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Understanding Granites : Integrating New and Classical Techniques ; [inspired by an international workshop entitled "Modern and classical Techniques in granite studies" that was held in the University of Huelva (Spain) in November 1997] (1999)

Geological Society (London, U.K.) ; Castro, Antonio ; Fernández, Carlos ; [weitere]

London : The Geological Society

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Schlagwort(e): Granit ; Gesteinskunde ; Geologie ; Geochemie ; Kongress ; Huelva ; Magmatisches Gestein ; Magmatismus ; Magma ; Magmakammer ; Schmelze ; Intrusion ; Erdkruste ; Erdmantel ; Viskosität ; Angewandte Geophysik ; Textur ; Modellierung

Beschreibung / Inhaltsverzeichnis: Understanding granites: integrating new and classical techniques / Antonio Castro, Carlos Fernández and Jean Louis Vigneresse / Geological Society, London, Special Publications, 168, 1-5, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.01 --- Some time-space relationships for crustal melting and granitic intrusion at various depths / Alan Bruce Thompson / Geological Society, London, Special Publications, 168, 7-25, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.02 --- Granitic melt viscosities / Donald B. Dingwell / Geological Society, London, Special Publications, 168, 27-38, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.03 --- Geophysical imaging of the shape of granitic intrusions at depth: a review / L. Améglio and J. L. Vigneresse / Geological Society, London, Special Publications, 168, 39-54, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.04 --- What do experiments tell us about the relative contributions of crust and mantle to the origin of granitic magmas? / Alberto E. Patiño Douce / Geological Society, London, Special Publications, 168, 55-75, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.05 --- Geometry of granite emplacement in the upper crust: contributions of analogue modelling / Teresa Román-Berdiel / Geological Society, London, Special Publications, 168, 77-94, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.06 --- A multidisciplinary approach combining geochemical, gravity and structural data: implications for pluton emplacement and zonation / L. Hecht and J. L. Vigneresse / Geological Society, London, Special Publications, 168, 95-110, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.07 --- The Coastal Batholith and other aspects of Andean magmatism in Peru / E. J. Cobbing / Geological Society, London, Special Publications, 168, 111-122, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.08 --- Contrasts in morphogenesis and tectonic setting during contemporaneous emplacement of S- and I-type granitoids in the Eastern Lachlan Fold Belt, southeastern Australia / R. Trzebski, P. Lennox and D. Palmer / Geological Society, London, Special Publications, 168, 123-140, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.09 --- Structure and geophysics of the Gåsborn granite, central Sweden: an example of fracture-fed asymmetric pluton emplacement / Alexander R. Cruden, Håkan Sjöström and Sven Aaro / Geological Society, London, Special Publications, 168, 141-160, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.10 --- Emplacement of the Joshua Flat-Beer Creek Pluton (White Inyo Mountains, California): a story of multiple material transfer processes / Carlo Dietl / Geological Society, London, Special Publications, 168, 161-176, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.11 --- Petrology, magnetic fabric and emplacement in a strike-slip regime of a zoned peraluminous granite: the Campanario-La Haba pluton, Spain / A. Alonso Olazabal, M. Carracedo and A. Aranguren / Geological Society, London, Special Publications, 168, 177-190, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.12 --- Brittle behaviour of granitic magma: the example of Puente del Congosto, Iberian Massif, Spain / Carlos Fernández and Antonio Castro / Geological Society, London, Special Publications, 168, 191-206, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.13 --- Origin of megacrysts in granitoids by textural coarsening: a crystal size distribution (CSD) study of microcline in the Cathedral Peak Granodiorite, Sierra Nevada, California / Michael D. Higgins / Geological Society, London, Special Publications, 168, 207-219, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.14 --- Movement of melt during synchronous regional deformation and granulite-facies anatexis, an example from the Wuluma Hills, central Australia / E. W. Sawyer, C. Dombrowski and W. J. Collins / Geological Society, London, Special Publications, 168, 221-237, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.15 --- Partial melting and P-T-t evolution of LP/HT metamorphic terranes: an example from the Svecofennian K-feldspar-poor leucosome migmatite belt, Southern Finland / H. Mouri and K. Korsman / Geological Society, London, Special Publications, 168, 239-253, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.16 --- Evidence of magmatic hybridization related with feeding zones: the synkinematic Guitiriz granitoid, NW Iberian Massif / M. Menéndez and L. A. Ortega / Geological Society, London, Special Publications, 168, 255-272, 1 January 1999, https://doi.org/10.1144/GSL.SP.1999.168.01.17

Seiten: Online-Ressource (272 Seiten) , Illustrationen, Diagramme, Karten

ISBN: 1862390584

URL: http://sp.lyellcollection.org/content/168/1

Sprache: Englisch

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In Sight of the Suture : the Palaeozoic geology of the Isle of Man in its Iapetus Ocean context (1999)

