang: Recoveries and Radiations: Gastropods After the Permo-Triassic Mass Extinction / Geological Society, London, Special Publications, 102:223-229, doi:10.1144/GSL.SP.1996.001.01.15 --- A. Hallam: Recovery of the marine fauna in Europe after the end-Triassic and Early Toarcian mass Extinctions / Geological Society, London, Special Publications, 102:231-236, doi:10.1144/GSL.SP.1996.001.01.16 --- A. Tewari, M. B. Hart, and M. P. Watkinson: Foraminiferal recovery after the mid-Cretaceous oceanic anoxic events (OAEs) in the Cauvery Basin, southeast India / Geological Society, London, Special Publications, 102:237-244, doi:10.1144/GSL.SP.1996.001.01.17 --- Danuta Peryt and Marcos Lamolda: Benthonic foraminiferal mass extinction and survival assemblages from the Cenomanian-Turonian Boundary Event in the Menoyo Section, northern Spain / Geological Society, London, Special Publications, 102:245-258, doi:10.1144/GSL.SP.1996.001.01.18 --- Nataliya A. Tur: Planktonic foraminifera recovery from the Cenomanian-Turonian mass extinction event, northeastern Caucasus / Geological Society, London, Special Publications, 102:259-264, doi:10.1144/GSL.SP.1996.001.01.19 --- M. B. Hart: Recovery of the food chain after the Late Cenomanian extinction event / Geological Society, London, Special Publications, 102:265-277, doi:10.1144/GSL.SP.1996.001.01.20 --- M. E. J. Fitzpatrick: Recovery of Turonian dinoflagellate cyst assemblages from the effects of the oceanic anoxic event at the end of the Cenomanian in southern England / Geological Society, London, Special Publications, 102:279-297, doi:10.1144/GSL.SP.1996.001.01.21 --- Elena A. Yazykova: Post-crisis recovery of Campanian desmoceratacean ammonites from Sakhalin, far east Russia / Geological Society, London, Special Publications, 102:299-307, doi:10.1144/GSL.SP.1996.001.01.22 --- Carl F. Koch: Latest Cretaceous mollusc species ‘fabric’ of the US Atlantic and Gulf Coastal Plain: a baseline for measuring biotic recovery / Geological Society, London, Special Publications, 102:309-317, doi:10.1144/GSL.SP.1996.001.01.23 --- Cenozoic --- Eduardo A. M. Koutsoukos: Phenotypic experiments into new pelagic niches in early Danian planktonic foraminifera: aftermath of the K/T boundary event / Geological Society, London, Special Publications, 102:319-335, doi:10.1144/GSL.SP.1996.001.01.24 --- E. M. Bugrova: Recovery of North Caucasus foraminiferal assemblages after the pre-Danian extinctions / Geological Society, London, Special Publications, 102:337-342, doi:10.1144/GSL.SP.1996.001.01.25 --- R. P. Speijer and G. J. Van Der Zwaan: Extinction and survivorship of southern Tethyan Benthic foraminifera across the Cretaceous/Palaeogene boundary / Geological Society, London, Special Publications, 102:343-371, doi:10.1144/GSL.SP.1996.001.01.26 --- Patricia H. Kelley and Thor A. Hansen: Recovery of the naticid gastropod predator-prey system from the Cretaceous-Tertiary and Eocene-Oligocene extinctions / Geological Society, London, Special Publications, 102:373-386, doi:10.1144/GSL.SP.1996.001.01.27
    Seiten: Online-Ressource (VI, 394 Seiten) , Illustrationen, Diagramme
    ISBN: 1897799454
    Sprache: Englisch
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  • 15
    Schlagwort(e): Kohlenwasserstofflagerstätte ; Paläomagnetismus ; Geology ; Paleomagnetism ; Paleomagnetismo ; Petroleo (mineracao) ; Petroleum ; Prospecting
    Beschreibung / Inhaltsverzeichnis: Peter Turner and Amanda Turner: Palaeomagnetic Applications in Hydrocarbon Exploration and Production: Introduction / Geological Society, London, Special Publications, 98:1-5, doi:10.1144/GSL.SP.1995.098.01.01 --- Magnetic Mineral Assemblages and Hydrocarbons --- Hans G. Machel: Magnetic mineral assemblages and magnetic contrasts in diagenetic environments — with implications for studies of palaeomagnetism, hydrocarbon migration and exploration / Geological Society, London, Special Publications, 98:9-29, doi:10.1144/GSL.SP.1995.098.01.02 --- Palaeomagnetic Properties of Hydrocarbon Reservoirs --- Hervé Perroud, Annick Chauvin, and Michel Rebelle: Hydrocarbon seepage dating through chemical remagnetization / Geological Society, London, Special Publications, 98:33-41, doi:10.1144/GSL.SP.1995.098.01.03 --- P. Turner, S. D. Burley, D. Rey, and J. Prosser: Burial history of the Penrith Sandstone (Lower Permian) deduced from the combined study of fluid inclusion and palaeomagnetic data / Geological Society, London, Special Publications, 98:43-78, doi:10.1144/GSL.SP.1995.098.01.04 --- Stuart A. Hall and Ian Evans: Palaeomagnetic and rock magnetic properties of hydrocarbon reservoir rocks from the Permian Basin, southeastern New Mexico, USA / Geological Society, London, Special Publications, 98:79-95, doi:10.1144/GSL.SP.1995.098.01.05 --- S. A. Johnson, P. Turner, A. Hartley, and D. Rey: Palaeomagnetic implications for the timing of hematite precipitation and remagnetization in the Carboniferous Barren Red Measures, UK southern North Sea / Geological Society, London, Special Publications, 98:97-117, doi:10.1144/GSL.SP.1995.098.01.06 --- Mark W. Hounslow, Barbara A. Maher, and Laurence Thistlewood: Magnetic mineralogy of sandstones from the Lunde Formation (late Triassic), northern North Sea, UK: origin of the palaeomagnetic signal / Geological Society, London, Special Publications, 98:119-147, doi:10.1144/GSL.SP.1995.098.01.07 --- Claus Beyer: Results from a palaeomagnetic investigation of the Brent Group sediments in wells 34/10–16 and 34/10–17 showing evidence for complete remagnetization of the sediment / Geological Society, London, Special Publications, 98:149-159, doi:10.1144/GSL.SP.1995.098.01.08 --- Magnetostratigraphic Applications --- Mark W. Hounslow, Barbara A. Maher, Laurence Thistlewood, and Kevin Dean: Magnetostratigraphic correlations in two cores from the late Triassic Lunde Formation, Beryl Field, northern North Sea, UK / Geological Society, London, Special Publications, 98:163-172, doi:10.1144/GSL.SP.1995.098.01.09 --- Kifaya N. Belkaaloul, Djafar M. Aissaoui, Michel Rebelle, and Gerard Sambet: Magnetostratigraphic correlations of the Jurassic carbonates from the Paris Basin: implications for petroleum exploration / Geological Society, London, Special Publications, 98:173-186, doi:10.1144/GSL.SP.1995.098.01.10 --- Eirik Hauger and Paul Van Veen: Application of magnetostratigraphy to Brent Group reservoir zonation in the Visund Field / Geological Society, London, Special Publications, 98:187-204, doi:10.1144/GSL.SP.1995.098.01.11 --- Gillian M. Turner and Ian D. Bryant: Application of a palaeomagnetic reversal stratigraphy to constrain well correlation and sequence stratigraphic interpretation of the Eocene C1 Sands, Maui Field, New Zealand / Geological Society, London, Special Publications, 98:205-221, doi:10.1144/GSL.SP.1995.098.01.12 --- R. Thompson and T. D. J. Cameron: Palaeomagnetic study of Cenozoic sediments in North Sea boreholes: an example of a magnetostratigraphic conundrum in a hydrocarbonproducing area / Geological Society, London, Special Publications, 98:223-236, doi:10.1144/GSL.SP.1995.098.01.13 --- Core Orientation and Susceptibility Logging --- T. C. Rolph, J. Shaw, T. R. Harper, and J. T. Hagan: Viscous remanent magnetization: a tool for orientation of drill cores / Geological Society, London, Special Publications, 98:239-243, doi:10.1144/GSL.SP.1995.098.01.14 --- E. A. Hailwood and F. Ding: Palaeomagnetic reorientation of cores and the magnetic fabric of hydrocarbon reservoir sands / Geological Society, London, Special Publications, 98:245-258, doi:10.1144/GSL.SP.1995.098.01.15 --- Reidar Løvlie and Paul Van Veen: Magnetic susceptibility of a 180 m sediment core: reliability of incremental sampling and evidence for a relationship between susceptibility and gamma activity / Geological Society, London, Special Publications, 98:259-266, doi:10.1144/GSL.SP.1995.098.01.16 --- H. Shi and D. H. Tarling: Magnetic field of a core barrel / Geological Society, London, Special Publications, 98:267-272, doi:10.1144/GSL.SP.1995.098.01.17 --- D. H. Tarling and H. Shi: Magnetic anisotropy of borehole core samples / Geological Society, London, Special Publications, 98:273-280, doi:10.1144/GSL.SP.1995.098.01.18 --- Structural Applications --- S. A. Stewart and K. C. Jackson: Palaeomagnetic analysis of fold closure growth and volumetrics / Geological Society, London, Special Publications, 98:283-295, doi:10.1144/GSL.SP.1995.098.01.19
    Seiten: Online-Ressource (301 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 189779942X
    Sprache: Englisch
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  • 16
    Schlagwort(e): Methode ; Strukturgeologie ; Geologia estrutural ; Geological modeling ; Geology ; Geology, Structural ; Methodology ; Petroleum
    Beschreibung / Inhaltsverzeichnis: D. A. Nieuwland and P. G. Buchanan: Introduction / Geological Society, London, Special Publications, 99:1-3, doi:10.1144/GSL.SP.1996.099.01.01 --- Seismic Interpretation --- T. R. Horscroft and J. E. Bain: Validation of seismic data processing and interpretation with integration of gravity and magnetic data / Geological Society, London, Special Publications, 99:5-9, doi:10.1144/GSL.SP.1996.099.01.02 --- G. Pickering, J. M. Bull, and D. J. Sanderson: Scaling of fault displacements and implications for the estimation of sub-seismic strain / Geological Society, London, Special Publications, 99:11-26, doi:10.1144/GSL.SP.1996.099.01.03 --- J. J. Walsh, J. Watterson, C. Childs, and A. Nicol: Ductile strain effects in the analysis of seismic interpretations of normal fault systems / Geological Society, London, Special Publications, 99:27-40, doi:10.1144/GSL.SP.1996.099.01.04 --- Palinspastic Reconstruction and Forward Modelling --- James G. Buchanan: The application of cross-section construction and validation within exploration and production: a discussion / Geological Society, London, Special Publications, 99:41-50, doi:10.1144/GSL.SP.1996.099.01.05 --- Mike P. Coward: Balancing sections through inverted basins / Geological Society, London, Special Publications, 99:51-77, doi:10.1144/GSL.SP.1996.099.01.06 --- Richard H. Groshong, Jr: Construction and validation of extensional cross sections using lost area and strain, with application to the Rhine Graben / Geological Society, London, Special Publications, 99:79-87, doi:10.1144/GSL.SP.1996.099.01.07 --- T. A. Hauge and G. G. Gray: A critique of techniques for modelling normal-fault and rollover geometries / Geological Society, London, Special Publications, 99:89-97, doi:10.1144/GSL.SP.1996.099.01.08 --- Kevin C. Hill and Gareth T. Cooper: A strategy for palinspastic restoration of inverted basins: thermal and structural analyses in SE Australia / Geological Society, London, Special Publications, 99:99-115, doi:10.1144/GSL.SP.1996.099.01.09 --- C. K. Morley: Discussion of potential errors in fault heave methods for extension estimates in rifts, with particular reference to fractal fault populations and inherited fabrics / Geological Society, London, Special Publications, 99:117-134, doi:10.1144/GSL.SP.1996.099.01.10 --- A. G. Skuce: Forward modelling of compaction above normal faults: an example from the Sirte Basin, Libya / Geological Society, London, Special Publications, 99:135-146, doi:10.1144/GSL.SP.1996.099.01.11 --- Mark G. Rowan: Benefits and limitations of section restoration in areas of extensional salt tectonics: an example from offshore Louisiana / Geological Society, London, Special Publications, 99:147-161, doi:10.1144/GSL.SP.1996.099.01.12 --- Fault Populations and Geometric Analyses --- Joseph A. Cartwright, Chris Mansfield, and Bruce Trudgill: The growth of normal faults by segment linkage / Geological Society, London, Special Publications, 99:163-177, doi:10.1144/GSL.SP.1996.099.01.13 --- Hugh G. Kerr and Nicky White: Kinematic modelling of normal fault geometries using inverse theory / Geological Society, London, Special Publications, 99:179-188, doi:10.1144/GSL.SP.1996.099.01.14 --- D. T. Needham, G. Yielding, and B. Freeman: Analysis of fault geometry and displacement patterns / Geological Society, London, Special Publications, 99:189-199, doi:10.1144/GSL.SP.1996.099.01.15 --- Analogue Modelling --- K. R. McClay: Recent advances in analogue modelling: uses in section interpretation and validation / Geological Society, London, Special Publications, 99:201-225, doi:10.1144/GSL.SP.1996.099.01.16 --- Mark Verschuren, Dick Nieuwland, and Jim Gast: Multiple detachment levels in thrust tectonics: Sandbox experiments and palinspastic reconstruction / Geological Society, London, Special Publications, 99:227-234, doi:10.1144/GSL.SP.1996.099.01.17 --- Mathematical Modelling --- J. D. Barnichon and R. Charlier: Finite element modelling of the competition between shear bands in the early stages of thrusting: Strain localization analysis and constitutive law influence / Geological Society, London, Special Publications, 99:235-250, doi:10.1144/GSL.SP.1996.099.01.18 --- F. Beekman, J. M. Bull, S. Cloetingh, and R. A. Scrutton: Crustal fault reactivation facilitating lithospheric folding/buckling in the central Indian Ocean / Geological Society, London, Special Publications, 99:251-263, doi:10.1144/GSL.SP.1996.099.01.19 --- Stuart Hardy, Josep Poblet, Ken McClay, and Dave Waltham: Mathematical modelling of growth strata associated with fault-related fold structures / Geological Society, London, Special Publications, 99:265-282, doi:10.1144/GSL.SP.1996.099.01.20 --- M. Ter Voorde and S. Cloetingh: Numerical modelling of extension in faulted crust: effects of localized and regional deformation on basin stratigraphy / Geological Society, London, Special Publications, 99:283-296, doi:10.1144/GSL.SP.1996.099.01.21 --- J. D. Van Wees, S. Cloetingh, and G. de Vicente: The role of pre-existing faults in basin evolution: constraints from 2D finite element and 3D flexure models / Geological Society, London, Special Publications, 99:297-320, doi:10.1144/GSL.SP.1996.099.01.22 --- Regional Analyses and Remote Sensing --- M. W. Insley, F. X. Murphy, D. Naylor, and M. Critchley: The use of satellite imagery in the validation and verification of structural interpretations for hydrocarbon exploration in Pakistan and Yemen / Geological Society, London, Special Publications, 99:321-343, doi:10.1144/GSL.SP.1996.099.01.23 --- Jonathan P. Turner: Gravity-driven nappes and their relation to palaeobathymetry: examples from West Africa and Cardigan Bay, UK / Geological Society, London, Special Publications, 99:345-362, doi:10.1144/GSL.SP.1996.099.01.24
    Seiten: Online-Ressource (VI, 369 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1897799438
    Sprache: Englisch
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  • 17
    Unbekannt
    Berlin ; Heidelberg : Springer
    Beschreibung / Inhaltsverzeichnis: PREFACE The ocean has always been reluctant to reveal its secrets. Its size and the inaccessibility of its deeper regions have made their safeguard a reasonably simple matter with the result that significant misconceptions persisted for many years. Two of the most widespread of these concerned the featureless nature of the sea floor and the silence of the deep ocean. Underwater acoustics has played a key role in discrediting both and in so doing introduced new and exciting developments in oceanography and geophysics. In the years following World War II, echosounders and subbottom profilers based on new active sonar technology, revealed the true nature of the seafloor topography and led to the major advances represented by plate tectonics. Research driven by the requirements of passive sonar, on the other hand, was to demonstrate that the sea was not silent but was characterised by a complex noise spectrum. Many individual mechanisms and sources ranging from man-made, biological and geophysical activity to the intrinsic noise of the sea itself were found to contribute to this spectrum. A major component, which is the subject of this book, was to remain unrecognised to underwater acoustics until noise measurements could be made effectively at very low frequencies, although its presence had been indicated by seismology long before these measurements were possible. By virtue of its geographical isolation in the Southern Ocean, New Zealand has provided an ideal environment for long-range propagation and ambient noise investigations and numerous studies have been reported. Our interest in the subject of this book was aroused initially in the course of one such experiment in 1966. For the first time it had been possible to extend the recording bandwidth to 1 Hz and the improved performance of this new system was anticipated eagerly. However the main purpose of the experiment was nearly aborted by the appearance of a new and unsuspected noise component at frequencies below 10 Hz. Due primarily to technical limitations in the equipment then available, a subsequent programme, designed to identify the properties and origin of the source more clearly, was not productive and was soon abandoned. An opportunity to revisit the problem arose some 10 years later, when the University of Auckland became involved in a major environmental study in support of the development of an offshore gas field in Cook Strait. The technology then available provided an opportunity to examine afresh the relationship between sea state and the seismo-acoustic response generated. An initial trim demonstrated the potential of the site. Accordingly a long-term programme, involving the parallel measurement of the oceanwave field and acoustic response, was undertaken in a series of student research theses. The data so gathered were of sufficiently high quality to ultimately establish wave-wave interactions as the source of the acoustic effects observed and to identify many of its characteristics. This result was soon to be confirmed by other studies. As the noise data accumulated, however, it became apparent that certain refinements to the theories describing the mechanism were required. Our attempts to provide these refinements have been reported in a number of contributions in recent years. The accounts of these and similar contributions by others have unfortunately appeared in the literature in a somewhat disjointed manner, with the result that the evolution of the subject has not been easy to follow. This book attempts to present a more coherent account of the subject and its development. Most of the early experimental and theoretical results from our group have arisen from two key Ph.D. theses, due to Dr. K.C. Ewans and Dr. C.Y. Wu. The painstaking and careful instrumentation development and data analysis provided by Dr. Ewans were critical to the definitive correlation which we were able to establish between wind field, seastate and the acoustic response so generated. Dr. Wu's thesis presented the first phase of our attempt at the resolution of certain key theoretical issues, which were identified in the course of the experimental programme. Both studies owe much to the support of Shell BP Todd Oil Services Ltd., acting for Maui Development Ltd., and to the University of Auckland. The support of the Electricity Corporation of New Zealand Ltd. during a later experimental investigation of the Southern Ocean wave field is also acknowledged...
    Seiten: Online-Ressource (313 Seiten)
    ISBN: 9783540607212
    Sprache: Englisch
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  • 18
    Unbekannt
    Basel, Boston, Berlin : Birkhäuser
    Schlagwort(e): civil engineering ; engineering seismology ; geodynamics ; mining ; seismology
    Beschreibung / Inhaltsverzeichnis: Induced seismic events are of high scientific and economic significance. They are the result of human activities interacting with regional and local tectonics, changing the local crustal stress state by mining, extraction of rock masses, injection of fluids into the rock massif, and by changing the surface loading and pore pressure state near large reservoirs. Within Europe the study of induced seismic events has a long tradition and international scientific organizations have actively stimulated the co-operation in this field. During its General Assembly in September 1994, the European Seismological Society organized the symposium "Induced Seismic Events". The focus of this symposium was concentrated on induced events in central and eastern Europe, as well as in the former Soviet Union. The major contributions to the symposium, and also some Chinese, Canadian, and South African results are presented here. Case studies as well as data analyses and methodological studies are included. Seismologists and specialists working in the field of geohazard prevention will find much information in this volume that is pertinent to their work.
    Seiten: Online-Ressource (227 Seiten)
    ISBN: 9783764354541
    Sprache: Englisch
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  • 19
    Unbekannt
    Basel, Boston, Berlin : Birkhäuser
    Schlagwort(e): seismic waves ; geophysics ; seismology
    Beschreibung / Inhaltsverzeichnis: The special issue contains contributions presented at the international workshop Seismic waves in laterally inhomogeneous media IV, which was held at the Castle of Trest, Czech Republic, May 22-27, 1995. The workshop, which was attended by about 100 seismologists from more than 10 countries, was devoted mainly to the current state of theoretical and computational means of study of seismic wave propagation in complex structures. The special issue can be of interest for theoretical, global and explorational seismologists. The first part contains papers dealing with the study and the use of various methods of solving forward and inverse problems in complicated structures. Among other methods, discrete-wave number method, the finite-difference method, the edge-wave supperposition method and the ray method are studied and used. Most papers contained in the second part are related to the ray method. The most important topics are two-point ray tracing, grid calculations of travel times and amplitudes and seismic wave propagation in anisotropic media.