Geological Society (London, U.K.) ; Woodcock, Nigel H. ; Quirk, D. G. ; [weitere]

London : The Geological Society

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Schlagwort(e): Geologie ; Isle of Man ; Paläozoikum

Beschreibung / Inhaltsverzeichnis: N. H. Woodcock, D. G. Quirk, W. R. Fitches, and R. P. Barnes: In sight of the suture: the early Palaeozoic geological history of the Isle of Man / Geological Society, London, Special Publications, 160:1-10, doi:10.1144/GSL.SP.1999.160.01.01 --- T. D. Ford, Eva Wilson, and D. J. Burnett: Previous ideas and models of the stratigraphy, structure and mineral deposits of the Manx Group, Isle of Man / Geological Society, London, Special Publications, 160:11-21, doi:10.1144/GSL.SP.1999.160.01.02 --- Manx Group Stratigraphy and Lithofacies --- S. G. Molyneux: A reassessment of Manx Group acritarchs, Isle of Man / Geological Society, London, Special Publications, 160:23-32, doi:10.1144/GSL.SP.1999.160.01.03 --- P. J. Orr and M. P. A. Howe: Macrofauna and ichnofauna of the Manx Group (early Ordovician), Isle of Man / Geological Society, London, Special Publications, 160:33-44, doi:10.1144/GSL.SP.1999.160.01.04 --- N. H. Woodcock, J. H. Morris, D. G. Quirk, R. P. Barnes, D. J. Burnett, W. R. Fitches, P. S. Kennan, and G. M. Power: Revised lithostratigraphy of the Manx Group, Isle of Man / Geological Society, London, Special Publications, 160:45-68, doi:10.1144/GSL.SP.1999.160.01.05 --- D. G. Quirk and D. J. Burnett: Lithofacies of Lower Palaeozoic deep-marine sediments in the Isle of Man: a new map and stratigraphic model of the Manx Group / Geological Society, London, Special Publications, 160:69-88, doi:10.1144/GSL.SP.1999.160.01.06 --- Manx Group Sedimentation --- N. H. Woodcock and R. P. Barnes: An early Ordovician turbidite system on the Gondwana margin: the southeastern Manx Group, Isle of Man / Geological Society, London, Special Publications, 160:89-107, doi:10.1144/GSL.SP.1999.160.01.07 --- P. S. Kennan and J. H. Morris: Manganiferous ironstones in the early Ordovician Manx Group, Isle of Man: a protolith of coticule? / Geological Society, London, Special Publications, 160:109-119, doi:10.1144/GSL.SP.1999.160.01.08 --- N. H. Woodcock and J. H. Morris: Debris flows on the Ordovician margin of Avalonia: Lady Port Formation, Manx Group, Isle of Man / Geological Society, London, Special Publications, 160:121-138, doi:10.1144/GSL.SP.1999.160.01.09 --- R. P. Barnes, G. M. Power, and D. C. Cooper: The definition of sandstone-bearing formations in the Isle of Man and correlation with adjacent areas — evidence from sandstone chemistry / Geological Society, London, Special Publications, 160:139-154, doi:10.1144/GSL.SP.1999.160.01.10 --- Magmatism --- J. D. A. Piper, A. J. Biggin, and S. F. Crowley: Magnetic survey of the Poortown Dolerite, Isle of Man / Geological Society, London, Special Publications, 160:155-163, doi:10.1144/GSL.SP.1999.160.01.11 --- G. M. Power and S. F. Crowley: Petrological and geochemical evidence for the tectonic affinity of the (?)Ordovician Poortown Basic Intrusive Complex, Isle of Man / Geological Society, London, Special Publications, 160:165-175, doi:10.1144/GSL.SP.1999.160.01.12 --- Post-Ordovician Units --- M. P. A. Howe: The Silurian fauna (graptolite and nautiloid) of the Niarbyl Formation, Isle of Man / Geological Society, London, Special Publications, 160:177-187, doi:10.1144/GSL.SP.1999.160.01.13 --- J. H. Morris, N. H. Woodcock, and M. P. A. Howe: The Silurian succession of the Isle of Man: the late Wenlock Niarbyl Formation, Dalby Group / Geological Society, London, Special Publications, 160:189-211, doi:10.1144/GSL.SP.1999.160.01.14 --- J. D. A. Piper and S. F. Crowley: Palaeomagnetism of (Palaeozoic) Peel Sandstones and Langness Conglomerate Formation, Isle of Man: implications for the age and regional diagenesis of Manx red beds / Geological Society, London, Special Publications, 160:213-225, doi:10.1144/GSL.SP.1999.160.01.15 --- Tectonics and Metamorphism --- G. S. Kimbell and D. G. Quirk: Crustal magnetic structure of the Irish Sea region: evidence for a major basement boundary beneath the Isle of Man / Geological Society, London, Special Publications, 160:227-238, doi:10.1144/GSL.SP.1999.160.01.16 --- D. G. Quirk, D. J. Burnett, G. S. Kimbell, C. A. Murphy, and J. S. Varley: Shallow geophysical and geological evidence for a regional-scale fault duplex in the Lower Palaeozoic of the Isle of Man / Geological Society, London, Special Publications, 160:239-257, doi:10.1144/GSL.SP.1999.160.01.17 --- W.R. Fitches, R. P. Barnes, and J. H. Morris: Geological structure and tectonic evolution of the Lower Palaeozoic rocks of the Isle of Man / Geological Society, London, Special Publications, 160:259-287, doi:10.1144/GSL.SP.1999.160.01.18 --- G. M. Power and R. P. Barnes: Relationships between metamorphism and structure on the northern edge of eastern Avalonia in the Manx Group, Isle of Man / Geological Society, London, Special Publications, 160:289-305, doi:10.1144/GSL.SP.1999.160.01.19 --- Regional Comparisons --- R. P. Barnes and P. Stone: Trans-Iapetus contrasts in the geological development of southern Scotland (Laurentia) and the Lakesman Terrane (Avalonia) / Geological Society, London, Special Publications, 160:307-323, doi:10.1144/GSL.SP.1999.160.01.20 --- P. Stone, A. H. Cooper, and J. A. Evans: The Skiddaw Group (English Lake District) reviewed: early Palaeozoic sedimentation and tectonism at the northern margin of Avalonia / Geological Society, London, Special Publications, 160:325-336, doi:10.1144/GSL.SP.1999.160.01.21 --- B. J. McConnell, J. H. Morris, and P. S. Kennan: A comparison of the Ribband Group (southeastern Ireland) to the Manx Group (Isle of Man) and Skiddaw Group (northwestern England) / Geological Society, London, Special Publications, 160:337-343, doi:10.1144/GSL.SP.1999.160.01.22 --- Bibliography --- Eva Wilson: A bibliography of the geology of the Isle of Man / Geological Society, London, Special Publications, 160:345-361, doi:10.1144/GSL.SP.1999.160.01.23

Seiten: Online-Ressource (VI, 370 Seiten) , Illustrationen, Diagramme, Karten

ISBN: 1862390460

URL: http://sp.lyellcollection.org/content/160/1

Sprache: Englisch

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Uplift, Erosion and Stability : Perspectives on Long-term Landscape Development (1999)

Geological Society (London, U.K.) ; Smith, Bernard J. ; Whalley, W. Brian ; [weitere]

London : The Geological Society

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Schlagwort(e): Abtragung ; Geologie ; Hebung (Geologie) ; Landschaftsentwicklung ; Geomorphologie ; Strukturgeologie

Beschreibung / Inhaltsverzeichnis: B. J. Smith, W. B. Whalley, P. A. Warke, and A. Ruffell: Introduction and background: interpretations of landscape change / Geological Society, London, Special Publications, 162:vii-x, doi:10.1144/GSL.SP.1999.162.01.01 --- The British Isles --- David K. C. Jones: Evolving models of the Tertiary evolutionary geomorphology of southern England, with special reference to the Chalklands / Geological Society, London, Special Publications, 162:1-23, doi:10.1144/GSL.SP.1999.162.01.02 --- David K. C. Jones: On the uplift and denudation of the Weald / Geological Society, London, Special Publications, 162:25-43, doi:10.1144/GSL.SP.1999.162.01.03 --- Peter Walsh, Michael Boulter, and Iwona Morawiecka: Chattian and Miocene elements in the modern landscape of western Britain and Ireland / Geological Society, London, Special Publications, 162:45-63, doi:10.1144/GSL.SP.1999.162.01.04 --- Y. Battiau-Queney: Crustal anisotropy and differential uplift: their role in long-term landform development / Geological Society, London, Special Publications, 162:65-74, doi:10.1144/GSL.SP.1999.162.01.05 --- Mainland Europe and Scandinavia --- Väino Puura, Rein Vaher, and Igor Tuuling: Pre-Devonian landscape of the Baltic Oil-Shale Basin, NW of the Russian Platform / Geological Society, London, Special Publications, 162:75-83, doi:10.1144/GSL.SP.1999.162.01.06 --- Karna Lidmar-Bergström: Uplift histories revealed by landforms of the Scandinavian domes / Geological Society, London, Special Publications, 162:85-91, doi:10.1144/GSL.SP.1999.162.01.07 --- Piotr Migoń: Inherited landscapes of the Sudetic Foreland (SW Poland) and implications for reconstructing uplift and erosional histories of upland terrains in Central Europe / Geological Society, London, Special Publications, 162:93-107, doi:10.1144/GSL.SP.1999.162.01.08 --- Roberto Basili, Fabrizio Galadini, and Paolo Messina: The application of palaeolandsurface analysis to the study of recent tectonics in central Italy / Geological Society, London, Special Publications, 162:109-117, doi:10.1144/GSL.SP.1999.162.01.09 --- Carlo Bartolini: An overview of Pliocene to present-day uplift and denudation rates in the Northern Apennine / Geological Society, London, Special Publications, 162:119-125, doi:10.1144/GSL.SP.1999.162.01.10 --- Africa and the Middle East --- Alastair W. Baird and Andrew J. Russell: Structural and stratigraphic perspectives on the uplift and erosional history of Djebel Cherichira and Oued Grigema, a segment of the Tunisian Atlas thrust front / Geological Society, London, Special Publications, 162:127-142, doi:10.1144/GSL.SP.1999.162.01.11 --- R. W. H. Butler and S. Spencer: Landscape