    Seiten: Online-Ressource (372 Seiten)
    ISBN: 9783034890496
    Sprache: Englisch
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  • 20
    Schlagwort(e): Geology, Stratigraphic ; Stratigraphy ; Sequenzstratigraphie ; Estratigrafia
    Beschreibung / Inhaltsverzeichnis: John F. Aitken and John A. Howell: High resolution sequence stratigraphy: innovations, applications and future prospects / Geological Society, London, Special Publications, 104:1-9, doi:10.1144/GSL.SP.1996.104.01.01 --- S. F. Mitchell, C. R. C. Paul, and A. S. Gale: Carbon isotopes and sequence stratigraphy / Geological Society, London, Special Publications, 104:11-24, doi:10.1144/GSL.SP.1996.104.01.02 --- S. J. Davies and T. Elliott: Spectral gamma ray characterization of high resolution sequence stratigraphy: examples from Upper Carboniferous fluvio-deltaic systems, County Clare, Ireland / Geological Society, London, Special Publications, 104:25-35, doi:10.1144/GSL.SP.1996.104.01.03 --- David G. Quirk: ‘Base profile’: a unifying concept in alluvial sequence stratigraphy / Geological Society, London, Special Publications, 104:37-49, doi:10.1144/GSL.SP.1996.104.01.04 --- Ian D. Bryant: The application of physical measurements to constrain reservoir-scale sequence stratigraphic models / Geological Society, London, Special Publications, 104:51-63, doi:10.1144/GSL.SP.1996.104.01.05 --- John M. Armentrout: High resolution sequence biostratigraphy: examples from the Gulf of Mexico Plio-Pleistocene / Geological Society, London, Special Publications, 104:65-86, doi:10.1144/GSL.SP.1996.104.01.06 --- David C. Jennette and Cheyenne O. Riley: Influence of relative sea-level on facies and reservoir geometry of the Middle Jurassic lower Brent Group, UK North Viking Graben / Geological Society, London, Special Publications, 104:87-113, doi:10.1144/GSL.SP.1996.104.01.07 --- F. L. Wehr and L. D. Brasher: Impact of sequence-based correlation style on reservoir model behaviour, lower Brent Group, North Cormorant Field, UK North Sea / Geological Society, London, Special Publications, 104:115-128, doi:10.1144/GSL.SP.1996.104.01.08 --- John A. Howell and Stephen S. Flint: A model for high resolution sequence stratigraphy within extensional basins / Geological Society, London, Special Publications, 104:129-137, doi:10.1144/GSL.SP.1996.104.01.09 --- T. McKie and I. R. Garden: Hierarchical stratigraphic cycles in the non-marine Clair Group (Devonian) UKCS / Geological Society, London, Special Publications, 104:139-157, doi:10.1144/GSL.SP.1996.104.01.10 --- A. Guy Plint: Marine and nonmarine systems tracts in fourth-order sequences in the Early-Middle Cenomanian, Dunvegan Alloformation, northeastern British Columbia, Canada / Geological Society, London, Special Publications, 104:159-191, doi:10.1144/GSL.SP.1996.104.01.11 --- John F. Aitken and Stephen S. Flint: Variable expressions of interfluvial sequence boundaries in the Breathitt Group (Pennsylvanian), eastern Kentucky, USA / Geological Society, London, Special Publications, 104:193-206, doi:10.1144/GSL.SP.1996.104.01.12 --- Ciaran J. O’Byrne and Stephen Flint: Interfluve sequence boundaries in the Grassy Member, Book Cliffs, Utah: criteria for recognition and implications for subsurface correlation / Geological Society, London, Special Publications, 104:207-220, doi:10.1144/GSL.SP.1996.104.01.13 --- Gary J. Hampson, Trevor Elliott, and Stephen S. Flint: Critical application of high resolution sequence stratigraphic concepts to the Rough Rock Group (Upper Carboniferous) of northern England / Geological Society, London, Special Publications, 104:221-246, doi:10.1144/GSL.SP.1996.104.01.14 --- David Uličný and Lenka Špičáková: Response to high frequency sea-level change in a fluvial to estuarine succession: Cenomanian palaeovalley fill, Bohemian Cretaceous Basin / Geological Society, London, Special Publications, 104:247-268, doi:10.1144/GSL.SP.1996.104.01.15 --- David Owen: Interbasinal correlation of the Cenomanian Stage; testing the lateral continuity of sequence boundaries / Geological Society, London, Special Publications, 104:269-293, doi:10.1144/GSL.SP.1996.104.01.16 --- Bruce W. Fouke, Arnout-Jan W. Everts, Erik W. Zwart, Wolfgang Schlager, P. C. Smalley, and Helmut Weissert: Subaerial exposure unconformities on the Vercors carbonate platform (SE France) and their sequence stratigraphic significance / Geological Society, London, Special Publications, 104:295-319, doi:10.1144/GSL.SP.1996.104.01.17 --- Dave Hunt, Tim Allsop, and Richard E. Swarbrick: Compaction as a primary control on the architecture and development of depositional sequences: conceptual framework, applications and implications / Geological Society, London, Special Publications, 104:321-345, doi:10.1144/GSL.SP.1996.104.01.18 --- Lars Stemmerik: High frequency sequence stratigraphy of a siliciclastic influenced carbonate platform, lower Moscovian, Amdrup Land, North Greenland / Geological Society, London, Special Publications, 104:347-365, doi:10.1144/GSL.SP.1996.104.01.19
    Seiten: Online-Ressource (VI, 374 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1897799489
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  • 21
    Schlagwort(e): Mittelmeerraum ; Paläomagnetismus ; Tektonik ; Cenozoic ; Geodynamics ; Geologia estrutural ; Geology, Stratigraphic ; Geology, Structural ; Mediterranean Region ; Mesozoic ; Paleomagnetism ; Paleomagnetismo ; Plate tectonics
    Beschreibung / Inhaltsverzeichnis: A. Morris and D. H. Tarling: Palaeomagnetism and tectonics of the Mediterranean region: an introduction / Geological Society, London, Special Publications, 105:1-18, doi:10.1144/GSL.SP.1996.105.01.01 --- Western Mediterranean --- A. Kirker and E. McClelland: Application of net tectonic rotations and inclination analysis to a high-resolution palaeomagnetic study in the Betic Cordillera / Geological Society, London, Special Publications, 105:19-32, doi:10.1144/GSL.SP.1996.105.01.02 --- J. J. Villalaín, M. L. Osete, R. Vegas, V. García-Dueñas, and F. Heller: The Neogene remagnetization in the western Betics: a brief comment on the reliability of palaeomagnetic directions / Geological Society, London, Special Publications, 105:33-41, doi:10.1144/GSL.SP.1996.105.01.03 --- H. Feinberg, O. Saddiqi, and A. Michard: New constraints on the bending of the Gibraltar Arc from palaeomagnetism of the Ronda peridotites (Betic Cordilleras, Spain) / Geological Society, London, Special Publications, 105:43-52, doi:10.1144/GSL.SP.1996.105.01.04 --- D. Khattach, D. Najid, N. Hamoumi, and D. H. Tarling: Palaeomagnetic studies in Morocco: tectonic implications for the Meseta and Anti-Atlas since the Permian / Geological Society, London, Special Publications, 105:53-57, doi:10.1144/GSL.SP.1996.105.01.05 --- D. Rey, P. Turner, and A. Ramos: Palaeomagnetism and magnetostratigraphy of the Middle Triassic in the Iberian Ranges (Central Spain) / Geological Society, London, Special Publications, 105:59-82, doi:10.1144/GSL.SP.1996.105.01.06 --- M. T. Juárez, M. L. Osete, R. Vegas, C. G. Langereis, and G. Meléndez: Palaeomagnetic study of Jurassic limestones from the Iberian Range (Spain): tectonic implications / Geological Society, London, Special Publications, 105:83-90, doi:10.1144/GSL.SP.1996.105.01.07 --- M. Garcés, J. M. Parés, and L. Cabrera: Inclination error linked to sedimentary facies in Miocene detrital sequences from the Vallès-Penedès Basin (NE Spain) / Geological Society, London, Special Publications, 105:91-99, doi:10.1144/GSL.SP.1996.105.01.08 --- P. Keller and U. Gehring: Consequences of post-collisional deformation on the reconstruction of the East Pyrenees / Geological Society, London, Special Publications, 105:101-109, doi:10.1144/GSL.SP.1996.105.01.09 --- J. L. Pereira, A. Rapalini, D. H. Tarling, and J. Fonseca: Palaeomagnetic dating and determination of tectonic tilting: a study of Mesozoic-Cenozoic igneous rocks in central West Portugal / Geological Society, London, Special Publications, 105:111-117, doi:10.1144/GSL.SP.1996.105.01.10 --- Central Mediterranean and Carpathians --- J. E. T. Channell: Palaeomagnetism and palaeogeography of Adria / Geological Society, London, Special Publications, 105:119-132, doi:10.1144/GSL.SP.1996.105.01.11 --- M. Iorio, G. Nardi, D. Pierattini, and D. H. Tarling: Palaeomagnetic evidence of block rotations in the Matese Mountains, Southern Apennines, Italy / Geological Society, London, Special Publications, 105:133-139, doi:10.1144/GSL.SP.1996.105.01.12 --- M. Mattei, C. Kissel, L. Sagnotti, R. Funiciello, and C. Faccenna: Lack of Late Miocene to Present rotation in the Northern Tyrrhenian margin (Italy): a constraint on geodynamic evolution / Geological Society, London, Special Publications, 105:141-146, doi:10.1144/GSL.SP.1996.105.01.13 --- M. Fedi, G. Florio, and A. Rapolla: The pattern of crustal block rotations in the Italian region deduced from aeromagnetic anomalies / Geological Society, London, Special Publications, 105:147-152, doi:10.1144/GSL.SP.1996.105.01.14 --- Emő Márton and Péter Márton: Large scale rotations in North Hungary during the Neogene as indicated by palaeomagnetic data / Geological Society, London, Special Publications, 105:153-173, doi:10.1144/GSL.SP.1996.105.01.15 --- Miroslav Krs, Marta Krsová, and Petr Pruner: Palaeomagnetism and palaeogeography of the Western Carpathians from the Permian to the Neogene / Geological Society, London, Special Publications, 105:175-184, doi:10.1144/GSL.SP.1996.105.01.16 --- Václav Houša, Miroslav Krs, Marta Krsová, and Petr Pruner: Magnetostratigraphy of Jurassic-Cretaceous limestones in the Western Carpathians / Geological Society, London, Special Publications, 105:185-194, doi:10.1144/GSL.SP.1996.105.01.17 --- M. Iorio, D. H. Tarling, B. D’argenio, and G. Nardi: Ultra-fine magnetostratigraphy of Cretaceous shallow water carbonates, Monte Raggeto, southern Italy / Geological Society, London, Special Publications, 105:195-203, doi:10.1144/GSL.SP.1996.105.01.18 --- E. McClelland, B. Finegan, and R. W. H. Butler: A magnetostratigraphic study of the onset of the Mediterranean Messinian salility crisis; Caltanissetta Basin, Sicily / Geological Society, London, Special Publications, 105:205-217, doi:10.1144/GSL.SP.1996.105.01.19 --- F. Florindo and L. Sagnotti: Revised magnetostratigraphy and rock magnetism of Pliocene sediments from Valle Ricca (Rome, Italy) / Geological Society, London, Special Publications, 105:219-223, doi:10.1144/GSL.SP.1996.105.01.20 --- Giancarlo Scalera, Paolo Favali, and Fabio Florindo: Palaeomagnetic database: the effect of quality filtering for geodynamic studies / Geological Society, London, Special Publications, 105:225-237, doi:10.1144/GSL.SP.1996.105.01.21 --- Eastern Mediterranean --- A. H. F. Robertson, J. E. Dixon, S. Brown, A. Collins, A. Morris, E. Pickett, I. Sharp, and T. Ustaömer: Alternative tectonic models for the Late Palaeozoic-Early Tertiary development of Tethys in the Eastern Mediterranean region / Geological Society, London, Special Publications, 105:239-263, doi:10.1144/GSL.SP.1996.105.01.22 --- H. J. Mauritsch, R. Scholger, S. L. Bushati, and A. Xhomo: Palaeomagnetic investigations in Northern Albania and their significance for the geodynamic evolution of the Adriatic-Aegean realm / Geological Society, London, Special Publications, 105:265-275, doi:10.1144/GSL.SP.1996.105.01.23 --- D. Kondopoulou, A. Atzemoglou, and S. Pavlides: Palaeomagnetism as a tool for testing geodynamic models in the North Aegean: convergences, controversies and a further hypothesis / Geological Society, London, Special Publications, 105:277-288, doi:10.1144/GSL.SP.1996.105.01.24 --- H. Feinberg, B. Edel, D. Kondopoulou, and A. Michard: Implications of ophiolite palaeomagnetism for the interpretation of the geodynamics of Northern Greece / Geological Society, London, Special Publications, 105:289-298, doi:10.1144/GSL.SP.1996.105.01.25 --- J. D. A. Piper, Joanna M. Moore, O. Tatar, H. Gursoy, and R. G. Park: Palaeomagnetic study of crustal deformation across an intracontinental transform: the North Anatolian Fault Zone in Northern Turkey / Geological Society, London, Special Publications, 105:299-310, doi:10.1144/GSL.SP.1996.105.01.26 --- Antony Morris: A review of palaeomagnetic research in the Troodos ophiolite, Cyprus / Geological Society, London, Special Publications, 105:311-324, doi:10.1144/GSL.SP.1996.105.01.27 --- A. M. Kafafy, D. H. Tarling, M. M. El Gamili, H. H. Hamama, and E. H. Ibrahim: Palaeomagnetism of some Cretaceous Nubian Sandstones, Northern Sinai, Egypt / Geological Society, London, Special Publications, 105:325-332, doi:10.1144/GSL.SP.1996.105.01.28 --- A. L. Abdeldayem and D. H. Tarling: Palaeomagnetism of some Tertiary sedimentary rocks, southwest Sinai, Egypt, in the tectonic framework of the SE Mediterranean / Geological Society, London, Special Publications, 105:333-343, doi:10.1144/GSL.SP.1996.105.01.29 --- Applications in Volcanology --- Leon Bardot, Rick Thomas, and Elizabeth McClelland: Emplacement temperatures of pyroclastic deposits on Santorini deduced from palaeomagnetic measurements: constraints on eruption mechanisms / Geological Society, London, Special Publications, 105:345-357, doi:10.1144/GSL.SP.1996.105.01.30 --- Maurizio De’ Gennaro, Paola R. Gialanella, Alberto Incoronato, Giuseppe Mastrolorenzo, and Debora Naimo: Palaeomagnetic controls on the emplacement of the Neapolitan Yellow Tuff (Campi Flegrei, Southern Italy) / Geological Society, London, Special Publications, 105:359-365, doi:10.1144/GSL.SP.1996.105.01.31 --- Alberto Incoronato: Magnetic stratigraphy procedures in volcanic areas: the experience at Vesuvius / Geological Society, London, Special Publications, 105:367-371, doi:10.1144/GSL.SP.1996.105.01.32 --- Archaeomagnetism --- M. E. Evans: Archaeomagnetic results from the Mediterranean region: an overview / Geological Society, London, Special Publications, 105:373-384, doi:10.1144/GSL.SP.1996.105.01.33 --- P. Márton: Archaeomagnetic directions: the Hungarian calibration curve / Geological Society, London, Special Publications, 105:385-399, doi:10.1144/GSL.SP.1996.105.01.34 --- A. Morris: Glossary of basic palaeomagnetic and rock magnetic terms / Geological Society, London, Special Publications, 105:401-415, doi:10.1144/GSL.SP.1996.105.01.35
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    ISBN: 1897799551
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  • 22
    Unbekannt
    London : The Geological Society
    Schlagwort(e): Großbritannien ; Nordsee ; Sequenzstratigraphie ; Corrélation stratigraphique - Grande-Bretagne ; Geology ; Great Britain ; Sequence stratigraphy ; Stratigraphic correlation ; Stratigraphie - Grande-Bretagne
    Beschreibung / Inhaltsverzeichnis: Stephen P. Hesselbo and D. Neil Parkinson: Sequence stratigraphy in British geology / Geological Society, London, Special Publications, 103:1-7, doi:10.1144/GSL.SP.1996.103.01.01 --- Non-Marine and Paralic Sequences --- P. M. Burgess and P. A. Allen: A forward-modelling analysis of the controls on sequence stratigraphical geometries / Geological Society, London, Special Publications, 103:9-24, doi:10.1144/GSL.SP.1996.103.01.02 --- M. R. Leeder and M. D. Stewart: Fluvial incision and sequence stratigraphy: alluvial responses to relative sea-level fall and their detection in the geological record / Geological Society, London, Special Publications, 103:25-39, doi:10.1144/GSL.SP.1996.103.01.03 --- J. P. Wonham and T. Elliott: High-resolution sequence stratigraphy of a mid-Cretaceous estuarine complex: the Woburn Sands of the Leighton Buzzard area, southern England / Geological Society, London, Special Publications, 103:41-62, doi:10.1144/GSL.SP.1996.103.01.04 --- V. P. Wright: Use of palaeosols in sequence stratigraphy of peritidal carbonates / Geological Society, London, Special Publications, 103:63-74, doi:10.1144/GSL.SP.1996.103.01.05 --- Shallow Marine Sequences --- Richard V. Tyson: Sequence-stratigraphical interpretation of organic facies variations in marine siliciclastic systems: general principles and application to the onshore Kimmeridge Clay Formation, UK / Geological Society, London, Special Publications, 103:75-96, doi:10.1144/GSL.SP.1996.103.01.06 --- J. H. S. Macquaker, K. G. Taylor, T. P. Young, and C. D. Curtis: Sedimentological and geochemical controls on ooidal ironstone and ‘bone-bed’ formation and some comments on their sequence-stratigraphical significance / Geological Society, London, Special Publications, 103:97-107, doi:10.1144/GSL.SP.1996.103.01.07 --- Angela L. Coe: Unconformities within the Portlandian Stage of the Wessex Basin and their sequence-stratigraphical significance / Geological Society, London, Special Publications, 103:109-143, doi:10.1144/GSL.SP.1996.103.01.08 --- Deep Marine Sequences --- G. Shanmugam, R. B. Bloch, S. M. Mitchell, J. E. Damuth, G. W. J. Beamish, R. J. Hodgkinson, T. Straume, S. E. Syvertsen, and K. E. Shields: Slump and debris-flow dominated basin-floor fans in the North Sea: an evaluation of conceptual sequence-stratigraphical models based on conventional core data / Geological Society, London, Special Publications, 103:145-176, doi:10.1144/GSL.SP.1996.103.01.09 --- Andrew S. Gale: Turonian correlation and sequence stratigraphy of the Chalk in southern England / Geological Society, London, Special Publications, 103:177-195, doi:10.1144/GSL.SP.1996.103.01.10 --- N. H. Woodcock, A. J. Butler, J. R. Davies, and R. A. Waters: Sequence stratigraphical analysis of late ordovician and early Silurian depositional systems in the Welsh Basin: a critical assessment / Geological Society, London, Special Publications, 103:197-208, doi:10.1144/GSL.SP.1996.103.01.11 --- Regional Studies --- Robert W. O’B. Knox: Tectonic controls on sequence development in the Palaeocene and earliest Eocene of southeast England: implications for North Sea stratigraphy / Geological Society, London, Special Publications, 103:209-230, doi:10.1144/GSL.SP.1996.103.01.12 --- D. N. Parkinson: Gamma-ray spectrometry as a tool for stratigraphical interpretation: examples from the western European Lower Jurassic / Geological Society, London, Special Publications, 103:231-255, doi:10.1144/GSL.SP.1996.103.01.13 --- B. W. Glover and T. McKie: A sequence stratigraphical approach to the understanding of basin history in orogenic Neoproterozoic successions: an example from the central Highlands of Scotland / Geological Society, London, Special Publications, 103:257-269, doi:10.1144/GSL.SP.1996.103.01.15
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    ISBN: 1897799497
    Sprache: Englisch
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  • 23
    Unbekannt
    London : The Geological Society
    Schlagwort(e): Salztektonik ; Salze ; Diapirs ; Evaporite ; Salt tectonics ; Sel
    Beschreibung / Inhaltsverzeichnis: Ian Davison, Ian Alsop, and Derek Blundell: Salt tectonics: some aspects of deformation mechanics / Geological Society, London, Special Publications, 100:1-10, doi:10.1144/GSL.SP.1996.100.01.01 --- Outcrop, Mine and Borehole Studies --- Stanisław Burliga: Kinematics within the Kłodawa salt diapir, central Poland / Geological Society, London, Special Publications, 100:11-21, doi:10.1144/GSL.SP.1996.100.01.02 --- Ian Davison, Dan Bosence, G. Ian Alsop, and Mohammed H. Al-Aawah: Deformation and sedimentation around active Miocene salt diapirs on the Tihama Plain, northwest Yemen / Geological Society, London, Special Publications, 100:23-39, doi:10.1144/GSL.SP.1996.100.01.03 --- Amos Frumkin: Uplift rate relative to base-levels of a salt diapir (Dead Sea Basin, Israel) as indicated by cave levels / Geological Society, London, Special Publications, 100:41-47, doi:10.1144/GSL.SP.1996.100.01.04 --- Manuel Hoyos, Miguel Doblas, Sergio Sánchez-Moral, Juan Carlos Cañaveras, Salvador Ordoñez, Carmen Sesé, Enrique Sanz, and Vicente Mahecha: Hydration diapirism: a climate-related initiation of evaporite mounds in two continental Neogene basins of central Spain / Geological Society, London, Special Publications, 100:49-63, doi:10.1144/GSL.SP.1996.100.01.05 --- M. Sans, A. L. Sánchez, and P. Santanach: Internal structure of a detachment horizon in the most external part of the Pyrenean fold and thrust belt (northern Spain) / Geological Society, London, Special Publications, 100:65-76, doi:10.1144/GSL.SP.1996.100.01.06 --- Denys B. Smith: Deformation in the late Permian Boulby Halite (EZ3Na) in Teesside, NE England / Geological Society, London, Special Publications, 100:77-87, doi:10.1144/GSL.SP.1996.100.01.07 --- C. J. Talbot and M. Alavi: The past of a future syntaxis across the Zagros / Geological Society, London, Special Publications, 100:89-109, doi:10.1144/GSL.SP.1996.100.01.08 --- Regional Case Studies --- Peter G. Buchanan, Daniel J. Bishop, and David N. Hood: Development of salt-related structures in the Central North Sea: results from section balancing / Geological Society, London, Special Publications, 100:111-128, doi:10.1144/GSL.SP.1996.100.01.09 --- H. S. Edgell: Salt tectonism in the Persian Gulf Basin / Geological Society, London, Special Publications, 100:129-151, doi:10.1144/GSL.SP.1996.100.01.10 --- Fivos Spathopoulos: An insight on salt tectonics in the Angola Basin, South Atlantic / Geological Society, London, Special Publications, 100:153-174, doi:10.1144/GSL.SP.1996.100.01.11 --- S. A. Stewart, M. J. Harvey, S. C. Otto, and P. J. Weston: Influence of salt on fault geometry: examples from the UK salt basins / Geological Society, London, Special Publications, 100:175-202, doi:10.1144/GSL.SP.1996.100.01.12 --- Max Zirngast: The development of the Gorleben salt dome (northwest Germany) based on quantitative analysis of peripheral sinks / Geological Society, London, Special Publications, 100:203-226, doi:10.1144/GSL.SP.1996.100.01.13 --- Physical Modelling --- G. Ian Alsop: Physical modelling of fold and fracture geometries associated with salt diapirism / Geological Society, London, Special Publications, 100:227-241, doi:10.1144/GSL.SP.1996.100.01.14 --- H. Koyi: Salt flow by aggrading and prograding overburdens / Geological Society, London, Special Publications, 100:243-258, doi:10.1144/GSL.SP.1996.100.01.15 --- P. Szatmari, M. C. M. Guerra, and M. A. Pequeno: Genesis of large counter-regional normal fault by flow of Cretaceous salt in the South Atlantic Santos Basin, Brazil / Geological Society, London, Special Publications, 100:259-264, doi:10.1144/GSL.SP.1996.100.01.16 --- Numerical and Geophysical Modelling --- Harvey A. Cohen and Stuart Hardy: Numerical modelling of stratal architectures resulting from differential loading of a mobile substrate / Geological Society, London, Special Publications, 100:265-273, doi:10.1144/GSL.SP.1996.100.01.17 --- K. Petersen and I. Lerche: Temperature dependence of thermal anomalies near evolving salt structures: importance for reducing exploration risk / Geological Society, London, Special Publications, 100:275-290, doi:10.1144/GSL.SP.1996.100.01.18 --- Alexei N. B. Poliakov, Yuri Yu. Podladchikov, Ethan Ch. Dawson, and Christopher J. Talbot: Salt diapirism with simultaneous brittle faulting and viscous flow / Geological Society, London, Special Publications, 100:291-302, doi:10.1144/GSL.SP.1996.100.01.19
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    ISBN: 1897799446
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  • 24
    Beschreibung / Inhaltsverzeichnis: PREFACE Through the last few decades inversion concepts have become an integral past of experimental data interpretation in several branches of science. In numerous cases similar inversion-like techniques were developed independently in separate disciplines, sometimes based on different lines of reasoning, and sometimes not to the same level of sophistication. This fact was realized early in inversion history. In the seventies and eighties "generalized inversion" and "total inversion" became buzz words in Earth Science, and some even saw inversion as the panacea that would eventually raise all experimental science into a common optimal frame. It is true that a broad awareness of the generality of inversion methods is established by now. On the other hand, the volume of experimental data varies greatly among disciplines, as does the degree of nonlinearity and numerical load of forward calculations, the amount and accuracy of a priori information, and the criticality of correct error propagation analysis. Thus, some clear differences in terminology, philosophy and numerical implementation remain, some of them for good reasons, but some of them simply due to tradition and lack of interdisciplinary communication. In a sense the development of inversion methods could be viewed as an evolution process where it is important that "species" can arise and adapt through isolation, but where it is equally important that they compete and mate afterwards through interdisciplinary exchange of ideas. This book was actually initiated as a proceedings volume of the "Interdisciplinary Inversion Conference 1995", held at the University of Aarhus, Denmark. The aim of this conference was to further the competition and mating part of above-mentioned evolution process, and we decided to extend the effect through this publication of 35 selected contributions. The point of departure is a story about geophysics and astronomy, in which the classical methods of Backus and Gilbert from around 1970 have been picked up by helioseismology. Professor Douglas Gough, who is a pioneer in this field, is the right person to tell this success story of interdisciplinary exchange of research experience and techniques [1-31] (numbers refer to pages in this book). Practitioners of helioseismology like to stress the fact that the seismological coverage on the Sun in a sense is much more complete and accurate than it is on Earth. Indeed we witness vigorous developments in the Backus & Gilbert methods (termed MOLA/SOLA in the helioseismology literature) [32-59] driven by this fortunate data situation. Time may have come for geophysicists to look into helioseismology for new ideas. Seismic methods play a key role in the study of the Earth's lithosphere. The contributions in [79 - 130,139 - 150] relate to reflection seismic oil exploration, while methods for exploration of the whole crust and the underlying mantle axe presented in [131 - 138, 151 - 166]. Two contributions [167 - 185] present the application of inversion for the understanding of the origin of petroleum and the prediction of its migration in sedimentary basins. Inversion is applied to hydrogeophysical and environmental problems [186 - 222], where again developments are driven by the advent of new, mainly electromagnetic, experimental techniques. The role of inversion in electromagnetic investigations of the lithosphere/astenosphere system as well as the ionosphere axe exemplified in [223 - 238]. Geodesy has a fine tradition of sophisticated linear inversion of large, accurate sets of potential field data. This leads naturally to the fundamental study of continuous versus discrete inverse formulations found in [262-275]. Applications of inversion to geodetic satellite data are found in [239 - 261]. General mathematical and computational aspects are mainly found in [262 - 336]. Nonlinearity in weakly nonlinear problems may be coped with by careful modification of lineaxized methods [295 - 302]. Strongly nonlinear problems call for Monte Carlo methods, where the cooling scedule in simulated annealing [303 - 311,139 - 150] is critical for convergence to a useful (local) minimum, and the set of consistent models is explored through importance sampling [89 - 90]. The use of prior information, directly or indirectly, is a key issue in most contributions, ranging from Bayesian formulations based a priori covariances e.g. [98 - 112,122 - 130, 254 - 261], over more general but also less tractable prior probability densities [79 - 97], to inclusion of specific prior knowledge of shape [284 - 294, 312 - 319]. Given the differences and similarities in approach, can we benefit from exchange of ideas and experience? In practice ideas and experience seldom jump across discipline boundaries by themselves. Normally one must go and get them the hard way, for instance by reading and understanding papers from disciplines far from the home ground. Look at the journey into the interdisciplinary cross-field of inversion techniques as a demanding safari into an enormous hunting ground. This book is meant to provide a convenient starting point.