evolution and the preservation of tectonic landforms along the northern Yammouneh Fault, Lebanon / Geological Society, London, Special Publications, 162:143-156, doi:10.1144/GSL.SP.1999.162.01.12 --- Mats G. Eriksson: Influence of crustal movements on landforms, erosion and sediment deposition in the Irangi Hills, central Tanzania / Geological Society, London, Special Publications, 162:157-168, doi:10.1144/GSL.SP.1999.162.01.13 --- Asia --- David N. Petley and Sharon Reid: Uplift and landscape stability at Taroko, eastern Taiwan / Geological Society, London, Special Publications, 162:169-181, doi:10.1144/GSL.SP.1999.162.01.14 --- P. A. Fothergill and H. Ma: Preliminary observations on the geomorphic evolution of the Guide Basin, Qinghai Province, China: implications for the uplift of the northeast margin of the Tibetan Plateau / Geological Society, London, Special Publications, 162:183-200, doi:10.1144/GSL.SP.1999.162.01.15 --- Lewis A. Owen, W. Dickson Cunningham, Brian F. Windley, J. Badamgarov, and D. Dorjnamjaa: The landscape evolution of Nemegt Uul: a late Cenozoic transpressional uplift in the Gobi Altai, southern Mongolia / Geological Society, London, Special Publications, 162:201-218, doi:10.1144/GSL.SP.1999.162.01.16 --- The Americas --- Catherine T. Conrad and Houston C. Saunderson: Temporal and spatial variation in suspended sediment yields from eastern North America / Geological Society, London, Special Publications, 162:219-228, doi:10.1144/GSL.SP.1999.162.01.17 --- Carlos H. Costa, Aldo D. Giaccardi, and Emilio F. González Díaz: Palaeolandsurfaces and neotectonic analysis in the southern Sierras Pampeanas, Argentina / Geological Society, London, Special Publications, 162:229-238, doi:10.1144/GSL.SP.1999.162.01.18 --- Mauro Coltorti and Cliff D. Ollier: The significance of high planation surface in the Andes of Ecuador / Geological Society, London, Special Publications, 162:239-253, doi:10.1144/GSL.SP.1999.162.01.19 --- Antarctica --- M. A. Summerfield, D. E. Sugden, G. H. Denton, D. R. Marchant, H. A. P. Cockburn, and F. M. Stuart: Cosmogenic isotope data support previous evidence of extremely low rates of denudation in the Dry Valleys region, southern Victoria Land, Antarctica / Geological Society, London, Special Publications, 162:255-267, doi:10.1144/GSL.SP.1999.162.01.20

Seiten: Online-Ressource (X, 278 Seiten) , Illustrationen, Diagramme, Karten

ISBN: 1862390479

URL: http://sp.lyellcollection.org/content/162/1

Sprache: Englisch

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The Tectonics, Sedimentation and Palaeoceanography of the North Atlantic Region (1995)

Geological Society (London, U.K.) ; Scrutton, Roger A. ; Stoker, M. S. ; [weitere]

London : The Geological Society

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Schlagwort(e): Atlantischer Raum (Nord) ; Geologie ; Paläoozeanographie ; Sedimentation ; Tektonik ; Failles (Géologie) - Atlantique Nord, Région de l' ; Failles (Géologie) - Terre-Neuve-et-Labrador ; Geologia historica ; North Atlantic Region ; Paleoceanography ; Paléo-océanographie - Atlantique Nord, Région de l' ; Plate tectonics ; Sedimentation and deposition ; Sedimentologia ; Sédimentation (Géologie) - Atlantique Nord, Région de l' ; Tectonique des plaques - Atlantique Nord, Région de l'

Beschreibung / Inhaltsverzeichnis: Neal W. Driscoll, John R. Hogg, Nicholas Christie-Blick, and Garry D. Karner: Extensional tectonics in the Jeanne d’Arc Basin, offshore Newfoundland: implications for the timing of break-up between Grand Banks and Iberia / Geological Society, London, Special Publications, 90:1-28, doi:10.1144/GSL.SP.1995.090.01.01 --- Iain K. Sinclair: Sequence stratigraphic response to Aptian-Albian rifting in conjugate margin basins: a comparison of the Jeanne d’Arc Basin, offshore Newfoundland, and the Porcupine Basin, offshore Ireland / Geological Society, London, Special Publications, 90:29-49, doi:10.1144/GSL.SP.1995.090.01.02 --- C. C. Ebdon, P. J. Granger, H. D. Johnson, and A. M. Evans: Early Tertiary evolution and sequence stratigraphy of the Faeroe-Shetland Basin: implications for hydrocarbon prospectivity / Geological Society, London, Special Publications, 90:51-69, doi:10.1144/GSL.SP.1995.090.01.03 --- G. Boillot, M. O. Beslier, C. M. Krawczyk, D. Rappin, and T. J. Reston: The formation of passive margins: constraints from the crustal structure and segmentation of the deep Galicia margin, Spain / Geological Society, London, Special Publications, 90:71-91, doi:10.1144/GSL.SP.1995.090.01.04 --- T. J. Reston, C. M. Krawczyk, and H.-J. Hoffmann: Detachment tectonics during Atlantic rifting: analysis and interpretation of the S reflection, the west Galicia margin / Geological Society, London, Special Publications, 90:93-109, doi:10.1144/GSL.SP.1995.090.01.05 --- Liselotte Kiørboe and Steen Agerlin Petersen: Seismic investigation of the Faeroe basalts and their substratum / Geological Society, London, Special Publications, 90:111-123, doi:10.1144/GSL.SP.1995.090.01.06 --- K. Vanneste, J.-P. Henriet, J. Posewang, and F. Theilen: Seismic stratigraphy of the Bill Bailey and Lousy Bank area: implications for subsidence history / Geological Society, London, Special Publications, 90:125-139, doi:10.1144/GSL.SP.1995.090.01.07 --- Morten Sparre Andersen and Lars Ole Boldreel: Effect of Eocene-Miocene Compression Structures on Bottom-Water Currents in the Faeroe-Rockall Area / Geological Society, London, Special Publications, 90:141-143, doi:10.1144/GSL.SP.1995.090.01.08 --- Lars Ole Boldreel and Morten Sparre Andersen: The relationship between the distribution of Tertiary sediments, tectonic processes and deep-water circulation around the Faeroe Islands / Geological Society, London, Special Publications, 90:145-158, doi:10.1144/GSL.SP.1995.090.01.09 --- M. S. Stoker: The influence of glacigenic sedimentation on slope-apron development on the continental margin off Northwest Britain / Geological Society, London, Special Publications, 90:159-177, doi:10.1144/GSL.SP.1995.090.01.10 --- Regin Waagstein and Claus Heilmann-Clausen: Petrography and biostratigraphy of Palaeogene volcaniclastic sediments dredged from the Faeroes shelf / Geological Society, London, Special Publications, 90:179-197, doi:10.1144/GSL.SP.1995.090.01.11 --- E. J. W. Jones, S. C. Cande, and F. Spathopoulos: Evolution of a major oceanographic pathway: the equatorial atlantic / Geological Society, London, Special Publications, 90:199-213, doi:10.1144/GSL.SP.1995.090.01.12 --- Morten Sparre Andersen and Lars Ole Boldreel: Tertiary compression structures in the Faeroe-Rockall area / Geological Society, London, Special Publications, 90:215-216, doi:10.1144/GSL.SP.1995.090.01.13 --- Simon K. Haslett: Pliocene-Pleistocene radiolarian biostratigraphy and palaeoceanography of the North Atlantic / Geological Society, London, Special Publications, 90:217-225, doi:10.1144/GSL.SP.1995.090.01.14 --- John B. Hunt, Nigel G. T. Fannin, Peter G. Hill, and J. Douglas Peacock: The tephrochronology and radiocarbon dating of North Atlantic, Late-Quaternary sediments: an example from the St. Kilda Basin / Geological Society, London, Special Publications, 90:227-248, doi:10.1144/GSL.SP.1995.090.01.15 --- K. Thomson and R. R. Hillis: Tertiary structuration and erosion of the Inner Moray Firth / Geological Society, London, Special Publications, 90:249-269, doi:10.1144/GSL.SP.1995.090.01.16 --- C. N. Wold: Palaeobathymetric reconstruction on a gridded database: the northern North Atlantic and southern Greenland-Iceland-Norwegian sea / Geological Society, London, Special Publications, 90:271-302, doi:10.1144/GSL.SP.1995.090.01.17

Seiten: Online-Ressource (309 Seiten) , Illustrationen, Diagramme, Karten

ISBN: 1897799276

URL: http://sp.lyellcollection.org/content/90/1

Sprache: Englisch

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Non-biostratigraphical Methods of Dating and Correlation (1995)

Geological Society (London, U.K.) ; Dunay, R. E. ; Hailwood, E. A.