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  • 25
    Unbekannt
    Berlin ; Heidelberg : Springer
    Beschreibung / Inhaltsverzeichnis: PREFACE The aim of this volume is two-fold. At the more pragmatic level, it is to help answer the many questions about the structure of the Pacific continental margin of North America, which have arisen over the years as a result of continuing field mapping and geophysical surveys. The second objective is methodological - to illustrate the irreplaceable role of geological information among the various data sets used in earth-science studies. The need to address these issues became apparent to the author during the several years he spent taking part in geological and geophysical studies on the west coast of Canada. All too often, results of geologic field mapping disagreed with tectonic predictions from too-straightforward local applications of global plate reconstructions, which due to their generality do not always take a full account of specific character of particular regions. To be sure, the global approach has during the last q~/artercentury greatly expanded the vision of geoscientists, previously restricted to continental regions. However, a negative by-product of this expansion has been a decline of attention paid to local information, as tectonic studies have increasingly relied on simply fitting the development of a particular region into this or that prefabricated tectonic template. Direct geological observations have limitations of their own. The observer in most cases deals with products of geologic processes, rather than with the processes themselves. Field mapping provides local information, and many years of effort are needed before a regional overview becomes possible. Geologic mapping is restricted to the ground surface, and even the deepest drillholes cannot sample more than the outermost shell of the Earth. The factual side of geologic mapping is usually limited to determination of rock types and their relationships in areas of exposure. Conclusions about the three-dimensional structure of a region and its evolution are still mostly inferential. Broad incorporation into geological studies of geophysical data, assisted by ever-more-sophisticated modern computers, provides a huge volume of information unobtainable in other ways. Geophysical methods quickly afford regional coverage or images of the Earth's deep interior. Geophysical methods have prompted the application in geological sciences of methodologies borrowed from exact sciences, such as mathematics and physics. Particularly important has been quantitative modeling, which allows a scientist to use the known parameters of a system to predict others. But in taking this approach too far, one encounters a dangerous pitfall. A model is a simplified representation of a natural phenomenon. The quality of this or that representation is relative, and a representation is never perfect. To incorporate all characteristics of a geologic phenomenon, in a parametrized form, into a numerical or physical imitation is impossible. This requires one to rely on simplifying assumptions, and a model is no better than the assumptions at its base. Unrealistic assumptions lead to unrealistic models. When a disagreement arises between model predictions and observations - such as those from geologic field mapping - a modeler may be tempted to downplay the differences or the significance of the offending observations. It becomes tempting to underestimate the role of an experienced geologist as a principal arbiter of the realism of a model. But it is geological data and geological control that provide the ultimate means of testing abstract models. From this methodological position, the present study of the western North American continental margin is organized as follows: 1. Geological information, available from field mapping and drilling, is gathered and summarized. 2. Current geophysical models for this region are considered, with particular attention to their underlying assumptions. 3. The available data, geological and geophysical, are synthesized into an internally consistent geologic-evolution concept. 4. This concept is tested by comparison with direct geological observations from field mapping and drilling. Because most current data sets and models cover northwestern Washington and western British Columbia, particular attention was paid to these areas. Fortunately, these areas contain many keys that help understand the structure of the entire western North American continental margin, which has baffled scientists for decades. The author does not claim to have resolved all these problems, but he does believe he has made a useful contribution to understanding continental-oceanic plate interrelations at this continental margin. Rigidity of lithospheric plates is a critical assumption in current models of plate evolution. The lithophere of a plate is created at spreading centers manifested in the global system of mid-ocean ridges. It moves away from the place of its birth towards boundaries with other plates, with which it can interact in a variety of ways. Some interactions are of strike-slip type, with two plates simply sliding past each other. However, to compensate for the creation of new lithosphere at spreading centers, older lithosphere at some plate boundaries descends into the mantle as it is overriden by other plates. At such plate boundaries lie subduction zones. If both regimes occur along a single plate boundary, the transition between them must be abrupt. Unless it can be tied to a change in orientation of the boundary, it must be associated with a junction of not two, but three different plates. Such a template was used to interpret the structure and tectonic evolution of the western North American continental margin in the late 1960s and thereafter (Atwater, 1970; McManus et al., 1972; Barr and Chase, 1974; Riddihough and Hyndman, 1976). To satisfy the principles of rigid-plate tectonics, both regimes have to exist along this continental margin. Also needed in rigid-plate reconstructions is a plate triple junction somewhere between the areas of proven ongoing subduction (in Oregon and southern Washington) and transform plate motion (along the southeastern Alaska margin; Atwater, 1970; McManus et al., 1972). Such a triple junction has been placed off Queen Charlotte Sound offshore British Columbia (Keen and Hyndman, 1979; Riddihough et al., 1983), where a spreading center has been postulated between the Pacific and Explorer oceanic plates (Hyndman et al. 1979; Riddihough, 1984). Off northern Vancouver Island, a transform boundary between the Explorer and Juan de Fuca oceanic plates has been postulated, but both these plates are assumed to be subducting beneath Vancouver Island (Hyndman et al., 1979; Riddihough and Hyndman, 1989)o With the assumed universality of the rigid-plate model, "broad similarity" has been suggested between the geology of western Oregon and that of western British Columbia, and the Cascadia zone of active subduction has been extended as far north as the mouth of Queen Charlotte Sound (Riddihough, 1979, 1984). An accretionary sedimentary prism (Yorath, 1980) - or even an accretionary complex containing several exotic "terranes" (Davis and Hyndman, 1989) - has been postulated off Vancouver Island. Geological observations onshore and offshore (Shouldice, 1971; Tiffin et al., 1972) have come to be considered too "surficial" to be of major consequence for large-scale tectonic modeling (Yorath et al., 1985a,b; Yorath, 1987). Variants of the principal geophysical model for this area during the last decade (Clowes et al., 1987; Hyndman et alo, 1990; Spence et al. 1991; Yuan et al., 1992; Dehler and Clowes, 1992) have become increasingly distant from geological observations. As new model variants emerged, they were checked for internal consistency, compatibility with neighboring local models and fidelity to the overall assumed tectonic picture. However, detailed geological work continued, and many of its results proved incompatible with the conventional wisdom (Gehrels, 1990; Babcock et al., 1992, 1994; Allan et al., 1993; Lyatsky, 1993a). Importantly, questions arose about the applicability in this region of the conventional, simple rigid-plate assumption, as it was shown to be unable to account for all the geological and geophysical peculiarities in some areas (Carbotte et al., 1989; Allan et al., 1993; Davis and Currie, 1993). New solutions were made necessary by new findings and by rediscovery of forgotten old data (see Lyatsky et al., 1991; Lyatsky, 1993b). Without aiming to resolve all the outstanding debates, tectonic implications of the geologic mapping and drilling results in this region are considered in the following chapters. These results are integrated with geochemical and geophysical data. Interpretations of these data, made by this author and by other workers, are verified by geological observations and by geologically plausible extrapolations from these observations. In searching for solutions consistent with all the information, the author has restricted himself to analyzing continental-crust structures along this continental margin. He believes, however, that future models for the offshore regions of the northeastern Pacific should consider the results obtained herein.
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    ISBN: 9783540608424
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  • 26
    Unbekannt
    Berlin ; Heidelberg : Springer
    Schlagwort(e): GPS ; Global Positioning System ; geodesy
    Beschreibung / Inhaltsverzeichnis: The subject of the book is an indepth description of the theory and mathematical models behind the application of the Global Positioning System in geodesy and geodynamics. The text has been prepared by leading experts in the field, contributing their particular points of view. Unlike a collection of disjoint papers, the text provides a continous flow of ideas and developments. The mathematical models for GPS measurements are developed in the first half of the book, followed by the description of GPS solutions for geodetic applications on local, regional and global scales.
    Seiten: Online-Ressource (VII, 407 Seiten) , 120 schwarz-weiß Abbildungen
    ISBN: 9783540494478
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  • 27
    Schlagwort(e): Vulkanismus ; Glissements de terrain ; Lahars ; Landslides ; Volcanism ; Volcanisme ; Volcans
    Beschreibung / Inhaltsverzeichnis: W. J. McGuire: Volcano instability: a review of contemporary themes / Geological Society, London, Special Publications, 110:1-23, doi:10.1144/GSL.SP.1996.110.01.01 --- James W. Head III: Volcano instability development: a planetary perspective / Geological Society, London, Special Publications, 110:25-43, doi:10.1144/GSL.SP.1996.110.01.02 --- Derek Elsworth and Barry Voight: Evaluation of volcano flank instability triggered by dyke intrusion / Geological Society, London, Special Publications, 110:45-53, doi:10.1144/GSL.SP.1996.110.01.03 --- Alessandro Tibaldi: Mutual influence of dyking and collapses at Stromboli volcano, Italy / Geological Society, London, Special Publications, 110:55-63, doi:10.1144/GSL.SP.1996.110.01.04 --- Guido Russo, Grazia Giberti, and Giovanni Sartoris: The influence of regional stresses on the mechanical stability of volcanoes: Stromboli (Italy) / Geological Society, London, Special Publications, 110:65-75, doi:10.1144/GSL.SP.1996.110.01.05 --- S. J. Day: Hydrothermal pore fluid pressure and the stability of porous, permeable volcanoes / Geological Society, London, Special Publications, 110:77-93, doi:10.1144/GSL.SP.1996.110.01.06 --- Benjamin Van Wyk De Vries and Andrea Borgia: The role of basement in volcano deformation / Geological Society, London, Special Publications, 110:95-110, doi:10.1144/GSL.SP.1996.110.01.07 --- J. B. Murray and B. Voight: Slope stability and eruption prediction on the eastern flank of Mount Etna / Geological Society, London, Special Publications, 110:111-114, doi:10.1144/GSL.SP.1996.110.01.08 --- M. S. Smith and J. B. Shepherd: Tsunami waves generated by volcanic landslides: an assessment of the hazard associated with Kick ’em Jenny / Geological Society, London, Special Publications, 110:115-123, doi:10.1144/GSL.SP.1996.110.01.09 --- J. C. Carracedo: A simple model for the genesis of large gravitational landslide hazards in the Canary Islands / Geological Society, London, Special Publications, 110:125-135, doi:10.1144/GSL.SP.1996.110.01.10 --- James B. Garvin: Topographic characterization and monitoring of volcanoes via airborne laser altimetry / Geological Society, London, Special Publications, 110:137-152, doi:10.1144/GSL.SP.1996.110.01.11 --- C. Firth, I. Stewart, W. J. McGuire, S. Kershaw, and C. Vita-Finzi: Coastal elevation changes in eastern Sicily: implications for volcano instability at Mount Etna / Geological Society, London, Special Publications, 110:153-167, doi:10.1144/GSL.SP.1996.110.01.12 --- A. Montalto, S. Vinciguerra, S. Menza, and G. Patanè: Recent seismicity of Mount Etna: implications for flank instability / Geological Society, London, Special Publications, 110:169-177, doi:10.1144/GSL.SP.1996.110.01.13 --- R. Rasà, R. Azzaro, and O. Leonardi: Aseismic creep on faults and flank instability at Mount Etna volcano, Sicily / Geological Society, London, Special Publications, 110:179-192, doi:10.1144/GSL.SP.1996.110.01.14 --- Derek Rust and Marco Neri: The boundaries of large-scale collapse on the flanks of Mount Etna, Sicily / Geological Society, London, Special Publications, 110:193-208, doi:10.1144/GSL.SP.1996.110.01.15 --- D. De Rita and G. Giordano: Volcanological and structural evolution of Roccamonfina volcano (Italy): origin of the summit caldera / Geological Society, London, Special Publications, 110:209-224, doi:10.1144/GSL.SP.1996.110.01.16 --- D. De Rita, M. Di Filippo, and C. Rosa: Structural evolution of the Bracciano volcano-tectonic depression, Sabatini Volcanic District, Italy / Geological Society, London, Special Publications, 110:225-236, doi:10.1144/GSL.SP.1996.110.01.17 --- A. M. Duncan, P. D. Cole, J. E. Guest, and D. K. Chester: Transport and emplacement mechanisms of mass-flow deposits on Monte Vulture volcano, Basilicata, southern Italy / Geological Society, London, Special Publications, 110:237-247, doi:10.1144/GSL.SP.1996.110.01.18 --- Giorgio Buchner, Antonino Italiano, and Claudio Vita-Finzi: Recent uplift of Ischia, southern Italy / Geological Society, London, Special Publications, 110:249-252, doi:10.1144/GSL.SP.1996.110.01.19 --- J. Martí, J. Vila, and J. Rey: Deception Island (Bransfield Strait, Antarctica): an example of a volcanic caldera developed by extensional tectonics / Geological Society, London, Special Publications, 110:253-265, doi:10.1144/GSL.SP.1996.110.01.20 --- Hiromitsu Yamagishi: Destructive mass movements associated with Quaternary volcanoes in Hokkaido, Japan / Geological Society, London, Special Publications, 110:267-279, doi:10.1144/GSL.SP.1996.110.01.21 --- Michael O. Garcia: Turbidites from slope failure on Hawaiian volcanoes / Geological Society, London, Special Publications, 110:281-294, doi:10.1144/GSL.SP.1996.110.01.22 --- Philippe Labazuy: Recurrent landslides events on the submarine flank of Piton de la Fournaise volcano (Reunion Island) / Geological Society, London, Special Publications, 110:295-306, doi:10.1144/GSL.SP.1996.110.01.23 --- L. S. Crumpler, James W. Head, and Jayne C. Aubele: Calderas on Mars: characteristics, structure, and associated flank deformation / Geological Society, London, Special Publications, 110:307-348, doi:10.1144/GSL.SP.1996.110.01.24 --- M. H. Bulmer and J. E. Guest: Modified volcanic domes and associated debris aprons on Venus / Geological Society, London, Special Publications, 110:349-371, doi:10.1144/GSL.SP.1996.110.01.25 --- Roberto Carniel, Siro Casolo, and Franco Iacop: Spectral analysis of volcanic tremor associated with the 1993 paroxysmal events at Stromboli / Geological Society, London, Special Publications, 110:373-381, doi:10.1144/GSL.SP.1996.110.01.26
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    ISBN: 1897799608
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  • 28
    Schlagwort(e): Atlantischer Ozean Nord ; Jungquartär ; Kontinentalrand ; Paläoozeanographie ; Arctic Ocean Region ; Continental margins ; Geology, Stratigraphic ; North Atlantic Ocean Region ; Paleoceanography ; Quaternary
    Beschreibung / Inhaltsverzeichnis: John T. Andrews, William E. N. Austin, Helene Bergsten, and Anne E. Jennings: The Late Quaternary palaeoceanography of North Atlantic margins: an introduction / Geological Society, London, Special Publications, 111:1-6, doi:10.1144/GSL.SP.1996.111.01.01 --- Karen Luise Knudsen and William E. N. Austin: Late glacial foraminifera / Geological Society, London, Special Publications, 111:7-10, doi:10.1144/GSL.SP.1996.111.01.02 --- Canadian North Atlantic Margins --- J. T. Andrews, L. E. Osterman, A. E. Jennings, J. P. M. Syvitski, G. H. Miller, and N. Weiner: Abrupt changes in marine conditions, Sunneshine Fiord, eastern Baffin Island, NWT during the last deglacial transition: Younger Dryas and H-0 events / Geological Society, London, Special Publications, 111:11-27, doi:10.1144/GSL.SP.1996.111.01.03 --- Anne E. Jennings, Kathy A. Tedesco, John T. Andrews, and Matthew E. Kirby: Shelf erosion and glacial ice proximity in the Labrador Sea during and after Heinrich events (H-3 or 4 to H-0) as shown by foraminifera / Geological Society, London, Special Publications, 111:29-49, doi:10.1144/GSL.SP.1996.111.01.04 --- James P. M. Syvitski, C. F. Michael Lewis, David J. W. Piper, and James P. M. Syvitski: Palaeoceanographic information derived from acoustic surveys of glaciated continental margins: examples from eastern Canada / Geological Society, London, Special Publications, 111:51-76, doi:10.1144/GSL.SP.1996.111.01.05 --- R. R. Stea, R. Boyd, O. Costello, G. B. J. Fader, and D. B. Scott: Deglaciation of the inner Scotian Shelf, Nova Scotia: correlation of terrestrial and marine glacial events / Geological Society, London, Special Publications, 111:77-101, doi:10.1144/GSL.SP.1996.111.01.06 --- Frank R. Hall and Stefanie J. Reed: Rock (mineral)-magnetic properties of post-glacial (16–0.5 ka) sediments from the Emerald Basin (Scotian Shelf), Canada / Geological Society, London, Special Publications, 111:103-115, doi:10.1144/GSL.SP.1996.111.01.07 --- Arctic Ocean, East Greenland Margin and Northeastern North Atlantic --- Thomas M. Cronin, Gary S. Dwyer, Paul A. Baker, Julio Rodriguez-Lazaro, and William M. Briggs, Jr: Deep-sea ostracode shell chemistry (Mg:Ca ratios) and Late Quaternary Arctic Ocean history / Geological Society, London, Special Publications, 111:117-134, doi:10.1144/GSL.SP.1996.111.01.08 --- Ruediger Stein, Seung-il Nam, Hannes Grobe, and Hans Hubberten: Late Quaternary glacial history and short-term ice-rafted debris fluctuations along the East Greenland continental margin / Geological Society, London, Special Publications, 111:135-151, doi:10.1144/GSL.SP.1996.111.01.09 --- J. T. Andrews, Anne E. Jennings, T. Cooper, Kerstin M. Williams, and J. Mienert: Late Quaternary sedimentation along a fjord to shelf (trough) transect, East Greenland (c. 68° N) / Geological Society, London, Special Publications, 111:153-166, doi:10.1144/GSL.SP.1996.111.01.10 --- J. C. Duplessy, L. D. Labeyrie, and M. Paterne: North Atlantic sea surface conditions during the Younger Dryas cold event / Geological Society, London, Special Publications, 111:167-175, doi:10.1144/GSL.SP.1996.111.01.11 --- Nalân Koç, Eystein Jansen, Morten Hald, and Laurent Labeyrie: Late glacial-Holocene sea surface temperatures and gradients between the North Atlantic and the Norwegian Sea: implications for the Nordic heat pump / Geological Society, London, Special Publications, 111:177-185, doi:10.1144/GSL.SP.1996.111.01.12 --- Northwestern European and European Arctic Margins --- W. E. N. Austin and D. Kroon: Late glacial sedimentology, foraminifera and stable isotope stratigraphy of the Hebridean Continental Shelf, northwest Scotland / Geological Society, London, Special Publications, 111:187-213, doi:10.1144/GSL.SP.1996.111.01.13 --- J. D. Peacock: Marine mollescan proxy data applied to Scottish late glacial and Flandrian sites: strengths and limitations / Geological Society, London, Special Publications, 111:215-228, doi:10.1144/GSL.SP.1996.111.01.14 --- Ian Shennan, Mairéad M. Rutherford, James B. Innes, and Kevin J. Walker: Late glacial sea level and ocean margin environmental changes interpreted from biostratigraphic and lithostratigraphic studies of isolation basins in northwest Scotland / Geological Society, London, Special Publications, 111:229-244, doi:10.1144/GSL.SP.1996.111.01.15 --- Hui Jiang and Kjell Nordberg: Late Weichselian environmental changes of the southern Kattegat, Scandinavia, inferred from diatom records / Geological Society, London, Special Publications, 111:245-260, doi:10.1144/GSL.SP.1996.111.01.16 --- Niels Richardt: Sedimentological examination of the Late Weichselian sea-level history following deglaciation of northern Denmark / Geological Society, London, Special Publications, 111:261-273, doi:10.1144/GSL.SP.1996.111.01.17 --- Morten Hald, Trond Dokken, and Sveinung Hagen: Palaeoceanography on the European arctic margin during the last deglaciation / Geological Society, London, Special Publications, 111:275-287, doi:10.1144/GSL.SP.1996.111.01.18 --- J. Lloyd, D. Kroon, C. Laban, and G. Boulton: Deglaciation history and palaeoceanography of the western Spitsbergen margin since the last glacial maximum / Geological Society, London, Special Publications, 111:289-301, doi:10.1144/GSL.SP.1996.111.01.19 --- Tore O. Vorren and Jan S. Laberg: Late glacial air temperature, oceanographic and ice sheet interactions in the southern Barents Sea region / Geological Society, London, Special Publications, 111:303-321, doi:10.1144/GSL.SP.1996.111.01.20 --- Leonid Polyak and Valery Mikhailov: Post-glacial environments of the southeastern Barents Sea: foraminiferal evidence / Geological Society, London, Special Publications, 111:323-337, doi:10.1144/GSL.SP.1996.111.01.21 --- Mikko Punkari: Late Weichselian deglaciation of the Barents Sea and low salinity events in the Norwegian Sea / Geological Society, London, Special Publications, 111:339-349, doi:10.1144/GSL.SP.1996.111.01.22 --- Related Topics --- Karin A. F. Zonneveld and Karin P. Boessenkool: Palynology as a tool for land-sea correlation; an example from the eastern Mediterranean region / Geological Society, London, Special Publications, 111:351-357, doi:10.1144/GSL.SP.1996.111.01.23 --- Nils-Axel Mörner: Earth rotation, ocean circulation and palaeoclimate: the North Atlantic — European example / Geological Society, London, Special Publications, 111:359-370, doi:10.1144/GSL.SP.1996.111.01.24
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    ISBN: 1897799616
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  • 29
    Schlagwort(e): Gondwanaland ; Kontinentalverschiebung ; Tektonik ; Weddellmeer ; Gondwana (géologie) ; Tectonique - Antarctique - Weddell (Antarctique), Mer de