London : The Geological Society

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Schlagwort(e): Altersbestimmung ; Geochronologie ; Geologie ; Geologische Korrelation ; Lithostratigraphie ; Physikalische Altersbestimmung ; Isotopendatierung ; Geochemie ; Lumineszenz

Beschreibung / Inhaltsverzeichnis: R. E. Dunay and E. A. Hailwood: Non-biostratigraphical methods of dating and correlation: an introduction / Geological Society, London, Special Publications, 89:1-2, doi:10.1144/GSL.SP.1995.089.01.01 --- Andrew Morton and Andrew Hurst: Correlation of sandstones using heavy minerals: an example from the Statfjord Formation of the Snorre Field, northern North Sea / Geological Society, London, Special Publications, 89:3-22, doi:10.1144/GSL.SP.1995.089.01.02 --- Maria A. Mange-Rajetzky: Subdivision and correlation of monotonous sandstone sequences using high-resolution heavy mineral analysis, a case study: the Triassic of the Central Graben / Geological Society, London, Special Publications, 89:23-30, doi:10.1144/GSL.SP.1995.089.01.03 --- C. V. Jeans: Clay mineral stratigraphy in Palaeozoic and Mesozoic red bed facies onshore and offshore UK / Geological Society, London, Special Publications, 89:31-55, doi:10.1144/GSL.SP.1995.089.01.04 --- Andrew Carter, Charles S. Bristow, and Anthony J. Hurford: The application of fission track analysis to the dating of barren sequences: examples from red beds in Scotland and Thailand / Geological Society, London, Special Publications, 89:57-68, doi:10.1144/GSL.SP.1995.089.01.05 --- A. Racey, M. A. Love, R. M. Bobolecki, and J. N. Walsh: The use of chemical element analyses in the study of biostratigraphically barren sequences: an example from the Triassic of the central North Sea (UKCS) / Geological Society, London, Special Publications, 89:69-105, doi:10.1144/GSL.SP.1995.089.01.06 --- Timothy J. Pearce and Ian Jarvis: High-resolution chemostratigraphy of Quaternary distal turbidites: a case study of new methods for the analysis and correlation of barren sequences / Geological Society, London, Special Publications, 89:107-143, doi:10.1144/GSL.SP.1995.089.01.07 --- John Roberts, Jonathan Claoue-Long, Peter J. Jones, and Clinton B. Foster: SHRIMP zircon age control of Gondwanan sequences in Late Carboniferous and Early Permian Australia / Geological Society, London, Special Publications, 89:145-174, doi:10.1144/GSL.SP.1995.089.01.08 --- Jonathan Russell: Direct Pb/Pb dating of Silurian macrofossils from Gotland, Sweden / Geological Society, London, Special Publications, 89:175-200, doi:10.1144/GSL.SP.1995.089.01.09 --- A. Dalland, E. W. Mearns, and J. J. McBride: The application of samarium-neodymium (Sm-Nd) Provenance Ages to correlation of biostratigraphically barren strata: a case study of the Statfjord Formation in the Gullfaks Oilfield, Norwegian North Sea / Geological Society, London, Special Publications, 89:201-222, doi:10.1144/GSL.SP.1995.089.01.10 --- H. M. Rendell: Luminescence dating of Quaternary sediments / Geological Society, London, Special Publications, 89:223-235, doi:10.1144/GSL.SP.1995.089.01.11 --- Chang-Shu Yang and Wim F. P. Kouwe: Wireline log-cyclicity analysis as a tool for dating and correlating barren strata: an example from the Upper Rotliegend of The Netherlands / Geological Society, London, Special Publications, 89:237-259, doi:10.1144/GSL.SP.1995.089.01.12

Seiten: Online-Ressource (265 Seiten) , Illustrationen, Diagramme, Karten

ISBN: 1897799306

URL: http://sp.lyellcollection.org/content/89/1

Sprache: Englisch

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The Mediterranean Basins : Tertiary Extension within the Alpine Orogen (1999)

Geological Society (London, U.K.) ; Durand, Bernard ; Jolivet, Laurent ; [weitere]

London : The Geological Society

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Schlagwort(e): Becken (Geologie) ; Cergy (1996) ; Geologie ; Mittelmeer ; Pannonisches Becken ; Basins (Geology) ; Mediterranean region ; Orogeny ; Alpine region ; Geology, Stratigraphic ; Geology, Cenozoic

Beschreibung / Inhaltsverzeichnis: B. Durand and L. Jolivet: Foreword / Geological Society, London, Special Publications, 156:vii-ix, doi:10.1144/GSL.SP.1999.156.01.01 --- L. Jolivet, D. Frizon de Lamotte, A. Mascle, and M. Séranne: The Mediterranean Basins: Tertiary Extension within the Alpine Orogen — an introduction / Geological Society, London, Special Publications, 156:1-14, doi:10.1144/GSL.SP.1999.156.01.02 --- Western Mediterranean --- Michel Séranne: The Gulf of Lion continental margin (NW Mediterranean) revisited by IBS: an overview / Geological Society, London, Special Publications, 156:15-36, doi:10.1144/GSL.SP.1999.156.01.03 --- N. Chamot-Rooke, J.-M. Gaulier, and F. Jestin: Constraints on Moho depth and crustal thickness in the Liguro-Provençal basin from a 3D gravity inversion: geodynamic implications / Geological Society, London, Special Publications, 156:37-61, doi:10.1144/GSL.SP.1999.156.01.04 --- J. Vergés and F. Sàbat: Constraints on the Neogene Mediterranean kinematic evolution along a 1000 km transect from Iberia to Africa / Geological Society, London, Special Publications, 156:63-80, doi:10.1144/GSL.SP.1999.156.01.05 --- A. Benedicto, M. Séguret, and P. Labaume: Interaction between faulting, drainage and sedimentation in extensional hanging-wall syncline basins: example of the Oligocene Matelles basin (Gulf of Lion rifted margin, SE France) / Geological Society, London, Special Publications, 156:81-108, doi:10.1144/GSL.SP.1999.156.01.06 --- H. P. Zeck: Alpine plate kinematics in the western Mediterranean: a westward-directed subduction regime followed by slab roll-back and slab detachment / Geological Society, London, Special Publications, 156:109-120, doi:10.1144/GSL.SP.1999.156.01.07 --- Alain Mascle and Roland Vially: The petroleum systems of the Southeast Basin and Gulf of Lion (France) / Geological Society, London, Special Publications, 156:121-140, doi:10.1144/GSL.SP.1999.156.01.08 --- Marjorie Wilson and Gianluca Bianchini: Tertiary-Quaternary magmatism within the Mediterranean and surrounding regions / Geological Society, London, Special Publications, 156:141-168, doi:10.1144/GSL.SP.1999.156.01.09 --- A. Mauffret and I. Contrucci: Crustal structure of the North Tyrrhenian Sea: first result of the multichannel seismic LISA cruise / Geological Society, London, Special Publications, 156:169-193, doi:10.1144/GSL.SP.1999.156.01.10 --- Pannonian Basin --- Frank Horváth and Gábor Tari: IBS Pannonian Basin project: a review of the main results and their bearings on hydrocarbon exploration / Geological Society, London, Special Publications, 156:195-213, doi:10.1144/GSL.SP.1999.156.01.11 --- Gábor Tari, Péter Dövényi, István Dunkl, Frank Horváth, László Lenkey, Mihai Stefanescu, Péter Szafián, and Tamás Tóth: Lithospheric structure of the Pannonian basin derived from seismic, gravity and geothermal data / Geological Society, London, Special Publications, 156:215-250, doi:10.1144/GSL.SP.1999.156.01.12 --- István Györfi, László Csontos, and András Nagymarosy: Early Tertiary structural evolution of the border zone between the Pannonian and Transylvanian Basins / Geological Society, London, Special Publications, 156:251-267, doi:10.1144/GSL.SP.1999.156.01.13 --- P. Gerner, G. Bada, P. Dövényi, B. Müller, M. C. Oncescu, S. Cloetingh, and F. Horváth: Recent tectonic stress and crustal deformation in and around the Pannonian Basin: data and models / Geological Society, London, Special Publications, 156:269-294, doi:10.1144/GSL.SP.1999.156.01.14 --- László Fodor, László Csontos, Gábor Bada, István Györfi, and László Benkovics: Tertiary tectonic evolution of the Pannonian Basin system and neighbouring orogens: a new synthesis of palaeostress data / Geological Society, London, Special Publications, 156:295-334, doi:10.1144/GSL.SP.1999.156.01.15 --- E. Juhász, L. Phillips, P. Müller, B. Ricketts, Á. Tóth-Makk, M. Lantos, and L. Ó. Kovács: Late Neogene sedimentary facies and sequences in the Pannonian Basin, Hungary / Geological Society, London, Special Publications, 156:335-356, doi:10.1144/GSL.SP.1999.156.01.16 --- Marco Sacchi, Frank Horváth, and Orsolya Magyari: Role of unconformity-bounded units in the stratigraphy of the continental record: a case study from the Late Miocene of the western Pannonian Basin, Hungary / Geological Society, London, Special Publications, 156:357-390, doi:10.1144/GSL.SP.1999.156.01.17 --- R. T. Van Balen, L. Lenkey, F. Horváth, and S. A. P. L. Cloetingh: Two-dimensional modelling of stratigraphy and compaction-driven fluid flow in the Pannonian Basin / Geological Society, London, Special Publications, 156:391-414, doi:10.1144/GSL.SP.1999.156.01.18 --- Eastern Mediterranean --- Denis Hatzfeld: The present-day tectonics of the Aegean as deduced from seismicity / Geological Society, London, Special Publications, 156:415-426, doi:10.1144/GSL.SP.1999.156.01.19 --- L. Jolivet and M. Patriat: Ductile extension and the formation of the Aegean Sea / Geological Society, London, Special Publications, 156:427-456, doi:10.1144/GSL.SP.1999.156.01.20 --- A. L. W. Lips, J. R. Wijbrans, and S. H. White: New insights from 40Ar/39Ar laserprobe dating of white mica fabrics from the Pelion Massif, Pelagonian Zone, Internal Hellenides, Greece: implications for the timing of metamorphic episodes and tectonic events in the Aegean region / Geological Society, London, Special Publications, 156:457-474, doi:10.1144/GSL.SP.1999.156.01.21 --- Aral I. Okay and Okan Tüysüz: Tethyan sutures of northern Turkey / Geological Society, London, Special Publications, 156:475-515, doi:10.1144/GSL.SP.1999.156.01.22 --- General --- P. A. Ziegler and F. Roure: Petroleum systems of Alpine-Mediterranean foldbelts and basins / Geological Society, London, Special Publications, 156:517-540, doi:10.1144/GSL.SP.1999.156.01.23 --- C. Doglioni, E. Gueguen, P. Harabaglia, and F. Mongelli: On the origin of west-directed subduction zones and applications to the western Mediterranean / Geological Society, London, Special Publications, 156:541-561, doi:10.1144/GSL.SP.1999.156.01.24