    Beschreibung / Inhaltsverzeichnis: E. C. King, R. A. Livermore, and B. C. Storey: Weddell Sea tectonics and Gondwana break-up: an introduction / Geological Society, London, Special Publications, 108:1-10, doi:10.1144/GSL.SP.1996.108.01.01 --- Michael L. Curtis and Bryan C. Storey: A review of geological constraints on the pre-break-up position of the Ellsworth Mountains within Gondwana: implications for Weddell Sea evolution / Geological Society, London, Special Publications, 108:11-30, doi:10.1144/GSL.SP.1996.108.01.02 --- Vic Divenere, Dennis V. Kent, and Ian W. D. Dalziel: Summary of palaeomagnetic results from West Antarctica: implications for the tectonic evolution of the Pacific margin of Gondwana during the Mesozoic / Geological Society, London, Special Publications, 108:31-43, doi:10.1144/GSL.SP.1996.108.01.03 --- T. S. Brewer, D. Rex, P. G. Guise, and C. J. Hawkesworth: Geochronology of Mesozoic tholeiitic magmatism in Antarctica: implications for the development of the failed Weddell Sea rift system / Geological Society, London, Special Publications, 108:45-61, doi:10.1144/GSL.SP.1996.108.01.04 --- G. H. Grantham: Aspects of Jurassic magmatism and faulting in western Dronning Maud Land, Antarctica: implications for Gondwana break-up / Geological Society, London, Special Publications, 108:63-71, doi:10.1144/GSL.SP.1996.108.01.05 --- W. Reimer, H. Miller, and H. Mehl: Mesozoic and Cenozoic palaeo-stress fields of the South Patagonian Massif deduced from structural and remote sensing data / Geological Society, London, Special Publications, 108:73-85, doi:10.1144/GSL.SP.1996.108.01.06 --- Bryan C. Storey, Alan P. M. Vaughan, and Ian L. Millar: Geodynamic evolution of the Antarctic Peninsula during Mesozoic times and its bearing on Weddell Sea history / Geological Society, London, Special Publications, 108:87-103, doi:10.1144/GSL.SP.1996.108.01.07 --- P. C. Richards, R. W. Gatliff, M. F. Quinn, N. G. T. Fannin, and J. P. Williamson: The geological evolution of the Falkland Islands continental shelf / Geological Society, London, Special Publications, 108:105-128, doi:10.1144/GSL.SP.1996.108.01.08 --- W. Jokat, C. Hübscher, U. Meyer, L. Oszko, T. Schöne, W. Versteeg, and H. Miller: The continental margin off East Antarctica between 10°W and 30°W / Geological Society, London, Special Publications, 108:129-141, doi:10.1144/GSL.SP.1996.108.01.09 --- R. J. Hunter, A. C. Johnson, and N. D. Aleshkova: Aeromagnetic data from the southern Weddell Sea embayment and adjacent areas: synthesis and interpretation / Geological Society, London, Special Publications, 108:143-154, doi:10.1144/GSL.SP.1996.108.01.10 --- David C. McAdoo and Seymour W. Laxon: Marine gravity from Geosat and ERS-1 altimetry in the Weddell Sea / Geological Society, London, Special Publications, 108:155-164, doi:10.1144/GSL.SP.1996.108.01.11 --- W. Jokat, H. Miller, and C. Hübscher: Crustal structure of the Antarctic continental margin in the eastern Weddell Sea / Geological Society, London, Special Publications, 108:165-174, doi:10.1144/GSL.SP.1996.108.01.12 --- G. L. Leitchenkov, H. Miller, and E. N. Zatzepin: Structure and Mesozoic evolution of the eastern Weddell Sea, Antarctica: history of early Gondwana break-up / Geological Society, London, Special Publications, 108:175-190, doi:10.1144/GSL.SP.1996.108.01.13 --- Joachim Jacobs, Norbert Kaul, and Klaus Weber: The history of denudation and resedimentation at the continental margin of western Dronning Maud Land, Antarctica, during break-up of Gondwana / Geological Society, London, Special Publications, 108:191-199, doi:10.1144/GSL.SP.1996.108.01.14 --- W. Jokat, H. Miller, and C. Hübscher: Structure and origin of southern Weddell Sea crust: results and implications / Geological Society, London, Special Publications, 108:201-211, doi:10.1144/GSL.SP.1996.108.01.15 --- E. C. King and A. C. Bell: New seismic data from the Ronne Ice Shelf, Antarctica / Geological Society, London, Special Publications, 108:213-226, doi:10.1144/GSL.SP.1996.108.01.16 --- R. A. Livermore and R. J. Hunter: Mesozoic seafloor spreading in the southern Weddell Sea / Geological Society, London, Special Publications, 108:227-241, doi:10.1144/GSL.SP.1996.108.01.17 --- H. A. Roeser, J. Fritsch, and K. Hinz: The development of the crust off Dronning Maud Land, East Antarctica / Geological Society, London, Special Publications, 108:243-264, doi:10.1144/GSL.SP.1996.108.01.18 --- Yoshifumi Nogi, Nobukazu Seama, Nobuhiro Isezaki, and Yoichi Fukuda: Magnetic anomaly lineations and fracture zones deduced from vector magnetic anomalies in the West Enderby Basin / Geological Society, London, Special Publications, 108:265-273, doi:10.1144/GSL.SP.1996.108.01.19
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  • 30
    Schlagwort(e): Unterkarbon ; Unteres Karbon ; Carboniferous ; Estratigrafia ; Europe ; Geology ; Geology, Stratigraphic ; Mississippian ; New Mexico
    Beschreibung / Inhaltsverzeichnis: Peter Strogen, Ian D. Somerville, and Gareth Ll. Jones: Preface / Geological Society, London, Special Publications, 107:vii-ix, doi:10.1144/GSL.SP.1996.107.01.01 --- Mineralization, Hydrocarbons and Diagenesis --- J. D. Johnston, D. Coller, G. Millar, and M. F. Critchley: Basement structural controls on Carboniferous-hosted base metal mineral deposits in Ireland / Geological Society, London, Special Publications, 107:1-21, doi:10.1144/GSL.SP.1996.107.01.02 --- E. Shearley, P. Redmond, M. King, and R. Goodman: Geological controls on mineralization and dolomitization of the Lisheen Zn-Pb-Ag deposit, Co. Tipperary, Ireland / Geological Society, London, Special Publications, 107:23-33, doi:10.1144/GSL.SP.1996.107.01.03 --- Cathy Hollis, Gordon Walkden, and Cathy Hollis: The use of burial diagenetic calcite cements to determine the controls upon hydrocarbon emplacement and mineralization on a carbonate platform, Derbyshire, England / Geological Society, London, Special Publications, 107:35-49, doi:10.1144/GSL.SP.1996.107.01.04 --- C. Veale and J. Parnell: Metal-organic interactions in the Dinantian Solway Basin, UK: inferences for oil migration studies / Geological Society, London, Special Publications, 107:51-63, doi:10.1144/GSL.SP.1996.107.01.05 --- Carbonate Buildups and Waulsortian Mud-Mounds --- Neil A. H. Pickard: Evidence for microbial influence on the development of Lower Carboniferous buildups / Geological Society, London, Special Publications, 107:65-82, doi:10.1144/GSL.SP.1996.107.01.06 --- Wayne M. Ahr and Robert J. Stanton, Jr.: Constituent composition of Early Mississippian carbonate buildups and their level-bottom equivalents, Sacramento Mountains, New Mexico / Geological Society, London, Special Publications, 107:83-95, doi:10.1144/GSL.SP.1996.107.01.07 --- Kent C. Kirkby and Dave Hunt: Episodic growth of a Waulsortian buildup: the Lower Carboniferous Muleshoe Mound, Sacramento Mountains, New Mexico, USA / Geological Society, London, Special Publications, 107:97-110, doi:10.1144/GSL.SP.1996.107.01.08 --- David L. Jeffery and Robert J. Stanton, Jr.: Biotic gradients on a homoclinal ramp: the Alamogordo Member of the Lake Valley Formation, Lower Mississippian, New Mexico, USA / Geological Society, London, Special Publications, 107:111-126, doi:10.1144/GSL.SP.1996.107.01.09 --- Ian D. Somerville, Peter Strogen, Gareth LL. Jones, and H. E. Anne Somerville: Late Viséan buildups at Kingscourt, Ireland: possible precursors for Upper Carboniferous bioherms / Geological Society, London, Special Publications, 107:127-144, doi:10.1144/GSL.SP.1996.107.01.10 --- Sergio Rodríguez: Development of coral reef-facies during the Viséan at Los Santos de Maimona, SW Spain / Geological Society, London, Special Publications, 107:145-152, doi:10.1144/GSL.SP.1996.107.01.11 --- Siliciclastic Rocks --- Carmen Moreno, Sonia Sierra, and Reinaldo Sáez: Evidence for catastrophism at the Famennian-Dinantian boundary in the Iberian Pyrite Belt / Geological Society, London, Special Publications, 107:153-162, doi:10.1144/GSL.SP.1996.107.01.12 --- Kelly Maguire, Jillian Thompson, and Stuart Gowland: Dinantian depositional environments along the northern margin of the Solway Basin, UK / Geological Society, London, Special Publications, 107:163-182, doi:10.1144/GSL.SP.1996.107.01.13 --- John R. Graham: Dinantian river systems and coastal zone sedimentation in northwest Ireland / Geological Society, London, Special Publications, 107:183-206, doi:10.1144/GSL.SP.1996.107.01.14 --- Carbonate Platforms and Ramps --- Giancarlo Rizzi, Colin J. R. Braithwaite, and Giancarlo Rizzi: Cyclic emersion surfaces and channels within Dinantian limestones hosting the giant Navan Zn-Pb deposit, Ireland / Geological Society, London, Special Publications, 107:207-219, doi:10.1144/GSL.SP.1996.107.01.15 --- A. D. Horbury and A. E. Adams: Microfacies associations in Asbian carbonates: an example from the Urswick Limestone Formation of the southern Lake District, northern England / Geological Society, London, Special Publications, 107:221-237, doi:10.1144/GSL.SP.1996.107.01.16 --- Stephen J. Gallagher: The stratigraphy and cyclicity of the late Dinantian platform carbonates in parts of southern and western Ireland / Geological Society, London, Special Publications, 107:239-251, doi:10.1144/GSL.SP.1996.107.01.17 --- John G. Kelly: Initiation, growth and decline of a tectonically controlled Asbian carbonate ramp: Cuilcagh Mountain area, NW Ireland / Geological Society, London, Special Publications, 107:253-262, doi:10.1144/GSL.SP.1996.107.01.18 --- P. Strogen, I. D. Somerville, N. A. H. Pickard, G. LL. Jones, and M. Fleming: Controls on ramp, platform and basinal sedimentation in the Dinantian of the Dublin Basin and Shannon Trough, Ireland / Geological Society, London, Special Publications, 107:263-279, doi:10.1144/GSL.SP.1996.107.01.19 --- Simon Vanstone: The influence of climatic change on exposure surface development: a case study from the Late Dinantian of England and Wales / Geological Society, London, Special Publications, 107:281-301, doi:10.1144/GSL.SP.1996.107.01.20 --- Basinal Facies --- Hans-Jürgen Gursky: Siliceous rocks of the Culm Basin, Germany / Geological Society, London, Special Publications, 107:303-314, doi:10.1144/GSL.SP.1996.107.01.21 --- Zdzislaw Belka, Stanislaw Skompski, and Janina Sobon-Podgorska: Reconstruction of a lost carbonate platform on the shelf of Fennosarmatia: evidence from Viséan polymictic debrites, Holy Cross Mountains, Poland / Geological Society, London, Special Publications, 107:315-329, doi:10.1144/GSL.SP.1996.107.01.22 --- D. Naylor, G. D. Sevastopulo, and A. G. Sleeman: Contemporaneous erosion and reworking within the Dinantian of the South Munster Basin / Geological Society, London, Special Publications, 107:331-343, doi:10.1144/GSL.SP.1996.107.01.23 --- J. G. Rees, J. D. Cornwell, Z. K. Dabek, and R. J. Merriman: The Apedale tuffs, North Staffordshire: probable remnants of a late Asbian/Brigantian (P1a) volcanic centre / Geological Society, London, Special Publications, 107:345-357, doi:10.1144/GSL.SP.1996.107.01.24 --- Faunas, Floras and Biostratigraphy --- Mariya KH. Makhlina: Cyclic stratigraphy, facies and fauna of the Lower Carboniferous (Dinantian) of the Moscow Syneclise and Voronezh Anteclise / Geological Society, London, Special Publications, 107:359-364, doi:10.1144/GSL.SP.1996.107.01.25 --- G. A. Rukina: Sequence biostratigraphy of the Tournaisian-Lower Viséan rocks of the Russian Platform / Geological Society, London, Special Publications, 107:365-369, doi:10.1144/GSL.SP.1996.107.01.26 --- G. LL. Jones and I. D. Somerville: Irish Dinantian biostratigraphy: practical applications / Geological Society, London, Special Publications, 107:371-385, doi:10.1144/GSL.SP.1996.107.01.27 --- O. A. Lebedev: Fish assemblages in the Tournaisian-Viséan environments of the East European Platform / Geological Society, London, Special Publications, 107:387-415, doi:10.1144/GSL.SP.1996.107.01.28 --- A. Ivanov: The Early Carboniferous chondrichthyans of the South Urals, Russia / Geological Society, London, Special Publications, 107:417-425, doi:10.1144/GSL.SP.1996.107.01.29 --- David A. T. Harper and Anna L. Jeffrey: Mid-Dinantian brachiopod biofacies from western Ireland / Geological Society, London, Special Publications, 107:427-436, doi:10.1144/GSL.SP.1996.107.01.30 --- Jim Smith: A palynofacies analysis of the Dinantian (Asbian) Glenade Sandstone Formation of the Leitrim Group, northwest Ireland / Geological Society, London, Special Publications, 107:437-448, doi:10.1144/GSL.SP.1996.107.01.31
    Seiten: Online-Ressource (IX, 463 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1897799586
    Sprache: Englisch
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  • 31
    Unbekannt
    London : The Geological Society
    Schlagwort(e): Südostasien ; Tektonik ; Geology, Structural ; Asia, Southeastern ; Plate tectonics
    Beschreibung / Inhaltsverzeichnis: Robert Hall, D. J. Blundell, and Robert Hall: Tectonic evolution of SE Asia: introduction / Geological Society, London, Special Publications, 106:vii-xiii, doi:10.1144/GSL.SP.1996.106.01.01 --- Part 1: Present-day Tectonics --- Robert McCaffrey: Slip partitioning at convergent plate boundaries of SE Asia / Geological Society, London, Special Publications, 106:3-18, doi:10.1144/GSL.SP.1996.106.01.02 --- Jacques André Malod and Badrul Mustafa Kemal: The Sumatra margin: oblique subduction and lateral displacement of the accretionary prism / Geological Society, London, Special Publications, 106:19-28, doi:10.1144/GSL.SP.1996.106.01.03 --- Claude Rangin, Daharta Dahrin, Ray Quebral, and The Modec Scientific Party: Collision and strike-slip faulting in the northern Molucca Sea (Philippines and Indonesia): preliminary results of a morphotectonic study / Geological Society, London, Special Publications, 106:29-46, doi:10.1144/GSL.SP.1996.106.01.04 --- A. N. Richardson, D. J. Blundell, and A. N. Richardson: Continental collision in the Banda arc / Geological Society, London, Special Publications, 106:47-60, doi:10.1144/GSL.SP.1996.106.01.05 --- David B. Snyder, John Milsom, and Hardi Prasetyo: Geophysical evidence for local indentor tectonics in the Banda arc east of Timor / Geological Society, London, Special Publications, 106:61-73, doi:10.1144/GSL.SP.1996.106.01.06 --- B. D. Hughes, K. Baxter, R. A. Clark, and D. B. Snyder: Detailed processing of seismic reflection data from the frontal part of the Timor trough accretionary wedge, eastern Indonesia / Geological Society, London, Special Publications, 106:75-83, doi:10.1144/GSL.SP.1996.106.01.07 --- John Milsom, Steve Kaye, and Sardjono: Extension, collision and curvature in the eastern Banda arc / Geological Society, London, Special Publications, 106:85-94, doi:10.1144/GSL.SP.1996.106.01.08 --- Part 2: Tectonic Development of Southeast Asia --- I. Metcalfe: Pre-Cretaceous evolution of SE Asian terranes / Geological Society, London, Special Publications, 106:97-122, doi:10.1144/GSL.SP.1996.106.01.09 --- Gordon Packham: Cenozoic SE Asia: reconstructing its aggregation and reorganization / Geological Society, London, Special Publications, 106:123-152, doi:10.1144/GSL.SP.1996.106.01.10 --- Robert Hall: Reconstructing Cenozoic SE Asia / Geological Society, London, Special Publications, 106:153-184, doi:10.1144/GSL.SP.1996.106.01.11 --- T. O. Simandjuntak and A. J. Barber: Contrasting tectonic styles in the Neogene orogenic belts of Indonesia / Geological Society, London, Special Publications, 106:185-201, doi:10.1144/GSL.SP.1996.106.01.12 --- Bryan Richter and Michael Fuller: Palaeomagnetism of the Sibumasu and Indochina blocks: implications for the extrusion tectonic model / Geological Society, London, Special Publications, 106:203-224, doi:10.1144/GSL.SP.1996.106.01.13 --- Robert B. Stokes, Paul F. Lovatt Smith, and Ko Soumphonphakdy: Timing of the Shan-Thai-Indochina collision: new evidence from the Pak Lay Foldbelt of the Lao PDR / Geological Society, London, Special Publications, 106:225-232, doi:10.1144/GSL.SP.1996.106.01.14 --- Paul F. Lovatt Smith, Robert B. Stokes, Charlie Bristow, and Andrew Carter: Mid-Cretaceous inversion in the Northern Khorat Plateau of Lao PDR and Thailand / Geological Society, London, Special Publications, 106:233-247, doi:10.1144/GSL.SP.1996.106.01.15 --- Charles S. Hutchison: The ‘Rajang accretionary prism’ and ‘Lupar Line’ problem of Borneo / Geological Society, London, Special Publications, 106:247-261, doi:10.1144/GSL.SP.1996.106.01.16 --- Shariff A. K. Omang and A. J. Barber: Origin and tectonic significance of the metamorphic rocks associated with the Darvel Bay Ophiolite, Sabah, Malaysia / Geological Society, London, Special Publications, 106:263-279, doi:10.1144/GSL.SP.1996.106.01.17 --- Khalid Ngah, Mazlan Madon, and H. D. Tjia: Role of pre-Tertiary fractures in formation and development of the Malay and Penyu basins / Geological Society, London, Special Publications, 106:281-289, doi:10.1144/GSL.SP.1996.106.01.18 --- H. D. Tjia and K. K. Liew: Changes in tectonic stress field in northern Sunda Shelf basins / Geological Society, London, Special Publications, 106:291-306, doi:10.1144/GSL.SP.1996.106.01.19 --- Ben Clennell: Far-field and gravity tectonics in Miocene basins of Sabah, Malaysia / Geological Society, London, Special Publications, 106:307-320, doi:10.1144/GSL.SP.1996.106.01.20 --- W. J. McCourt, M. J. Crow, E. J. Cobbing, and T. C. Amin: Mesozoic and Cenozoic plutonic evolution of SE Asia: evidence from Sumatra, Indonesia / Geological Society, London, Special Publications, 106:321-335, doi:10.1144/GSL.SP.1996.106.01.21 --- M. A. Samuel and N. A. Harbury: The Mentawai fault zone and deformation of the Sumatran Forearc in the Nias area / Geological Society, London, Special Publications, 106:337-351, doi:10.1144/GSL.SP.1996.106.01.22 --- Koji Wakita, Jan Sopaheluwakan, Kazuhiro Miyazaki, Iskandar Zulkarnain, and Munasri: Tectonic evolution of the Bantimala Complex, South Sulawesi, Indonesia / Geological Society, London, Special Publications, 106:353-364, doi:10.1144/GSL.SP.1996.106.01.23 --- Moyra E. J. Wilson and Dan W. J. Bosence: The Tertiary evolution of South Sulawesi: a record in redeposited carbonates of the Tonasa Limestone Formation / Geological Society, London, Special Publications, 106:365-389, doi:10.1144/GSL.SP.1996.106.01.24 --- Steven C. Bergman, Dana Q. Coffield, James P. Talbot, and Richard A. Garrard: Tertiary Tectonic and magmatic evolution of western Sulawesi and the Makassar Strait, Indonesia: evidence for a Miocene continent-continent collision / Geological Society, London, Special Publications, 106:391-429, doi:10.1144/GSL.SP.1996.106.01.25 --- Jason R. Ali, John Milsom, Edward M. Finch, and Bundan Mubroto: SE Sundaland accretion: palaeomagnetic evidence of large Plio-Pleistocene thin-skin rotations in Buton / Geological Society, London, Special Publications, 106:431-443, doi:10.1144/GSL.SP.1996.106.01.26 --- P Z. Vroon, M. J. Van Bergen, and E. J. Forde: Pb and Nd isotope constraints on the provenance of tectonically dispersed continental fragments in east Indonesia / Geological Society, London, Special Publications, 106:445-453, doi:10.1144/GSL.SP.1996.106.01.27 --- Kees Linthout, Henk Helmers, Jan R. Wijbrans, and Jan Diederik A. M. Van Wees: 40Ar/39Ar constraints on obduction of the Seram ultramafic complex: consequences for the evolution of the southern Banda Sea / Geological Society, London, Special Publications, 106:455-464, doi:10.1144/GSL.SP.1996.106.01.28 --- Tim R. Charlton: Correlation of the Salawati and Tomori Basins, eastern Indonesia: a constraint on left-lateral displacements of the Sorong fault zone / Geological Society, London, Special Publications, 106:465-481, doi:10.1144/GSL.SP.1996.106.01.29 --- Jeffrey F. A. Malaihollo and Robert Hall: The geology and tectonic evolution of the Bacan region, east Indonesia / Geological Society, London, Special Publications, 106:483-497, doi:10.1144/GSL.SP.1996.106.01.30 --- Simon Baker and Jeffrey Malaihollo: Dating of Neogene igneous rocks in the Halmahera region: arc initiation and development / Geological Society, London, Special Publications, 106:499-509, doi:10.1144/GSL.SP.1996.106.01.31 --- M. Pubellier, R. Quebral, M. Aurelio, and C. Rangin: Docking and post-docking escape tectonics in the southern Philippines / Geological Society, London, Special Publications, 106:511-523, doi:10.1144/GSL.SP.1996.106.01.32 --- P. V. Crowhurst, K. C. Hill, D. A. Foster, and A. P. Bennett: Thermochronological and geochemical constraints on the tectonic evolution of northern Papua New Guinea / Geological Society, London, Special Publications, 106:525-537, doi:10.1144/GSL.SP.1996.106.01.33 --- Helmut Wopfner: Gondwana origin of the Baoshan and Tengchong terranes of west Yunnan / Geological Society, London, Special Publications, 106:539-547, doi:10.1144/GSL.SP.1996.106.01.34 --- Zuyi Zhou, Qiuyuan Lao, Huanjiang Chen, Sijiang Ding, and Zhongting Liao: Early Mesozoic orogeny in Fujian, southeast China / Geological Society, London, Special Publications, 106:549-556, doi:10.1144/GSL.SP.1996.106.01.35
    Seiten: Online-Ressource (XIII, 566 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1897799527
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  • 32
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: In the W Hoggar (Algeria), the major transcurrent N–S East Ouzzal shear zone (EOSZ) hosts several world-class gold deposits over a 100-km length. The late Pan-African EOSZ separates two contrasting Precambrian domains: the Archaean In Ouzzal block to the west (orthogneisses with subordinate metasediments, reworked and granulitized in the c. 2 Ga Eburnean event) and a Middle Proterozoic block to the east (again orthogneisses and metasediments, involved in the c. 600 Ma Pan-African event).The EOSZ is a mylonite belt, 1–3 km wide, with a 50-m-wide ultramylonite belt hosting numerous quartz veins and lenses (giant hydrothermal quartz system) associated with a quartz-sericite-pyrite-carbonate (beresite) alteration. These hydrothermal events occurred under ductile (evolving towards brittle) conditions, between 500 and 300 MPa, at 500–300°C, with aqueous-carbonic fluids derived both from underlying devolatilized metamorphic rocks and a mantle source, as recorded by stable (C, O) isotope data. No gold mineralization was associated with these typical mesothermal events.Following a pressure drop (to 130 MPa), related to the inception of extensional tectonics, the EOSZ was later percolated by a new set of hydrothermal fluids, evolved from basinal waters that deeply penetrated into the In Ouzzal basement. These fluids were Ca-bearing brines (up to 25% wt. eq. NaCl), characterized by high δD (-9 to + 18‰ range), mobilized by the thermal energy released by the late Pan-African granite magmatism (Taourirt granites).As demonstrated by Pb isotope data, the brines leached Au from the In Ouzzal granulites (which contain 3 ppb Au). Fluid inclusion studies indicate that gold was deposited from these brines in the EOSZ at a depth of c. 5 km, due to mixing and cooling with descending diluted fluids.
    Materialart: Digitale Medien
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  • 33
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd.
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Migmatitic, granulite-grade mafic gneisses make up a significant part of the Kapuskasing Structural Zone (KSZ), Ontario. Although they contain a common mineral assemblage [hornblende (Hbl)+plagioclase (Pl)+diopside (Di)±garnet (Grt)+quartz (Qtz)±titanite (Ttn)], the mafic gneisses show wide variations in modal mineralogy from hornblende-rich to diopside+garnet-rich varieties and all gradations between. Up to 25 vol.% segregated plagioclase+quartz-rich (trondhjemitic) leucosome (Tdh) is intimately associated with the mafic gneiss, occurring in a continuum of patches, veins and transecting dykes at scales ranging from decimetres to micrometres. The texture and composition of the leucosome, combined with P-T  estimates for the host rocks above the solidus, suggest it represents crystallized trondhjemitic melt. Quartz is mainly restricted to the segregated leucosomes but more rarely occurs in a variety of interstitial textures in the mafic gneiss, suggesting that it crystallized from a melt phase rather than having been present as a solid phase at peak metamorphic conditions. Modal and textural data indicate a reaction relationship of the form: Hbl+Pl(+Qtz?)=Grt+Di+Ttn+leucosome (Tdh), implying that the granulite-forming process involved dehydration melting of an amphibolite protolith. Pressure-temperature estimates from Grt+Di+Pl+Qtz geothermobarometry are 9 kbar and 685-735 °C; however, based on experimental studies of dehydration melting of amphibolite, we estimate that peak conditions were closer to 11 kbar, 850 °C. Mass balance analysis, using the technique of singular value decomposition, and reaction space analysis were used to quantify the reaction and to determine the controls on reaction progress. The following mass balance provides a model for the natural reaction:1.00 Hbl+0.92 Pl+3.76 Qtz=1.14 Grt+1.54 Di+0.21 Ttn+1.49 Tdh+0.14 ‘pg’+0.39 Fe−1Mg+0.33 NaSiCa−1Al−1where ‘pg’ is a pargasite-like exchange. In all model mass balances tested, quartz is a reactant with a large coefficient. We argue that the abundance of quartz in the amphibolite protolith was the primary control on the differing extents of reaction observed. Mineral compositional variation exerted a secondary control on reaction progress, with Fe-richer layers containing An-richer plagioclase and more actinolitic amphibole reacting earliest (i.e. at lowest temperatures). Comparison of the calculated amount of melt produced in the gneisses with that now observed implies expulsion of 5–30% of the melt. These volumes are similar to those predicted from REE modelling of Archaean tonalities and trondhjemites from a garnet amphibolite source, suggesting that the KSZ mafic gneisses may be representative of partially depleted source rocks for trondhjemite-tonalite generation.
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  • 34
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd.
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Empirical data on quartz subgrain patterns from various metamorphic rocks show that, at least up to 10 kbar in the stability field of low-quartz, prismatic subgrain boundaries are dominant whereas basal subgrain boundaries are not developed. In the high-quartz stability field, both prismatic and basal subgrain boundaries occur and form typical rectangular (‘chessboard’) patterns. The likely reason behind the different occurrence of these subgrain patterns is that in high-quartz prismatic glide becomes as easy as, or probably even easier than, basal glide. The two types of subgrain patterns can be clearly distinguished by optical microscopy. Consequently, the occurrence of chessboard subgrain patterns in quartz represents a practicable geothermobarometer. The possibilities of its application are far reaching and include the specification of deformation conditions at high-grade metamorphism, the recognition of syntectonic intrusions and the distinction between pluton emplacement at lower and at higher crustal levels.
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  • 35
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd.
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Granitic magmas migrated through Early Proterozoic middle–lower crust at Mt Hay, central Australia, via a diverse network of narrow structurally controlled channelways, during a period of progressive W–SW-directed thrusting (D1a–D1d). They utilized existing folds, boudins and shear zones, or created new channels by magmatic fracture either parallel to layering or, rarely, in irregular arrays. The magmas rose obliquely, parallel to the plunging (50–60°) regional elongation direction, which was defined by coaxial folds, boudin necks and a strong mineral-elongation lineation. Megacrystic charnockitic magmas migrated through metre-scale conduits during D1a–D1b, but leucosomes were generally restricted to smaller (centimetre-scale) structures that existed throughout the entire deformation history. Thus, D1a/D1b leucosomes were potential feeders of in situ partial melts to the adjacent larger conduits of charnockite magma, thereby providing a pervasive interconnected network that allowed efficient migration of all magma types during the early stages of thrusting.The upper–middle crust of the Anmatjira–Reynolds Range area contains abundant megacrystic granitoid sheets that are of similar age and geochemistry to those at Mt Hay. They are considered to have formed as syntectonic intrusions emplaced during W–SW-directed thrusting, as at Mt Hay, suggesting that granitic magmas formed near the base of the continental crust passed through the mid-lower crustal level (25–30 km) exposed at Mt Hay and accumulated, in batholithic proportions, at shallower crustal levels (12–20 km) such as the Anmatjira–Reynolds Range area.The observations imply that granitoid magmas in the deep crust are capable of pervasive migration through the crust during major compressive, noncoaxial shear deformation. Localization of magmas by sequentially developed, narrow, compressive structures suggests that dilatancy followed successive foliation-forming events, a situation that can occur during steady-state deformation if the effective confining pressures are low, which would be a result of high and possibly variable rates of magma influx. The inferred rapid melt segregation and migration during deformation suggest that large chambers do not form until magma reaches neutral buoyancy in the middle to upper continental crust.
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  • 36
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Calcsilicate xenoliths occur in large numbers in some lavas and pyroclastic flows of Lascar Volcano. Their whole-rock major element and REE compositions indicate that the protolith was the Upper Cretaceous Yacoraite Formation, which crops out extensively in NW Argentina. The whole-rock major element compositions of the xenoliths fall into specific groups suggesting a strong geochemical zonation in the skarn zone. Three geochemical zones have been identified; (1) an outer metamorphic zone rich in wollastonite; (2) a middle zone rich in pyroxene and garnet; (3) an inner zone rich in pyroxene and magnetite. The two innermost zones have developed from the wollastonite zone by infiltration of metasomatic fluids rich in Fe, Mn, Mg, Ti and Al. Whole-rock REE patterns have not changed significantly during prograde metamorphism and metasomatism, indicating REE immobility in the altering fluids. Retrograde alteration by acid-sulphate fluids produced anhydrite skarns and secondary calcite and wilkeite veins in the wollastonite zone. The carbon and oxygen isotopic compositions of this calcite indicate that it formed by Rayleigh crystallization from a low-temperature (〈200 °C) fluid containing dissolved H2CO3. The calculated δ18O of the water in this fluid suggests a magmatic origin whereas the calculated δ13C of the dissolved carbonate is consistent with derivation from rocks of the Yacoraite Formation at 350 °C. It is suggested that the magmatic acid-sulphate fluid was responsible for leaching carbonate from the surrounding carbonate rocks and redepositing it in the skarn zone. REEs were mobilized during the retrograde acid-sulphate and acid-carbonate alteration. A negative Ce anomaly associated with this carbonate and sulphate indicates high oxygen fugacities in the mineralizing fluids.
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  • 37
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: In progressing from a granitoid mylonite to an ultramylonite in the Brevard shear zone in North Carolina, Ca and LOI (H2O) increase, Si, Mg, K, Na, Ba, Sr, Ta, Cs and Th decrease, while changes in Al, Ti, Fe, P, Sc, Rb, REE, Hf, Cr and U are relatively small. A volume loss of 44% is calculated for the Brevard ultramylonite relative to an Al–Ti–Fe isocon. The increase in Ca and LOI is related to a large increase in retrograde epidote and muscovite in the ultramylonite, the decreases in K, Na, Si, Ba and Sr reflect the destruction of feldspars, and the decrease in Mg is related to the destruction of biotite during mylonitization. In an amphibolite facies fault zone separating grey and pink granitic gneisses in the Hope Valley shear zone in New England, compositional similarity suggests the ultramylonite is composed chiefly of the pink gneisses. Utilizing an Al–Ti–Fe isocon for the pink gneisses, Sc, Cr, Hf, Ta, U, Th and M-HREE are relatively unchanged, Si, LOI, K, Mg, Rb, Cs and Ba are enriched, and Ca, Na, P, Sr and LREE are lost during deformation. In contrast to the Brevard mylonite, the Hope Valley mylonite appears to have increased in volume by about 70%, chiefly in response to an introduction of quartz.Chondrite-normalized REE patterns of granitoids from both shear zones are LREE-enriched and have prominent negative Eu anomalies. Although REE increase in abundance in the Brevard ultramylonites (reflecting the volume loss), the shape of the REE pattern remains unchanged. In contrast, REE and especially LREE decrease in abundance with increasing deformation of the Hope Valley gneisses. Mass balance calculations indicate that ≥95% of the REE in the Brevard rocks reside in titanite. In contrast, in the Hope Valley rocks only 15–40% of the REE can be accounted for collectively by titanite, apatite and zircon. Possible sites for the remaining REE are allanite, fluorite or grain boundaries. Loss of LREE from the pink gneisses during deformation may have resulted from decreases in allanite and perhaps apatite or by leaching ofy REE from grain boundaries by fluids moving through the shear zone.Among the element ratios most resistant to change during mylonitization in the Brevard shear zone are La/Yb, Eu/Eu*, Sm/Nd, La/Sc, Th/Sc, Th/Yb, Cr/Th, Th/U and Hf/Ta, whereas the most stable ratios in the Hope Valley shear zone are K/Rb, Rb/Cs, Th/U, Eu/Eu*, Th/Sc, Th/Yb, Sm/Nd, Th/Ta, Hf/Ta and Hf/Yb. However, until more trace element data are available from other shear zones, these ratios should not be used alone to identify protoliths of deformed rocks.
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  • 38
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Oppositely concave microfolds (OCMs) in and adjacent to porphyroblasts can be classified into five nongenetic types. Type 1 OCMs are found in sections through porphyroblasts with spiral-shaped inclusion trails cut parallel to the spiral axes, and commonly show closed foliation loops. Type 2 OCMs, commonly referred to as ‘millipede’ microstructure, are highly symmetrical, the foliation folded into OCMs being approximately perpendicular to the overprinting foliation. Type 3 OCMs are similar to Type 2, but are asymmetrical, the foliation folded into OCMs being variably oblique to the overprinting foliation. Type 4 OCMs are highly asymmetrical, only one foliation is present, and this foliation is parallel to the local shear plane. Type 5 OCMs result from porphyroblast growth over a microfold interference pattern.Types 1 and 2 are commonly interpreted as indicating highly noncoaxial and highly coaxial bulk deformation paths, respectively, during porphyroblast growth. However, theoretically they can form by any deformation path intermediate between bulk coaxial shortening and bulk simple shearing. Given particular initial foliation orientation and timing of porphyroblast growth, Type 3 OCMs can also form during these intermediate deformation paths, and are commonly found in the same rocks as Type 2 OCMs. Type 4 OCMs may indicate highly noncoaxial deformation during porphyroblast growth, but may be difficult to distinguish from Type 3 OCMs. Thus, Types 1–3 (and possibly 4) reflect the finite strain state, giving no information about the rotational component of the deformation(s) responsible for their formation. Furthermore, there is a lack of unequivocal independent evidence for the degree of noncoaxiality of deformation (s) during the growth of porphyroblasts containing OCMs. Type 2 OCMs that occur independently of porphyroblasts or other rigid objects might indicate highly coaxial bulk shortening, but there is a lack of supporting physical or computer modelling.It is possible that microstructures in the matrix around OCMs formed during highly noncoaxial and highly coaxial deformation histories might have specific characteristics that allow them to be distinguished from one another. However, determining degrees of noncoaxiality from rock fabrics is a major, longstanding problem in structural geology.
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  • 39
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Ion probe traverses across garnets from peridotites of the Caledonides of Norway and the Variscides of Poland show zoning patterns for Y, V, Zr, Cr, Ti and the REE. The complexly zoned patterns of garnets from the Bystrzyca Górna peridotite, Poland, are interpreted in terms of a changing P–T history (isobaric cooling followed by decompression and cooling). Weak rimward gradients in REE concentrations in garnets from the Almklovdalen and Sandvika peridotites, Norway, may be relicts of the original growth history of the garnets, but the nearly flat Y, V, Zr, Cr and Ti profiles from the same garnets imply a later period of near-homogenization at uniform P–T. Crushed garnet separates from each body were separated into three or more fractions on the assumption that density and magnetic susceptibility vary with Fe/Mg ratio, and Fe/Mg ratios change from garnet core to rim. Sm-Nd garnet–clinopyroxene ‘ages’ were determined for each fraction to determine whether they are also zoned. Four garnet fractions from the Góry Sowie peridotite give nearly the same ages (397–412 Ma) that are believed to span the interval of garnet growth. Garnet fractions from the Norwegian peridotites define scattered ages (816–1350 Ma) that are suspect, but hint at a Sveconorwegian equilibration event. The data indicate the Variscan and Norwegian peridotites had different histories, despite superficial mineralogical and tectonic similarities. Norwegian garnet peridotites had a long pre-Caledonian history and were extracted from a relatively cold mantle whereas the Variscan garnet peridotites had a comparatively short pre- or Eo-Variscan history and were extracted from a hot mantle.
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  • 40
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Paragonite-bearing amphibolites occur interbedded with a garbenschist-micaschist sequence in the Austroalpine Schneeberg Complex, southern Tyrol. The mineral assemblage mainly comprises paragonite + Mg-hornblende/tschermakite + quartz + plagioclase + biotite + ankerite + Ti-phase + garnet ± muscovite. Equilibrium P–T conditions for this assemblage are 550–600°C and 8–10 kbar estimated from garnet–amphibole–plagioclase–ilmenite–rutile and Si contents of phengitic muscovites. In the vicinity of amphibole, paragonite is replaced by symplectitic chlorite + plagioclase + margarite +± biotite assemblages. Muscovite in the vicinity of amphibole reacts to form plagioclase + biotite + margarite symplectites. The reaction of white mica + hornblende is the result of decompression during uplift of the Schneeberg Complex. The breakdown of paragonite + hornblende is a water-consuming reaction and therefore it is controlled by the availability of fluid on the retrogressive P–T path. Paragonite + hornblende is a high-temperature equivalent of the common blueschist-assemblage paragonite + glaucophane in Ca-bearing systems and represents restricted P–T conditions just below omphacite stability in a mafic bulk system. While paragonite + glaucophane breakdown to chlorite + albite marks the blueschist/greenschist transition, the paragonite + hornblende breakdown observed in Schneeberg Complex rocks is indicative of a transition from epidote-amphibolite facies to greenschist facies conditions at a flatter P–T gradient of the metamorphic path compared to subduction-zone environments. Ar/Ar dating of paragonite yields an age of 84.5 ± 1 Ma, corroborating an Eoalpine high-pressure metamorphic event within the Austroalpine unit west of the Tauern Window. Eclogites that occur in the Ötztal Crystalline Basement south of the Schneeberg Complex are thought to be associated with this Eoalpine metamorphic event.
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  • 41
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: The northern Dabie terrane consists of a variety of metamorphic rocks with minor mafic-ultramafic blocks, and abundant Jurassic-Cretaceous granitic plutons. The metamorphic rocks include orthogneisses, amphibolite, migmatitic gneiss with minor granulite and metasediments; no eclogite or other high-pressure metamorphic rocks have been found. Granulites of various compositions occur either as lenses, blocks or layers within clinopyroxene-bearing amphibolite or gneiss. The palaeosomes of most migmatitic gneisses contain clinopyroxene; melanosomes and leucosomes are intimately intermingled, tightly folded and may have formed in situ. The granulites formed at about 800–830 °C and 10–14 kbar and display near-isothermal decompression P–T paths that may have resulted from crust thickened by collision. Plagioclase-amphibole coronae around garnets and matrix PI + Hbl assemblages from mafic and ultramafic granulites formed at about 750–800 °C. Partial replacement of clinopyroxene by amphibole in gneiss marks amphibolite facies retrograde metamorphism. Amphibolite facies orthogneisses and interlayered amphibolites formed at 680–750 °C and c. 6 kbar. Formation of oligoclase + orthoclase antiperthite after plagioclase took place in migmatitic gneisses at T ≤ 490°C in response to a final stage of retrograde recrystallization. These P–T estimates indicate that the northern Dabie metamorphic granulite-amphibolite facies terrane formed in a metamorphic field gradient of 20–35 °C km-1 at intermediate to low pressures, and may represent the Sino-Korean hangingwall during Triassic subduction for formation of the ultrahigh- and high-P units to the south. Post-collisional intrusion of a mafic-ultramafic cumulate complex occurred due to breakoff of the subducting slab.
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  • 42
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: With increasing temperature during prograde metamorphism reactions will occur first at the lithological contacts of mixed pelite and calcsilicate terranes. At these interfaces, a fluid of lower chemical potential of H2O and CO2 than that required to produce a fluid in either layer can be produced whether reaction is caused by fluid infiltration or is initially fluid absent. If the interface region does not allow fluid transport then as temperature increases, a fluid pressure greater than lithostatic can develop. At some degree of over-pressure relative to rock pressure, the fluid hydraulically fractures the rock and a gradient in fluid composition away from the contact can be produced. These phenomena occur at the compositional interfaces whenever univariant reactions in the differing layers cross on a temperature vs. mole fraction of CO2 diagram with slopes of opposite sign. The first occurrence of these reaction products at lithological contacts delineates an isograd that defines temperature as well as the mole fraction of CO2 at constant pressure in systems open to fluid transport. These isograds can be contrasted with fluid-producing isograds in closed systems. As an illustration of possible effects, the reactions quartz + clinozoisite + muscovite = anorthite + K-feldspar + H2O and phlogopite + quartz + calcite = tremolite + K-feldspar + H2O + CO2 at 4 kbar are analysed and equations for fluid production and transport are developed.
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  • 43
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: The In Ouzzal terrane (IOT) or In Ouzzal granulite unit (IOGU) is an elongated Palaeoproterozoic block within the Neoproterozoic Pan-African belt of north-west Africa. The granulites derive from Archaean protoliths that include a large volume of metasediments which were deposited on a 3.2-Ga gneissic basement. Near-peak granulite facies conditions between 2.17 and 2 Ga were estimated at P=10 kbar and T rising from 800 to 1000°C. Premetamorphic orthogneisses were intruded at 2.5 Ga, and followed by the emplacement of syn- to late-kinematic charnockites, syenites and carbonatites at around 2 Ga. Cooling of the granulites occurred till 1800 Ma. Shortly after its exhumation coeval with crustal extension and related alkaline magmatism in adjacent areas, the IOT was buried beneath late Palaeoproterozoic and Neoproterozoic cover sequences, and then behaved as a rigid block. Both margins are lithospheric faults, as evidenced by the occurrence of shear-zone-related mafic and felsic plutons. Pan-African tectonothermal events were negligible in the north, but granulites in the south were significantly reworked under lower greenschist facies conditions during the northern motion of the block with respect to both the western and the eastern Pan-African terranes. The Cambrian molasse, associated with widespread alkaline volcanism and subvolcanic granites, is horizontal in the north. The IOT, which was part of a larger continental mass including its counterpart in northern Mali, is interpreted as an exotic terrane which may have docked during Pan-African plate convergence and lateral collision. The unchanged pediplain since c. 1.7 Ga in the north suggests that the IOT is underlain by thick Palaeoproterozoic lithospheric mantle, whereas its southern part is probably allochthonous and overlies Pan-African structural units.
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  • 44
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 45
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Al-Mg granulites, with cordierite, garnet, sapphirine, orthopyroxene, sillimanite, spinel, phlogopite, K-feldspar, plagioclase and variable quartz from Ihouhaouene (In Ouzzal, Algeria), display a range of decompression textures involving the breakdown of orthopyroxene and sillimanite, and of garnet. The succession of parageneses suggests that the P–T–t evolution corresponds to decompression with cooling from peak conditions of about 950°C and 10 kbar. This decompression path is obtained from the paragenetic analysis in the FMAS system. However, according to current KFMASH grids, this P–T–t evolution should take place outside the stability field of phlogopite+quartz; yet this assemblage is probably stable during most of the P-T evolution, notably during peak metamorphism. This discrepancy is interpreted as the effect of the high content of F in phlogopite which should shift its stability limit towards higher temperature. The consequences of this shift on the phase relationships in the KFeMASH system are investigated and it is concluded that a topological inversion could exist in the F-bearing system.
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  • 46
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Quartz Al–Mg granulites exposed at In Hihaou, In Ouzzal (NW Hoggar), preserve an unusual high-grade mineral association stable at temperatures up to 1050°C, involving the parageneses orthopyroxene–sillimanite–garnet–quartz, sapphirine–quartz and spinel–quartz. The phase relationships within the FMAS system show that a continuum exists between the earlier prograde reaction textures and those of the later decompressive event. The following mineral reactions involving sillimanite are deduced: (1) Grt+Qtz→Opx+Sil, (2) Opx+Sil→Grt+Spr+Qtz, (3) Grt+Sil+Qtz→Crd, (4) Grt+Sil→Crd+Spr, (5) Grt+Sil+Spr→Crd+Spl, (6) Grt+Sil→Crd+Spl, (7) Grt+Crd+Sil→Spl+Qtz and (8) Grt+Sil→Spl+Qtz. Minerals in quartz Al–Mg granulites display compositional variations consistent with the observed reactions. The Mg/(Mg+Fe2+) range of the main minerals is as follows: cordierite (0.81–0.97), sapphirine (0.77–0.88), orthopyroxene (0.65–0.81), garnet (0.33–0.64) and spinel (0.23–0.56). The reaction textures and the evolution of the mineral assemblages in the quartz Al–Mg granulites indicate a clockwise P–T trajectory characterized by peak conditions of at least 10 kbar and 1050°C, followed by decompression from 10 to 6 kbar at a temperature of at least 900°C.
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  • 47
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Many thermodynamic calculations relating to metamorphic rocks hinge on the thermodynamic parameters of garnet. Though some models are widely used, it is not clear whether their underlying premise is correct: that a single set of equations can be written for the activities of the end-members of garnet covering the whole compositional range. A voluminous body of data can be used to constrain the thermodynamics of garnet, namely Fe–Mg exchange experimental data involving garnet and another mineral, particularly clinopyroxene, orthopyroxene and olivine. However, examination of these data reveals inconsistencies, apparently stemming from differences between the thermodynamics of low-Ca and high-Ca garnets, with a boundary of about XgCa= 0.15. In the two regions, for the high P–T of the experimental data, the thermodynamics follow the regular model, with values for the interaction parameters in the low Ca region of about wgFeMg= 50R and waFe–wgMgCa=– 1300R, in which R is the gas constant, and in the high Ca region of about wgFeMg= 1100R and wgCaFe–wgMgCa=– 2200R. Using the subregular, rather than the regular, model does not remove the discrepancy. The cause of the discrepancy needs to be identified if reliable calculations on rocks are to be made.
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  • 48
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: In the Hlinsko region (Variscan Bohemian Massif, Czech Republic) a major extensional shear zone separates low-grade metasedimentary series (Hlinsko schists) and high-grade rocks of the Moldanubian terrane (Svratka Crystalline Unit). During late-Variscan extension, a tonalite intruded syntectonically into the normal ductile shear zone, and caused contact metamorphism of the overlying schists. Concurrent syntectonic sedimentation of a flysch series took place at the top of the hangingwall schists. In order to decipher the detailed petrological evolution of the Hlinsko unit situated in the hangingwall of this tectonic contact, a phase diagram approach and petrogenetic grids, calculated with the thermocalc computer program, were used.The crystallization/deformation relationships and the paragenetic analysis of the Hlinsko schists define a P–T path with an initial minor increase in pressure followed by cooling. Calculated pseudosections constrain this anticlockwise P-T evolution to the upper part of the andalusite field between 0.36 and 0.40 GPa for temperatures ranging from 570 to 530°C. A low aH2O is required to explain the presence of andalusite-biotite-bearing assemblages, and could be related to the presence of abundant graphite.In contrast, the footwall rocks of the Svratka Crystalline Unit record decompression from around 0.8 GPa at a relatively constant temperature, followed by cooling. Thus, the footwall and the hangingwall units display opposite, but convergent P–T histories. Decompression in the footwall rocks is related to a rapid exhumation. We propose that the inverse, anticlockwise P–T path recorded in the hangingwall pelites is related to the rapid, extension-controlled sedimentation of the overlying flysch series.
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  • 49
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd.
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Two high-grade gneissic complexes of the Western Sudetes, the Góry Sowie Block and the Śnieżnik area complex, contain small, predominantly felsic granulitic inliers with minor Cpx-bearing intercalations. The P–T  conditions of the granulite facies events and of the subsequent re-equilibration are estimated using the ternary feldspar thermometer and the Geo-Calc computer program (version TWQ, Jan 92).In the Góry Sowie granulites, the peak granulitic event occurred at c. 18–20 kbar and 900 °C, and the late decompressive re-equilibration within a range of 4–10 kbar and temperatures decreasing to 600–700 °C. The latter event is thought to have coincided with the main metamorphic phase in the surrounding gneisses.The P–T  estimates are more scattered in the Śnieżnik granulites, but the peak conditions for the granulitic event are estimated at pressure over 22 kbar (possibly around 30 kbar) and temperature exceeding 900 °C. The analysed samples from the Śnieżnik area bear no significant evidence of lower-pressure re-equilibration.Integrating the thermobarometric data and some age constraints indicates that the Góry Sowie granulites belong to the early stage ‘type I’ granulites of the Variscan Belt (c. 400 Ma old), which are interpreted as fragments of continental crustal materials subducted to mantle depths in the earliest stages of the Variscan orogeny. The Śnieżnik granulites are more problematic; they may belong to a ‘younger high-P suite’ (c. 350 Ma old), widespread in the southern and eastern parts of the Bohemian Massif, and possibly related to the climax of the Variscan continent–continent collision.
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  • 50
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd.
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Cretaceous granulite facies metamorphism in the Fiordland area of New Zealand has distinctive mineralogical, textural and structural features that set it apart from most other regional metamorphic belts. The metamorphism, developed over a 30×150-km area and the consequence of a 20-km-thick increment to crustal thickness, is closely associated in space and time with a large plutonic complex, the Western Fiordland Orthogneiss (WFO). Although temperatures and pressures as high as 700 °C and 12 kbar were attained, the metamorphic overprint on earlier low-pressure assemblages is weak and incomplete. Little strain accompanied the metamorphism. The temperature threshold at which metamorphic recrystallization is recorded is over 500 °C. Zoned garnets are preserved at unusually high temperatures, indicating duration of metamorphism on the order of 10 times shorter than in most other regional terranes. This pattern of features bears close similarity to metamorphism in the Coast Plutonic Complex in North America, where a mechanism of ‘magma loading’ has been invoked. In Fiordland, the high-pressure metamorphism can be explained by depression of country rock under a crustal zone that is inflated by intrusion of the WFO. Regional structure of the WFO as a horizontally sheeted complex suggests that the pluton was emplaced by vertical displacement of country rock, and supports the magma loading model.
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  • 51
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Materialart: Digitale Medien
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  • 52
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Raman spectral analyses of carbonaceous material (CM) extracted from pelitic samples along two sections traversing the metamorphic belt of Taiwan were carried out in the present study. The results show similar spectral variations of CM with metamorphic grade as those documented in the literature. However, continuous sampling from zeolite facies through prehnite–pumpellyite facies to greenschist facies metamorphic rocks in the present study does reveal some interesting features on the Raman spectra of CM that were not noted before. Both the Raman D (disordered-)/O (ordered-) peak area (i.e. integrated intensity) ratio and the D/O peak width (i.e. full width at half maximum, FWHM) ratio of the CM decrease with progressive metamorphism, but the most prominent change in the D/O peak area ratio occurs in samples of lower greenschist facies metamorphic grade, while the most significant decrease in the D/O peak width ratio occurs in samples near the boundary of prehnite–pumpellyite facies and greenschist facies. This phenomenon is interpreted as a result of the decoupling of the changing rates of in-plane crystallite size and degree of defects of CM with progressive metamorphism. It is postulated that the Raman spectrum of CM can serve as a metamorphic grade indicator to distinguish samples of prehnite–pumpellyite facies metamorphic grade from those of greenschist facies metamorphic grade.
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  • 53
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Moderately manganiferous siliceous pelagites near Meyers Pass, Torlesse Terrane, South Canterbury, New Zealand, have been metamorphosed in the prehnite–pumpellyite facies. A conodont colour index measurement suggests T max in the range 190–300 °C. Porphyroblastic manganaxinite, manganoan pumpellyite, manganoan chlorite and trace spessartine-rich garnet and sphalerite have formed in an extremely fine-grained quartz–albite–berthierine–phengite–titanite groundmass. Porphyroblastic manganaxinite semischists and schists are distinctive rocks in prehnite–pumpellyite to lower-grade greenschist and blueschist facies of New Zealand and Japan. Mn in the manganoan pumpellyites substitutes for Ca in W sites. Total Fe/(Fe+Mg) ratios in chlorite are dependent on oxidation state, being ≤0.22 in red hematitic hemipelagites, and ≥0.61 in low-f O2 grey metapelagites. In the low-f O2 metapelagites, manganoan berthierine with little or no chlorite is inferred in the groundmass and iron-rich chlorite occurs as porphyroblasts and veinlets, whereas in the red rocks, Mg-rich chlorite occurs both in groundmasses and veinlets. Variably high Si in the manganoan chlorites correlates with evidence for contaminant phases. The Mn content of chlorite contributing to garnet growth is dependent on metamorphic grade; incipient spessartine indicates a saturation value of 6–8% MnO in chlorite in low-f O2 rocks at Meyers Pass. Lower MnO contents are recorded for otherwise analogous rocks with increasing metamorphic grade, but at a given grade coexisting chlorite and garnet are richer in Mn where f O2 is high. Manganaxinite and manganoan pumpellyite also contributed to reactions forming grossular–spessartine solid solutions. Formation of garnet in siliceous pelagites is dependent on both Mn and Ca content. The spessartine component increases with grade into the greenschist facies. Partial recrystallization of berthierine to chlorite and the growth of porphyroblastic patches of other minerals was facilitated by brittle fracture and access of fluids to an otherwise impermeable matrix; to this extent the very low-grade metamorphism was episodic.
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  • 54
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Carbon isotope fractionations between calcite and graphite in the Panamint Mountains, California, USA, demonstrate the importance of mass balance on carbon isotope values in metamorphosed carbon-bearing minerals while recording the thermal conditions during peak regional metamorphism. Interbedded graphitic marbles and graphitic calcareous schists in the Kingston Peak Formation define distinct populations on a δ13C(gr)–δ13C(cc) diagram. The δ13C values of both graphite and calcite in the marbles are higher than the values of the respective minerals in the schists. δ13C values in both rock types were controlled by the relative proportions of the carbon-bearing minerals: calcite, the dominant carbon reservoir in the marble, largely controlled the δ13C values in this lithology, whereas the δ13C values in the schists were largely controlled by the dominant graphite. This is in contrast to graphite-poor calcsilicate systems where carbon isotope shifts in carbonate minerals are controlled by decarbonation reactions.The marbles record a peak temperature of 531±30 °C of a Jurassic low-pressure regional metamorphic event above the tremolite isograd. In the schists there is a much wider range of recorded temperatures. However, there is a mode of temperatures at c. 435 °C, which approximately corresponds to the temperatures of the principal decarbonation metamorphic reactions in the schists, suggesting that the carbon exchange was set by loss of calcite and armouring of graphite by newly formed silicate minerals. The armouring may explain the relatively large spread of apparent temperatures. Although the modal temperature also corresponds to the approximate temperature of the Cretaceous retrograde event, retrograde exchange is thought less likely due to very slow exchange rates involving well-crystallized graphite, armouring of graphite by silicates during the earlier event, and because of other barriers to retrograde carbon exchange. Thus, only the calcite–graphite carbon isotope fractionations recorded by the marbles demonstrate the high-temperature conditions of the low-pressure Jurassic metamorphic event that was associated with the emplacement of granitic plutons to the west of the Panamint Mountains.
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  • 55
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Seventy-five spatially orientated, serial thin sections cut from a single rock containing ‘millipede’ porphyroblast microstructure from the Robertson River Metamorphics, Australia, reveal the three-dimensional (3-D) geometry of oppositely concave microfolds (OCMs) that define the microstructure. Electronic animations showing progressive serial sections of the 3-D microstructure are made available via the World Wide Web. The OCM amplitudes decrease regularly from a maximum in near-central sections to a minimum in near-marginal sections, whereas the OCM interlimb angles increase regularly from a minimum in near-central sections to a maximum in near-marginal sections. These observations illustrate that the OCMs are noncylindrical surfaces with culminations located in near-central sections. Because the porphyroblast cores appear to have been present before significant development of the syn-OCM foliation, all of the OCMs were formed by heterogeneous extension around these cores. The overall geometry of the OCMs described here reflects the strain state, and cannot be used to constrain deformation paths.
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  • 56
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: The high-grade migmatitic core to the southern Brittany metamorphic belt has mineralogical and textural features that suggest high-temperature decompression. The chronology of this decompression and subsequent cooling history have been constrained with 40Ar/39 Ar ages determined for multigrain concentrates of hornblende and muscovite prepared from amphibolite and late-orogenic granite sheets within the migmatitic core, and from amphibolite of the structurally overlying unit. Three hornblende concentrates yield plateau isotope correlation ages of c. 303–298 Ma. Two muscovite concentrates record well-defined plateau ages of c. 306–305 Ma. These ages are geologically significant and date the last cooling through temperatures required for intracrystalline retention of radiogenic argon. The concordancy of the hornblende and muscovite ages suggest rapid post-metamorphic cooling. Extant geochronology and the new 40Ar/39Ar data suggest a minimum time-integrated average cooling rate between c. 725 °C and c. 125 °C of c. 14 ± 4°C Ma-1, although below 600 °C the data permit an infinitely fast rate of cooling. Mineral assemblages and reaction textures in diatexite migmatites suggest c. 4 kbar decompression at 800–750 °C. This must have pre-dated the rapid cooling.Emplacement of two-mica granites into the metamorphic belt occurred between 345 and 300 Ma. The youngest plutons were emplaced synkinematically along shallow-dipping normal faults interpreted to be reactivated Eo-Variscan thrusts. A penetrative, west-plunging stretching lineation developed in these granites suggests that extension was orogen-parallel. Extension was probably related to regional uplift and gravitational collapse of thermally weakened crust during constrictional (escape) tectonics in this narrow part of the Variscan orogen. This followed slab breakoff during the terminal stages of convergence between Gondwana and Laurasia; detachment may have been consequent upon a change in kinematics leading to dextral displacement within the orogen. Dextral ductile strike-slip displacement was concentrated in granites emplaced synkinematically along the South Armorican Shear Zone. Rapid cooling is interpreted to have resulted from tectonic unroofing with emplacement of granite along decollement surfaces. The high-grade migmatitic core of the southern Brittany metamorphic belt represents a type of metamorphic core complex formed during orogen-parallel extensional unroofing and regional-scale ductile flow.
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  • 57
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Microstructural evidence commonly is used to infer metamorphic reactions, which are used to infer pressure–temperature–time (P–T–t) paths. However, this approach in low-P/high-T  (LPHT) granulite facies metamorphic terranes has two main problems. (1) Microstructural evidence may be inconclusive, so that reactions cannot be inferred with confidence. In particular, relative timing of mineral growth inferred from inclusions, moulding relationships and foliation–porphyroblast relationships is commonly ambiguous or invalid. The most reliable indicators of metamorphic reactions are partial pseudomorphs and corona structures, especially if symplectic intergrowths (indicating simultaneous growth of two or more minerals) are involved. (2) Even reactions that can be inferred with confidence do not indicate unique P–T  trends, owing to P–T  slopes of reaction curves. Where successive reactions can be shown to have occurred in the same rock, a line or curve joining reaction-curve intersections gives an apparent single-event path. However, isotopic evidence is needed to prove that polymetamorphism (involving more complex paths making fortuitous intersections with the apparent single-event path) did not occur. Although these problems are well known, their importance is not always emphasized in metamorphic investigations.The difficulties are illustrated by published work on P–T–t paths for Proterozoic LPHT granulite facies rocks of central Australia and Antarctica. Recent work in Antarctica has shown that P–T–t paths may be episodic and more complex than the simple, single-event paths commonly inferred from microstructural evidence alone.
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  • 58
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: A complete Barrovian sequence ranging from unmetamorphosed shales to sillimanite–K-feldspar zone metapelitic gneisses crops out in a region extending from the Hudson River in south-eastern New York state, USA, to the high-grade core of the Taconic range in western Connecticut. NNE-trending subparallel biotite, garnet, staurolite, kyanite, sillimanite and sillimanite–K-feldspar isograds have been identified, although the assignment of Barrovian zones in the high-grade rocks is complicated by the appearance of fibrolitic sillimanite at the kyanite isograd.Thermobarometric results and reaction textures are used to characterize the metamorphic history of the sequence. Pressure–temperature estimates indicate maximum metamorphic conditions of 475 °C, c. 3–4 kbar in the garnet zone to 〉720 °C, c. 5–6 kbar in the highest grade rocks exposed. Some samples in the kyanite zone record anomalous (low) peak conditions because garnet composition has been modified by fluid-assisted reactions.There is abundant petrographic and mineral chemical information indicating that the sequence (with the possible exception of the granulite facies zone) was infiltrated by a water-rich fluid after garnet growth was nearly completed. The truncation of fluid inclusion trails in garnet by rim growth or recrystallization, however, indicates that metamorphic reactions involving garnet continued subsequent to initial infiltration.The presence of these textures in some zones of a well-constrained Barrovian sequence allows determination of the timing of fluid infiltration relative to the P–T  paths. Thermobarometric results obtained using garnet compositions at the boundary between fluid–inclusion-rich and inclusion-free regions of the garnet are interpreted to represent peak metamorphic conditions, whereas rim compositions record slightly lower pressures and temperatures. Assuming that garnet grew during a single metamorphic event, infiltration must have occurred at or slightly after the peak of metamorphism, i.e. 4–5 kbar and a temperature of c. 525–550 °C for staurolite and kyanite zone rocks.
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  • 59
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd.
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Garnet crystals from low-pressure/high-temperature (LPHT) Ryoke metamorphic rocks in the Yanai district, south-western Japan, show several kinds of chemical zoning patterns that systematically vary with grain radius between c. 0.1 and 0.5 mm. Large grains (〉c. 0.4 mm) show normal zoning and small grains (〈c. 0.4 mm) show unzoned or reversely zoned cores. Observations of the chemical zoning and of the spatial and size distributions of the garnet grains between c. 0.1 and 0.5 mm in radius suggest that they were formed by continuous nucleation and diffusion-controlled growth.A previously estimated temperature–time path (T –t path) for the Ryoke metamorphism, using 1-D numerical simulation, is characterized by a rapid increase in temperature, 0.0017 °C yr−1 on average, and a period of high temperature (〉600 °C) shorter than 0.5 Myr, which was presumably caused by the intrusion of a granodiorite sheet. Chemical zoning of garnet grains with different radii simulated for the T –t path using a numerical model of continuous nucleation and diffusion-controlled growth, in combination with intracrystalline diffusion, compares well with the observed zoning patterns in garnet grains with different radii. This is in spite of the fact that the simulated zoning patterns vary greatly, depending on subtle differences in the T–t history. Therefore, they suggest that the T–tpath gives a good explanation for the LPHT Ryoke metamorphism. Although this study only refers to the Ryoke metamorphism, the technique may be applicable to thermal modelling of other metamorphic terranes.
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  • 60
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: The metasedimentary sequence of the Deep Freeze Range (northern Victoria Land, Antarctica) experienced high-T/low-F metamorphism during the Cambro-Ordovician Ross orogeny. The reaction Bt + Sil + Qtz = Grt + Crd + Kfs + melt was responsible for the formation of migmatites. Peak conditions were c. 700–750° C, c. 3.5–5 kbar and xH2Oc. 0.5).Distribution of fluid inclusions is controlled by host rock type: (1) CO2-H2O fluid inclusions occur only in graphite-free leucosomes; (2) CO2–CH4± H2O fluid inclusions are the most common type in leucosomes, and in graphite-bearing mesosomes and gneiss; and (3) CO2–N2–CH4 fluid inclusions are observed only in the gneiss, and subordinately in mesosomes.CO2–H2O mixtures (41% CO2, 58% H2O, 1% Nad mol.%) are interpreted as remnants of a synmig-matization fluid; their composition and density are compatible P–T–aH2O conditions of migmatization (c. 750° C, c. 4 kbar, xH2Oc. 0.5). CO2-H2O fluid in graphite-free leucosomes cannot originate via partial melting of graphite-bearing mesosomes in a closed system; this would have produced a mixed CO2–CH4 fluid in the leucosomes by a reaction such as Bt + Sil + Qtz + C ± H2O = Grt + Crd + Kfs + L + CO2+ CH4. We conclude that an externally derived oxidizing CO2-H2O fluid was present in the middle crust and initiated anatexis.High-density CO2-rich fluid with traces of CH4 characterizes the retrograde evolution of these rocks at high temperatures and support isobaric cooling (P–T anticlockwise path). In unmigmatized gneiss, mixed CO2–N2–CH4 fluid yields isochores compatible with peak metamorphic conditions (c. 700–750° C, c. 4–4.5 kbar); they may represent a peak metamorphic fluid that pre-dated the migmatization.
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  • 61
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Some granulites from the Amessmessa area (south In Ouzzal unit, Hoggar) contain the peak assemblage gedrite+garnet+sillimanite+quartz that was used to estimate the P–T conditions of metamorphism. The rocks developed symplectites and corona textures by the breakdown of the primary paragenesis to orthopyroxene, cordierite and spinel. The successive parageneses formed in separate microdomains according to a clockwise P–T path. Geothermometry, geobarometry and phase diagram calculations indicate that the textures formed by decompression and cooling from 7–9 kbar and 850–900°C to 3.5–4.5 kbar and 700–800°C. This P–T evolution is consistent with low to medium aH2O, between 0.4 and 0.7, and is similar to the metamorphic conditions deduced in Al–Mg granulites from the north of In Ouzzal.
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  • 62
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: The In Ouzzal Al–Mg granulites are found within sedimentary units deposited after 2.7 Ga, the whole association being metamorphosed under extreme temperature conditions (c. 1000 °C) at 2 Ga. The Al–Mg granulites are interlayered with other metasediments, including metapelites, quartzites and magnetite-bearing quartzites, forsterite-spinel marbles, and a few meta-igneous rocks (mainly pyroxenites). They do not occur at a specific position in the sedimentary suite, and they do not reflect any particular structural control.The major and trace element compositions of Al–Mg granulites (especially the high Cr, Ni, Co contents) show that their peculiar ‘refractory’ chemistry is more compatible with premetamorphic sedimentary characteristics rather than with metasomatic, metamorphic or partial melting processes. Sedimentary admixtures of a common mature detrital component coming from the weathering of the local acidic igneous crustal protoliths (normal pelitic component) with an extremely immature component derived from reworking of basic/ultrabasic lithologies (Al–Mg–Cr–Co–Ni–rich chloritic component) is consistent with the geochemistry of such rocks.As in other instances, the quartz-garnet oxygen isotopic thermometer here records an apparent temperature close to the peak metamorphism (c. 1000 °C). Although the persistence of pre-existing δ18O variations on a small scale during the metamorphism does not support a major pervasive fluid flow during metamorphism, it does not rule out the presence of syn- to post-metamorphic CO2. The low δ18O (c.+ 5 to + 6‰) of the most typical Al–Mg granulites indicate that the ‘chloritic component’ in these rocks was derived from hydrothermally altered mafic/ultramafic protoliths rather than dominantly from palaeosols. It is suggested that the presence of such Al–Mg–Cr–Co–Ni–rich sediments is indirect evidence for the presence of greenstone belts in the local crust of the In Ouzzal at 2.6–2.7 Ga.
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  • 63
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd.
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: The metamorphic core of the Himalaya in the Kali Gandaki valley of central Nepal corresponds to a 5-km-thick sequence of upper amphibolite facies metasedimentary rocks. This Greater Himalayan Sequence (GHS) thrusts over the greenschist to lower amphibolite facies Lesser Himalayan Sequence (LHS) along the Lower Miocene Main Central Thrust (MCT), and it is separated from the overlying low-grade Tethyan Zone (TZ) by the Annapurna Detachment. Structural, petrographic, geothermobarometric and thermochronological data demonstrate that two major tectonometamorphic events characterize the evolution of the GHS. The first (Eohimalayan) episode included prograde, kyanite-grade metamorphism, during which the GHS was buried at depths greater than c. 35 km. A nappe structure in the lowermost TZ suggests that the Eohimalayan phase was associated with underthrusting of the GHS below the TZ. A c. 37 Ma 40Ar/39Ar hornblende date indicates a Late Eocene age for this phase. The second (Neohimalayan) event corresponded to a retrograde phase of kyanite-grade recrystallization, related to thrust emplacement of the GHS on the LHS. Prograde mineral assemblages in the MCT zone equilibrated at average T =880 K (610 °C) and P =940 MPa (=35 km), probably close to peak of metamorphic conditions. Slightly higher in the GHS, final equilibration of retrograde assemblages occurred at average T =810 K (540 °C) and P=650 MPa (=24 km), indicating re-equilibration during exhumation controlled by thrusting along the MCT and extension along the Annapurna Detachment. These results suggest an earlier equilibration in the MCT zone compared with higher levels, as a consequence of a higher cooling rate in the basal part of the GHS during its thrusting on the colder LHS. The Annapurna Detachment is considered to be a Neohimalayan, synmetamorphic structure, representing extensional reactivation of the Eohimalayan thrust along which the GHS initially underthrust the TZ. Within the upper GHS, a metamorphic discontinuity across a mylonitic shear zone testifies to significant, late- to post-metamorphic, out-of-sequence thrusting. The entire GHS cooled homogeneously below 600–700 K (330–430 °C) between 15 and 13 Ma (Middle Miocene), suggesting a rapid tectonic exhumation by movement on late extensional structures at higher structural levels.
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  • 64
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd.
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Mechanisms for kilometre-scale, open-system fluid flow during regional metamorphism remain problematic. Debate also continues over the degree of fluid flow channellization during regional metamorphism, and the mechanisms for pervasive fluid flow at depth. The requirements for pervasive long-distance fluid flow are an interconnected porosity and a large regional gradient in fluid pressure and hydraulic head (thermally or structurally controlled) that dominates over local perturbations in hydraulic head due to deformation. In contrast, dynamic or transient porosity interconnection and fluid flow accompanying deformation of heterogeneous rock suites should result in moderately to strongly channellized flow at a range of scales, of which there are many examples in the literature.Classification of fluid flow types based on scale and degree of equilibration between fluid and rock, wallrock permeability, and mode of fluid transport contributes to an understanding of key factors that control fluid flow. Closed-system fluid behaviour, with restricted fluid flow in microcracks or cracks and limited fluid–rock interaction, occurs over a range of strains and crustal depths, but requires low permeabilities and/or small fluid fluxes. Long-distance, open-system fluid flow in channels is favoured in heterogeneous rocks at high strains, moderate (but variable) permeabilities, and moderate to high fluid fluxes. Long-distance, broad, pervasive fluid flow during regional metamorphism requires that the rocks are not accumulating high strains and have high permeabilities, low permeability contrasts, and high fluid fluxes. The ideal situation for such fluid flow is in situations where the rocks are undergoing stress relaxation immediately after a major deformation phase. In the mid-crust, fairly specific conditions are thus required for pervasive fluid flow. During active orogenesis, structurally controlled fluid flow (with focused open systems surrounding regions of closed-system behaviour) predominates in most, but not all, regional metamorphic situations, at a range of scales.
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  • 65
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd.
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Garnets from recrystallized, staurolite- and kyanite-bearing mica schists from the central Saualpe basement, representing the host rocks of the type-locality eclogites, give concordant Sm–Nd garnet–whole-rock isochron ages between 88.5±1.7 and 90.9±0.7 Ma. The millimetre-sized, mostly inclusion-free grains show fairly homogeneous element profiles with pyrope contents of 25–27%. Narrow rims with an increase in Fe and Mn and a decrease in Mg document minor local re-equilibration during cooling. According to phengite geothermobarometry, peak metamorphic conditions at 90 Ma were close to 20 kbar and 680 °C and similar to those recorded by the eclogites. The garnet rims record about 575 °C/7 kbar for the final stages of metamorphism. A phengitic garnet–mica schist, sampled at the immediate contact with the Gertrusk eclogite, gave a garnet–whole-rock Sm–Nd age of 94.0±2.7 Ma.Garnet porphyroclasts separated from a pegmatite–mylonite of the Koralpe plattengneiss near Stainz are unzoned and show spessartine contents of 15%. Composition and Sm–Nd ages of close to 260 Ma point to a magmatic origin for these garnets.The garnet data from the Saualpe document an intense Alpine metamorphism for this part of the Austroalpine basement. The mica schists recrystallized during decompression and rapid exhumation, at the final stages of and immediately following a high-P event. The Koralpe data show that high Alpine temperatures did not reopen the Sm–Nd isotope system, implying a closure temperature in excess of c. 600 °C for this isotopic system in garnet.
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  • 66
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd.
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Metasedimentary gneisses show a rapid change in grade within a 10-km-wide low-P/high-T  regional aureole at Mt Stafford, Arunta Block, central Australia. Migmatites occur in all but the lowermost of five metamorphic zones, which are characterized by: (1) muscovite–quartz schist; (2) andalusite–cordierite–K-feldspar granofels with small melt segregations; (3) spinel–sillimanite–cordierite–K-feldspar migmatite; (4) garnet–orthopyroxene–cordierite migmatite and minor diatexite; and (5) biotite–cordierite–plagioclase diatexite that shows a transition to granite. A subsolidus unit comprising interbedded sandstone and siltstone is equivalent to bedded migmatite,the main rock type in Zones 2–4. Mesoscopic textures and migmatite classification of this unit vary with grade. In Zone 2, metatexite is developed in siltstone layers that are separated by quartz-rich, unmelted metapsammite layers. Melt segregation was less efficient in Zones 3 and 4, where the dominant migmatite layering is a modified bedding. High proportions of melt were present in Zone 4, in which schlieren migmatite is transitional between bedded migmatite and metapelite-sourced diatexite. The preservation of sedimentary structures and coexistence of melt reactants and products in Zone 4 metapelite imply that melting proceeded insitu without substantial migration of melt. Zone 5 biotite–cordierite–plagioclase diatexite carries rafts of bedded migmatite with strongly resorbed edges, as well as large K-feldspar and quartz augen. This unit of comparatively Ca-rich migmatites is inferred to have been formed by the mixing of locally derived and injected granitic melt.
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  • 67
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: One-dimensional fluid advection-dispersion models predict differences in the patterns of mineralogical and oxygen isotope resetting during up- and down-temperature metamorphic fluid flow that may, in theory, be used to determine the fluid flow direction with respect to the palaeotemperature gradient. Under equilibrium conditions, down-temperature fluid flow is predicted to produce sharp reaction fronts that separate rocks with isobarically divariant mineral assemblages. In contrast, up-temperature fluid flow may produce extensive zones of isobarically univariant mineral assemblages without sharp reaction fronts. However, during contact metamorphism, mineral reaction rates are probably relatively slow compared with fluid velocities and distended reaction fronts may also form during down-temperature fluid flow. In addition, uncertainties in the timing of fluid flow with respect to the thermal peak of metamorphism and the increase in the variance of mineral assemblages due to solid solutions introduce uncertainties in determining fluid flow directions. Equilibrium down-temperature flow of magmatic fluids in contact aureoles is also predicted to produce sharp δ18O fronts, whereas up-temperature flow of fluids derived by metamorphic devolatilization may produce gradational δ18O vs. distance profiles. However, if fluids are channelled, significant kinematic dispersion occurs, or isotopic equilibrium is not maintained, the patterns of isotopic resetting may be difficult to interpret. The one-dimensional models provide a framework in which to study fluid-rock interaction; however, when some of the complexities inherent in fluid flow systems are taken into account, they may not uniquely distinguish between up- and down-temperature fluid flow. It is probably not possible to determine the fluid flow direction using any single criterion and a range of data is required.
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  • 68
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd.
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Two samples from the Eclogite Micaschist Complex (EMC) and the Seconda Zona Diorito–Kinzigitica (IIDK) of the Sesia Zone have been studied using a high-spatial resolution laser probe 40Ar/39Ar technique with the aim of investigating the complexities of argon behaviour in metamorphic rocks and comparing their thermal histories. Data from a single large phengite grain from the EMC show a range of ages from mid-Jurassic to Upper Cretaceous. These ‘apparent age’ variations are spatially related to both locationwithin the grain and to intragrain microstructure. Modelling of the data shows that the profile formedby the diffusion of an excess argon component into the grain, parallel to the mica cleavage. Profileasymmetry is explained by temporal variations in microstructural development enabling excess argon toenter the grain at different times in different places. The temperatures of the initiation of deformationand the possible time-scales for the deformation can be calculated as a function of cooling rate. Allestimates suggest deformation at greenschist facies, in accord with the observed retrograde mineral assemblage. Absolute temperature estimates for deformation vary by less than 22 °C for different cooling ratesof 10 and 30 °C Ma−1 but vary by 80 °C with different estimates of diffusion parameters. The durationof deformation was for at least 2 Ma at 10 °C Ma−1 or 0.7 Ma at 30 °C Ma−1. Biotites from the IIDKsample record a Permian to Upper Cretaceous age range that correlates with grain size, the smallestgrain sizes yielding the youngest ages. This relationship is best explained by a partial resetting of biotitesduring an Alpine thermal event initiated not more than 70 Ma ago. Modelling of these data suggest thatthe sample never exceeded 300 °C during the Alpine. The profoundly different thermal histories of thetwo units—the EMC recrystallized at 550 °C whilst the IIDK remained below 300 °C—suggests thatthey may not have been juxtaposed until much later than the eclogite facies metamorphism.
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  • 69
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd.
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: In the southern Grenville Province of the Canadian Shield (Otter Lake area), high-grade marble, gneiss and amphibolite have been folded about north- to north-east-trending axes; mylonite zones, parallel to layering and 0.1–10 cm wide, are locally present in marble.In nonmylonitic marble, graphite occurs as c. 1–mm hexagonal prisms, which are commonly accompanied by a relatively few crystals that have been deformed, resulting in cleavage separation and the formation of folds and kink bands. Fracture-filled calcite contains less Mg and Fe than surrounding calcite (e.g. 〈0.30 compared with 1.8–2.7 wt% MgO, and 0.02–0.12 compared with 0.13–0.18 wt% FeO); the composition of fracture-filled dolomite is similar to that of the surrounding dolomite. In semimylonite, graphite forms elongate streaks of fragmented crystals and, in mylonite, further fragmentation has occurred to produce extremely small particles. The fragmentation has not destroyed the atomic structure (hexagonal modification) of graphite.The behaviour of biotite was similar to that of graphite, but extreme fragmentation did not occur. Dolomite was more rigid than calcite, and in mylonite it occurs more commonly as relics. Amphibole and pyroxene crystals remained undeformed but are locally replaced by calcite.The numerous microprocesses that have evidently occurred in marble and mylonitic marble of the study area are: coarsening (calcite, graphite), twinning (calcite, dolomite), slip (calcite, dolomite, graphite, biotite), strain-induced recrystallization (calcite), microfolding and kink-band formation (graphite, biotite), fragmentation (graphite) and the pressure-induced transport of calcite and dolomite to voids in graphite and biotite.
    Materialart: Digitale Medien
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  • 70
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd.
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: In the Laouni region (Central Hoggar, Algeria), retrogression of high-grade orthopyroxene–cordierite-bearing rocks led to the crystallization of orthoamphibole and garnet, and at a later stage of chlorite, from the original paragenesis. Calculated phase diagrams show that this retrogression occurred at about 3 kbar with the simplest model involving hydration at 650–700° C and at around 500° C, with the rocks experiencing aH2O less than 1, except possibly in the last stages of chlorite crystallization. As the other rock types occurring in the same area as the orthopyroxene–cordierite rocks display similar features, it is concluded that regional hydration occurred, presumably related to the release of fluids during the crystallization of the Pan-African granitic and mafic magmas that are widespread in the Laouni area.
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  • 71
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 72
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: The high-grade rocks (metapelite, quartzite, metagabbro) of the Hisøy-Torungen area represent the south-westernmost exposures of granulites in the Proterozoic Bamble sector, south Norway. The area is isoclinally folded and a metamorphic P–T–t path through four successive stages (M1-M4) is recognized.Petrological evidence for a prograde metamorphic event (M1) is obtained from relict staurolite + chlorite + albite, staurolite + hercynite + ilmenite, cordierite + sillimanite, fine-grained felsic material + quartz and hercynite + biotite ± sillimanite within metapelitic garnet. The phase relations are consistent with a pressure of 3.6 ± 0.5 kbar and temperatures up to 750–850°C. M1 is connected to the thermal effect of the gabbroic intrusions prior to the main (M2) Sveconorwegian granulite facies metamorphism. The main M2 granulite facies mineral assemblages (quartz+ plagioclase + K-feldspar + garnet + biotite ± sillimanite) are best preserved in the several-metre-wide Al-rich metapelites, which represent conditions of 5.9–9.1 kbar and 790–884°C. These P–T conditions are consistent with a temperature increase of 80–100°C relative to the adjacent amphibolite facies terranes. No accompanying pressure variations are recorded. Up to 1-mm-wide fine-grained felsic veinlets appear in several units and represent remnants of a former melt formed by the reaction: Bt + Sil + Qtz→Grt + lq. This dehydration reaction, together with the absence of large-scale migmatites in the area, suggests a very reduced water activity in the rocks and XH2O = 0.25 in the C–O–H fluid system was calculated for a metapelitic unit. A low but variable water activity can best explain the presence or absence of fine-grained felsic material representing a former melt in the different granulitic metapelites. The strongly peraluminous composition of the felsic veinlets is due to the reaction: Grt +former melt ± Sil→Crd + Bt ± Qtz + H2O, which has given poorly crystalline cordierite aggregates intergrown with well-crystalline biotite. The cordierite- and biotite-producing reaction constrains a steep first-stage retrograde (relative to M2) uplift path. Decimetre- to metre-wide, strongly banded metapelites (quartz + plagioclase + biotite + garnet ± sillimanite) inter-layered with quartzites are retrograded to (M3) amphibolite facies assemblages. A P–T estimate of 1.7–5.6 kbar, 516–581°C is obtained from geothermobarometry based on rim-rim analyses of garnet–biotite–plagioclase–sillimanite–quartz assemblages, and can be related to the isoclinal folding of the rocks. M4 greenschist facies conditions are most extensively developed in millimetre-wide chlorite-rich, calcite-bearing veins cutting the foliation.
    Materialart: Digitale Medien
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  • 73
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Key insights into the timing of tectonometamorphic events in a complex high-grade metamorphic terrane can be obtained by combining results from SHRIMP II ion microprobe studies of individual monazite grains with SHRIMP II studies and scanning electron microscope (SEM)-based cathodoluminescence (CL) imaging of zircons. Results from the Reynolds Range region, Arunta Block, Northern Territory, Australia, show that the final episode of regional metamorphism to high-T and low-P granulite facies conditions is most likely to have occurred at c. 1580 Ma, not at 1785–1775 Ma, as previously accepted. The previous interpretation was based on zircon studies of structurally controlled granitoids, without SEM-based CL imaging. Monazites in a 1806± 6 Ma megacrystic granitoid preserve rare cores that are interpreted to be inherited magmatic monazite, but record no evidence of another high-T event prior to 1580 Ma. Most monazites from the region record only a single high-T metamorphic event at c. 1580 Ma. Zircon inheritance is very common. Zircons or narrow overgrowths of zircon dated at c. 1580 Ma have only been found in two types of rocks: rocks produced by metasomatic fluid flow at high temperatures (≤750°C), and rocks that have undergone local partial melting. Previous explanations that attributed these 1580 Ma zircon ages to widespread hydrothermal fluid fluxing associated with post-tectonic pegmatite emplacement at amphibolite facies conditions are not supported by the available evidence including oxygen isotope data.The observed high regional metamorphic temperatures require the involvement of advective heating. However, contrary to a previous tectonic model for the formation of this and other low-P, high-T metamorphic belts, the granites that are exposed at the present structural level do not appear to be the source of that heat, unless some of the granites were emplaced at c. 1580 Ma.
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  • 74
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Samples of the calcite-rich Shelburne Marble collected at the Pfizer Quarry in Adams, Massachusetts, show an order of magnitude variation in grain size. Calcite grain size ranges from 94 to 1101 μm. Because these calcite marbles share the same pressure, temperature and strain histories, some other factor must be responsible for the grain size variation.Grain size appears to be controlled by the concentration of impurity or second-phase particles. Large calcite grain size occurs where the volume fraction of second-phase particles is low and grain size decreases as second-phase volume fraction increases. The relationship between calcite grain size (D), second-phase grain size (d ) and second-phase volume fraction ( f ) can be described by the power law D/d=1.4/f  0.36, a result that is consistent with models based upon short-term (hours or days) laboratory experiments with metals and ceramics and computer simulations of grain growth. Grain growth appears to be greatly restricted by as little as a few per cent of second-phase particles, with a transition from highly restricted to almost unrestricted grain growth occurring at ≈5% volume of second-phase particles. These results indicate that second-phase particles exercise an important control on grain size and can effectively inhibit grain growth in metamorphic rocks. The behaviour of second-phases in short-term laboratory experiments may closely approximate the behaviour of second-phases in grain growth lasting several orders of magnitude longer in the metamorphic environment.
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  • 75
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Phase analysis in the model K2O-poor aluminous rock system (FMASH) illustrates the following sequence of reactions during retrograde metamorphism in the Botswanan Limpopo Central Zone:Opx+Sil+Qtz=Crd ,Opx+Sil=Spr+Crd ,Grt+Qtz=Opx+Crd ;Opx+Crd+W=Ged+Qtz ,Grt+Opx+Crd+W=Ged ;andGrt+Qtz+W=Ged+Crd .A quantitative petrogenetic grid with phase relations shows that sapphirine results from nearly isothermal decompression in the quartz-undersaturated portions of the grid, and that gedrite formation by reactions (4)–(6) records isobaric cooling from high temperature (c. 800° C) after the decompression. Conditions for hydration in the western part of the area were 700–800° C and c. 6 kbar, based on microthermometric data and the available garnet–cordierite geothermometer. On the basis of these conditions and predicted thermodynamic properties of gedrite, phase relations in T–XMg space were constructed to investigate the isobaric cooling event. The results are in good agreement with the hydration P–T  path. Further, the T–XMg topologies show that hydration of orthopyroxene in the central part of the area (reaction 4) occurred at about 800° C and c. 5 kbar. Therefore, we conclude that the Botswanan Limpopo Central Zone has suffered isothermal decompression, similar to the Central Zone in South Africa and Zimbabwe, followed by isobaric cooling. The isobaric cooling event in the western (at c. 6 kbar) and central (at c. 5 kbar) parts of the area commenced at nearly the same temperature (c. 800° C), and appear to be consistent with a tectonic model that involved westward movement (thrusting) of the Central Zone.
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  • 76
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: We investigated the metamorphic cooling history of underplated magmatic rocks at midcrustal depth. Granulites and amphibolites occur within the Jurassic magmatic belt of the Coast Range south of Antofagasta in northern Chile between 23°25′ and 24°20′ S. The protoliths of the metamorphic rocks are basic intrusions of Early Mesozoic age. They are part of the magmatically formed crust, and the essentially dry magmas were emplaced in an extensional regime. The granulites (clinopyroxene–orthopyroxene–plagioclase) show all stages of fabric development from magmatic to granoblastic fabrics. Pyroxene compositions were reset at temperatures around 800° C independent of the stage of textural equilibration. The granulites were partially amphibolitized at upper amphibolite facies temperatures of 600–700° C. Following cooling, a possible reheating to greenschist facies temperatures around 500° C is indicated by prograde zoning in magnetite–ilmenite pairs. Mineral assemblages are not suitable for barometry, but a conservative estimation of the garnet-in reaction at given whole-rock compositions suggests maximum pressures in the granulite facies of around 5 kbar, and similar pressures are indicated by phengite barometry for the greenschist facies. The P–T  path of granulite–amphibolite metamorphism is one of slow cooling from magmatic temperatures with heterogeneous deformation. The thinning of the pre-Andean (Precambrian–Triassic) crust was apparently compensated by the magmatic underplating and this special tectonomagmatic setting caused the prolonged residence of the accreted rocks at midcrustal levels.
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  • 77
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 78
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Granulite facies quartzites from the Ihouhaouene region, in the northern part of In Ouzzal, contain the assemblage corundum+quartz+magnetite together with hercynitic spinel+quartz+magnetite, sillimanite+quartz+magnetite and almandine-rich garnet+quartz+magnetite. Two types of corundum have been recognized: the first is primary and is found with quartz and magnetite only; the second type is found together with magnetite and chlorite rimming spinel as a fine-grained corona. The textures show that spinel-rich magnetite probably exsolved primary corundum, sillimanite, spinel and garnet during the cooling history. The secondary corundum formed later from the spinel already exsolved from magnetite. The secondary corundum is certainly metastable with respect to quartz. This may also apply for the primary corundum. However, given the high-temperature setting of this rock, it cannot be excluded that the stable contacts observed between primary corundum and quartz indicate equilibrium between the two phases. Taking into account the uncertainties in the thermodynamic data, the stability of this assemblage would imply that this part of In Ouzzal has recorded very high P–T conditions, above 1100°C at 12 kbar.
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  • 79
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: The In Ouzzal granulitic unit (IOGU) consists predominantly of felsic orthogneisses most of which correspond to granitoids emplaced during the Archaean, plus metasediments, including olivine-spinel marbles, of late Archaean age. All units were metamorphosed at granulite facies during the Eburnean (2 Ga). The stable isotope signature of the marbles (δ13C=–0.8 to –4.2‰/PDB; δ18O = 7.9 to 18.9‰/SMOW) does not record a massive streaming of C-bearing fluids during metamorphism. Most of the isotopic variation in the marbles is explained in terms of pregranulitic features. Metasomatic transformation of granulites into layered potassic syenitic rocks and emplacement of carbonate veins and breccias occurred during retrogressive granulite facies conditions. The chemistry of these rocks is comparable with that of fenites and carbonatites with high contents of (L)REEs, Th, U, F, C, Ba and Sr but, with respect to these elements, a relative depletion in Nb, Ta, Hf, Zr and Ti. The isotopic compositions of Nd (ɛNd(T)=–6.3 to –9.9), of Sr (87Sr/86Sr(T)= 0.7093–0.7104), and the O isotopic composition of metasomatic clinopyroxene (δ18O = 6.9 to 8‰), all indicate that the fluid had a strong crustal imprint. On the basis of the C isotope ratios (δ13C =–3.5 to –9.7‰), the fluid responsible for the crystallization of carbonates and metasomatic alteration is thought to be derived from the mantle, presumably through degassing of mantle-derived magmas at depth. Intense interaction with the crust during the upward flow of the fluid may explain its chemical and isotopic signatures. The zones of metasomatic alteration in the In Ouzzal granulites may be the deep-seated equivalents of the zones of channelled circulation of carbonated fluids described at shallower levels in the crust.
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  • 80
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: The In Ouzzal granulitic massif is composed mainly of various meta-igneous rocks which, in spite of Rb, U, Th, Cs and some K and Sr mobility, can be dated and generally classified according to their chemical composition as follows.Basic and ultrabasic granulites interlayered with the metasediments correspond to (1) ultrabasic cumulates from dislocated tholeiitic bodies, (2) ancient komatiitic to high-Mg tholeiitic basalts similar to the suites found in Archaean greenstone belts and (3) calcalkaline protoliths of high-K andesitic composition. No geochronological constraints are available apart from the depositional age of some associated sediments which is younger than 2.70 Ga detrital zircons, and the Nd model age of the andesitic granulites of c. 3.4 Ga.In spite of the high-grade metamorphism, the acidic magmatic precursors of the charnockites can be divided in three groups. (1) The most juvenile acid orthogneisses are trondhjemitic or tonalitic in composition, being similar to the TTG suites which are classically considered to be formed by partial melting of mantle-derived protoliths. The 3.3–3.2 Ga TDM indicates a possible age of separation from the mantle reservoir while the plutons may have been emplaced between 3.3 and 2.7 Ga (U–Pb zircon & Nd ages). (2) A group of alkaline granitic gneisses, similar in composition to rift-related-granites, were emplaced at 2650±10 Ma (U–Pb & Rb–Sr ages) in a thick continental crust. (3) Calcalkaline granodioritic and monzogranitic suites derived from the partial melting of continental precursors (3.5–3.3 Ga), in lower to middle levels of the continental crust. They were emplaced close to 2.5 Ga during crustal thickening.The very high-temperature metamorphism occurred at 2002±7 Ma from the age of synfoliation intrusions and was probably related to major overthrusting. Retrogressive metamorphism is dated at 1.95 Ga from garnet-Nd ages. In spite of the very high-temperature conditions, partial melting during granulite facies metamorphism may be restricted to scarce cordierite-bearing monzogranitic gneisses. The 2.0 Ga VHT metamorphism could be related to overthrusting, extensional or underplating processes.
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  • 81
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: High-pressure metamorphic rocks exposed in the Bantimala area, c. 40 km north-east of Ujung Pandang, were formed as a Cretaceous subduction complex with fault-bounded slices of melange, chert, basalt, turbidite, shallow-marine sedimentary rocks and ultrabasic rocks. Eclogites, garnet–glaucophane rocks and schists of the Bantimala complex have estimated peak temperatures of T =580–630 °C at 18 kbar and T =590–640 °C at 24 kbar, using the garnet–clinopyroxene geothermometer. The garnet–omphacite–phengite equilibrium is used to estimate pressures. The distribution coefficient KD1=[(Xpyr)3(Xgrs)6/(Xdi)6]/[(Al/Mg)M2,wm (Al/Si)T2,wm]3 among omphacite, garnet and phengite is a good index for metamorphic pressures. The KD1values of the Bantimala eclogites were compared with those of eclogites with reliable P–T  estimates. This comparison suggests that peak pressures of the Bantimala eclogites were P=18–24 kbar at T =580–640 °C. These results are consistent with the P–T  range calculated using garnet–rutile–epidote–quartz and lawsonite–omphacite–glaucophane–epidote equilibria.
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  • 82
    Digitale Medien
    Digitale Medien
    Oxford : Blackwell Science Ltd.
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: The S.W. Nabitah Mobile Belt, Saudi Arabia, contains a Proterozoic island-arc complex. In the Qadda area, the metavolcanic-dominated supracrustal sequence records amphibolite facies regional metamorphism of high-T , low-P type. Calcsilicate rocks and aluminous dolomitic marbles within the supracrustal sequence have been studied in detail to refine estimates of peak metamorphic P–T  conditions and assess the role of fluids during prograde and retrograde metamorphism.Fluid-independent thermobarometers (including the calcite–dolomite thermometer and P-sensitive equilibria involving grossular, wollastonite, anorthite, meionite, quartz and calcite) yield peak P–T  conditions of c. 650–660 °C, 4 kbar, both higher than previous estimates, giving a revised average thermal gradient of c. 45 °C km–1.The close match between the peak temperatures implied by calcite–dolomite thermometry and those recorded by univariant devolatilization equilibria suggests that the calcareous rocks were fluid-bearing during late-prograde and peak metamorphic stages. These fluids were essentially binary H2O–CO2 mixtures with low NaCl and HF concentrations. Most were H2O-rich, with XCO2 between 0.02 and 0.2, but values of c. 0.6 are recorded by two samples. High modal abundances of the solid products of decarbonation reactions (e.g. c. 10–50% wollastonite) in many of the rocks that record low-XCO2 equilibrium fluids implies infiltration of significant quantities of externally derived aqueous fluid during late-prograde metamorphism, but not enough to exhaust the buffering capacity of the rocks. Calculated minimum time-integrated fluid-to-rock ratios of five wollastonite-bearing calcsilicate rocks range from 0.7±0.22 to 1.39±0.46 (1σ); those of six marbles range from c. 0 to 4±1.4. The latter variation occurs on a metre-scale, implying focusing of fluid flow. Diopside-rich rocks record fluid-to-rock ratios of up to 88±48. Penetrative wollastonite lineations indicate a temporal link between infiltration and distributed ductile deformation. Infiltrating fluids were probably derived both from the prograde dehydration of adjacent metabasalts and metatuffs and from crystallization of voluminous pretectonic granitoid intrusions. In general, fluid-to-rock ratios deduced for the metavolcanic-dominated Qadda area are similar to those recorded by rocks in the metasediment-dominated terrane of N. New England.The occurrence of post-tectonic retrograde hydration textures in both carbonate-bearing and carbonate-free rocks otherwise lacking hydrous minerals testifies to infiltration of aqueous fluids during retrograde metamorphism in the absence of penetrative deformation. Minimum fluid-to-rock ratios calculated for secondary grossular reaction rims in some calcsilicates are c. 0.04. Later patchy hydration of scapolite probably utilized static, pore-filling fluids remaining after the early retrograde infiltration.
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  • 83
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: The products of metamorphic fluid flow are preserved in zones within the marbles and metamorphosed semipelites of the Upper Calcsilicate Unit in the granulite portion of the Late Palaeoproterozoic Reynolds Range Group, northern Arunta Block, central Australia. The zones of retrogression, characterized by minerals such as wollastonite, grossular and clinohumite, local resetting of oxygen isotopic compositions and local major element metasomatism, were channelways for water-rich fluids derived from granulite facies metapelites. U–Th–Pb isotopic ages measured by the SHRIMP ion microprobe on zircon and monazite from a granulite facies semipelite, an early semiconcordant aluminous quartz-rich fluid-flow segregation and a late discordant quartz-rich segregation record some of the extended thermal history of the area. Zircon cores from the semipelite show its likely protolith to be an igneous rock 1812 ± 11 Ma old, itself derived from a source containing zircon as old as 2.2 Ga. Low-Th/U overgrowths on the zircon grew during granulite facies metamorphism at 1594 ± 6 Ma. Monazite cooled to its blocking temperature at 1576 ± 8 Ma. Zircon cores from the semiconcordant segregation are dominantly 〉2.3 Ga old, indicating that the source of the fluids was not the particular metamorphosed semipelite studied. Two generations of low-Th/U overgrowths on the zircon give indistinguishable ages for the older and younger of 1589 ± 8 and 1582 ± 8 Ma, respectively. The monazite age is the same, 1576 ± 12 Ma. Zircon from the late discordant segregation gave 1568 ± 4 Ma. Fluid flow occurred for at least 18 ± 3 (σ) Ma and ended 26 ± 3 (σ) Ma after the peak of metamorphism, suggesting a very slow cooling rate of ∼3°C Ma–1. The last regional high-grade metamorphism in the Reynolds Range occurred at ∼1.6 Ga, not ∼1.78 Ga as previously thought. The high-grade event at ∼1.78 Ga is a separate event that affected only the basement to the Reynolds Range Group.
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  • 84
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Materialart: Digitale Medien
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  • 85
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 14 (1996), S. 0 
    ISSN: 1525-1314
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Materialart: Digitale Medien
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  • 86
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 12 (1996), S. 0 
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. Four field experiments were carried out on cultivated shallow fen peat overlying acid gyttja (lake mud) soil. The accessibility of the generally ample supply of physically available water was restricted by a limited root depth caused by low pH and high levels of aluminium in the subsoil. In order to improve the nutrient status and the crop water supply of the soils liming, deep cultivation, P-fertilization and irrigation were tested in field experiments comprising these four main treatments and their combinations. Liming and P-fertilization of the topsoil, irrigation and deep cultivation in combination with deep liming improved crop yields. Deep cultivation without liming had a negative effect on yield in most years.
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  • 87
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 12 (1996), S. 0 
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. The effect of liming and deep cultivation on soil properties and root development was investigated in two cultivated shallow fen peats resting on acid gyttja (lake mud) soils. Root growth was in general dependent on soil pH and aluminium content of the soil. A soil pH (H2O) below 5 adversely affected roots and a pH below 4 severely restricted root growth. Liming of the topsoil or the subsoil and to some extent deep cultivation improved root growth. Increased rooting depth made it possible for plants to utilize soil water to a greater depth in the profile and to support a larger crop yield.
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  • 88
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 12 (1996), S. 0 
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. Flow and nitrate concentrations were measured weekly for four years at twelve stream-water monitoring sites in a catchment in the English Midlands designated as a Nitrate Advisory Area. Farm surveys and satellite images have provided soil and land use information. Measurements show the nitrate load to be dominated by discharge, with large variability due to differing weather conditions from year to year. Within-year variability in nitrate concentrations is also related to weather conditions, with high concentrations when field capacity is reached if this occurs late in the year. There is also clear evidence of dilution of nitrate during intense storms. The effect of changing weather conditions makes it impossible to identify catchment-scale changes in leaching due to changes in agricultural practice over a period as short as four years. Measurements from a major spring in the catchment show an increasing trend in nitrate concentrations through the period. There is some evidence that the greatest N leaching to streams in the catchment is associated with intensive grassland on soils which are naturally poorly drained.
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  • 89
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 12 (1996), S. 0 
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. At De Marke experimental farm, data on water and nitrogen flows in the unsaturated zone were gathered on two grazed pastures on sandy soils during the years 1991 to 1994. These provided a basis for calibration and validation of simulation models. The different levels of nitrate-N concentrations of the two plots could largely be explained by differences in crop uptake and simulated denitrification as influenced by different groundwater levels. The irregular distribution of excreta was taken into account by a simulation study quantifying the variability of nitrate-N concentrations under a grazed field. The resulting distribution of simulated nitrate-N concentrations explained the average and peak values of the measured concentrations. Temporal variability of weather was used to assess the nitrate leaching risk under urine patches deposited in either July or September. At site A the probability of exceeding the EC-directive by drinking water (11.3 mg/1 nitrate-N) under a urination deposited in either July or September was respectively 10 and 25%. The average field concentration at this site will hardly ever be a high risk for the environment under the current farm management. At site B the EC-directive will be exceeded under any urine patch in almost 100% of the years, affecting the field average concentration. In field B careful grazing management would result in less nitrate leaching, but the environmental goals would not be reached.
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  • 90
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 12 (1996), S. 0 
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. A field experiment on a coarse sand (1987–92) was conducted with spring barley (Hordeum vulgare L.), in order to evaluate the effects of increasing N fertilization on nitrate leaching under temperate coastal climate conditions. The N fertilizer levels were 60 and 120 kg N/ha. The experiment was conducted on a 19-year old permanent field trial with continuous spring barley, initiated in 1968, and included treatments with ploughing in autumn or spring, with or without perennial ryegrass (Lolium perenne L.) as a catch crop undersown in spring. Prior to 1987, the low and high levels of N fertilizer were 70 and 150 kg N/ha, respectively. To calculate nitrate leaching, soil water samples were taken from a depth of 0.8 m using ceramic cups. The average annual nitrate leaching from plots with 60 and 120 kg N/ha was 38 and 52 kg N/ha/y, respectively. The increased leaching associated with increasing fertilizer application was not caused by inorganic N in the soil at harvest, but rather by greater mineralization, mainly in autumn. Growing of a catch crop was relatively more efficient for reducing nitrate leaching than a long-term low fertilizer application. A 50% reduction in N application decreased average yield by 26%, while nitrate leaching decreased by 27%.
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  • 91
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 12 (1996), S. 0 
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. Whey, the liquid byproduct of cheese production, can improve the physical condition of sodic soils or those susceptible to erosion by increasing their aggregate stability. The effects of whey on soil hydraulic properties, however, are not known. In this experiment, we used tension infiltrometers to determine whey effects on infiltration rates of water (at suctions ≥ 30 mm of water) and unsaturated hydraulic conductivities of Ap horizons of a Portneuf silt loam (coarse-silty, mixed, mesic Durixerollic Calciorthid) after a winter wheat crop. In the summer of 1993 near Kimberly, ID, USA, liquid whey was flood-applied at either 0, 200,400, or 800 t/ha to plots planted to wheat the previous September. At suctions of 60 and 150 mm, infiltration rates decreased linearly by about 0.7 μm/s with each additional 100 t/ha of whey applied. As whey applications increased, hydraulic conductivities at 60 mm suction increased slightly but as applications exceeded 400 t/ha decreased significantly. We concluded that summer whey applications up to 400 t/ha would not adversely affect surface hydraulic properties.
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  • 92
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 12 (1996), S. 0 
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. The potential for using coal-derived humic substances to improve the available water holding capacity (AWC) and aggregate stability of typical Mediterranean soils was evaluated in the laboratory using an agricultural surface (0–20 cm) soil from each of three regions of Italy, (Sicily, Tuscany and Venetia) and five rates of humic acids (HA), 0,0.05,0.10,0.50 and 1.00 g/kg. There were significant (P 〈 0.05) differences between the field capacity (FC), permanent wilting point (PWP), and available water capacity (AWC) values of the controls and those treated with 0.05 g/kg of the HA. Beyond this rate, differences in these properties were not significant. At the 1.00 g/kg HA rate, the relative improvements in AWC over the three controls were 30%, 10% and 26%. Low rates (0.05 to 0.10 g/kg) of HA were also needed to obtain a 40 to 120% improvement in aggregate stability of these soils relative to the controls. These results indicate that the addition of highly humified organic matter such as coal-derived humic substances can improve the structural and water retention properties of degraded arable soils. However, since there is not yet any direct evidence that these humic materials can ameliorate soils under field conditions, field studies will be needed to validate these results.
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  • 93
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 12 (1996), S. 0 
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. A study of soil water erosion was undertaken between 1982 and 1986 in 17 areas of lowland England and Wales. Air photographs were taken annually, these were checked to identify erosion events and a sample of 392 eroded fields visited between 1983 and 1986. Erosion was most common in fields drilled with winter cereals (39% of cases), which was the crop considered by farmers to be at greatest risk of erosion. Estimated crop losses were greater than 10% for only 5% of fields. ‘Clean up’ costs were incurred on 15% of the fields studied. Attempts at contour ploughing and planting/drilling appeared to result in more severe erosion, than working up and down the slope. Farmers considered that the main reason for erosion on their farms was arable cropping, and the presence of compacted wheelings/tramlines. Fields where hedges had been removed in the last 20 years suffered from erosion marginally more frequently than other fields. Field slope alone was not found to be a major factor in the occurrence of erosion, with almost 60% of erosion events on slopes of less than 7°. Erosion occurred at least every other year in half the fields studied.
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  • 94
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 12 (1996), S. 0 
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Book reviews in this article: Soil Resilience and Sustainable Land Use Edited by D. J. Greenland and I. Szabolcs.
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  • 95
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Materialart: Digitale Medien
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  • 96
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 12 (1996), S. 0 
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. Using the simulation model MACRO, this paper investigates the likely consequences of reduced irrigation inputs on the water and salt balance and crop growth in a drained, saline clay in a Mediterranean climate (Marismas, SW Spain). The model was first successfully validated against field measurements of the soil water and chloride balance, water table depths and drain outflows in the 1989 growing season. Three-year simulations were then performed assuming two different irrigation applications (60 and 75% reductions from the 1989 amount) and two different frequencies (12 or 6 irrigations per growing season). The model predictions suggested that reduced irrigation may lead to up to a 15%) increase in the chloride content of the soil profile after 3 years. Also, despite overall reductions in water discharge, slight increases in chloride leaching via field drains (c. 4 to 8%) were predicted. The model demonstrated that encroachment of salt into the soil profile may he exacerbated by the non-equilibrium nature of water flow and solute transport (‘by-passing flow’) in structured clays. With reduced water supply for irrigation, more frequent applications may give marginally better crop yields for the same quantity of irrigation but at the expense of slightly increasing salt concentration in the root zone.
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  • 97
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 12 (1996), S. 0 
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. A model was developed to estimate daily evapotranspiration and root zone soil moisture changes appropriate for scheduling irrigation, incorporating a modified version of the Penman-Monteith equation.The model was field tested during 1992–94, for potatoes and sugarbeet, by comparing modelled root zone soil moisture changes with field measurements taken using neutron probes. The study confirmed the accuracy of the model when predicting crop water use and soil moisture change. Linear regression of measured versus modelled data exhibited a slope of 0.99 and an intercept close to and not significantly different from zero. The relationship accounted for 80% of the variation.
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  • 98
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 12 (1996), S. 0 
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. Regular application of slurry manure in large quantities is thought to degrade soil structure and increase erodibility. One hypothesis links this to the large input of potassium which increases the exchangeable potassium percentage (EPP) and, thereby, dispersion. The effect of EPP on erodibility was quantified in three experiments. In the laboratory, eleven rainfall experiments were conducted using a silty topsoil from a typic Hapludalf which was fertilized to EPPs of 4 to 18%. Field rainfall experiments on 22 Inceptisols and Alfisols were used to examine whether the long-term application of monovalent cations (Na+, K+ and NH4+) with slurry manure had changed soil properties, especially erodibility. In addition, erodibilities of 32 soils determined with natural and simulated rains were taken from literature. The experiments on these 65 soils together covered a wide range of soils, slopes and rainfalls. Dispersion by a large percentage of highly hydrated ions (K+, Na+) reduced the infiltration rate faster, caused runoff up to 5 min earlier, and increased sediment concentrations by 15g/l compared to low EPP soils. These changes increased soil erodibility of the Universal Soil Loss Equation (USLE) by 0.021 t × h/N × ha (where N = Newtons) for each 1% increase in EPP + ESP (exchangeable sodium percentage). The ESP contributed little to this increase as ESP was less than 1/10 of EPP in the experiments.Fields with long-term manure application had similar chemical, physical and microbiological soil properties as fields without slurry manure except for slightly greater pH (+ 0.6) and P (+ 17 mg/kg) values. We conclude that, as long as the potassium input and output are balanced, the long-term use of slurry manure does not increase erodibility.
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  • 99
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 12 (1996), S. 0 
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. A model was developed to predict evapotranspiration and soil moisture changes, which could be used either for scheduling irrigation or crop water-use studies. The general form of the model is reported here, and its validation for sugarbeet and potatoes is described in a subsequent paper. The soil characteristics required are depth of topsoil, texture or available water capacity of topsoil and subsoil, and whether a significant slope exists. The plant characteristics required are species and planting date. Meteorological data used to calculate potential evapotranspiration are obtained from the Meteorological Office synoptic network, but local rainfall data are preferred.The model estimates potential evapotranspiration of a reference crop, and uses this to model canopy and root development for all crops at each location. Available options allow for observed data on canopy or root development to be incorporated into the simulations. Estimates of potential evapotranspiration for each crop are then adjusted to allow for the effects of water stress, taking soil characteristics, root depth and evapotranspiration demand into account.The model enables growers to reduce the risks of under- or over-watering their crops and has proved successful in irrigation management.
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  • 100
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 12 (1996), S. 0 
    ISSN: 1475-2743
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract. A land evaluation using unsophisticated data successfully predicted yield ranges of various crops in Burundi. Yields of wheat, pea, bean, maize and potato predicted from data for climate, soil and land use technology were compared with observed yields from farm trials and from seed station and research station trials. The predicted range of yield for each crop suitability class enclosed the mean farm yields 13 times out of 16 and yields on seed stations and research stations 10 times out of 15 and 14 times out of 21 respectively. The variability of the observed yields exceeded the predicted range of yields. The method is considered as validated. The method appears to be applicable for multi-year studies at a broad scale, but yield variation according to the weather from year to year is not accounted for. The variances of the yields on farms are greater than the variances in seed station and research station trials.Since the method predicts correctly the mean regional farm yields, it could be useful for land use planning, research into optimal regional cropping specialisation, studies on food policy, and for evaluation of economic return and sustainability of different crops.
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