Seiten: Online-Ressource (IX, 569 Seiten) , Illustrationen, Diagramme, Karten

ISBN: 1862390339

URL: http://sp.lyellcollection.org/content/156/1

Sprache: Englisch

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Geological Data Management (1995)

Geological Society (London, U.K.) ; Giles, Jeremy R. A.

London : The Geological Society

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Schlagwort(e): Datenverarbeitung ; Geologie ; Géologie - Bases de données

Beschreibung / Inhaltsverzeichnis: Jeremy R. A. Giles: The what, why, when, how, where and who of geological data management / Geological Society, London, Special Publications, 97:1-4, doi:10.1144/GSL.SP.1995.097.01.01 --- Database design --- Ken Rasmussen: An overview of database analysis and design for geological systems / Geological Society, London, Special Publications, 97:5-11, doi:10.1144/GSL.SP.1995.097.01.02 --- K. J. Chew: Data modelling a general-purpose petroleum geological database / Geological Society, London, Special Publications, 97:13-23, doi:10.1144/GSL.SP.1995.097.01.03 --- J. S. Coats and J. R. Harris: Database design in geochemistry: BGS experience / Geological Society, London, Special Publications, 97:25-32, doi:10.1144/GSL.SP.1995.097.01.04 --- J. R. A. Giles and K. A. Bain: The nature of data on a geological map / Geological Society, London, Special Publications, 97:33-40, doi:10.1144/GSL.SP.1995.097.01.05 --- Michael R. Saunders, John A. Shields, and Michael R. Taylor: Improving the value of geological data: a standardized data model for industry / Geological Society, London, Special Publications, 97:41-53, doi:10.1144/GSL.SP.1995.097.01.06 --- M. Lhotak and M. C. Boulter: Towards the creation of an international database of palaeontology / Geological Society, London, Special Publications, 97:55-64, doi:10.1144/GSL.SP.1995.097.01.07 --- D. G. Toll and A. J. Oliver: Structuring soil and rock descriptions for storage in geotechnical databases / Geological Society, London, Special Publications, 97:65-71, doi:10.1144/GSL.SP.1995.097.01.08 --- S. C. R. Mallender: The use of text databases in the management of exploration data / Geological Society, London, Special Publications, 97:73-79, doi:10.1144/GSL.SP.1995.097.01.09 --- Data Management --- D. J. Lowe: The geological data manager: an expanding role to fill a rapidly growing need / Geological Society, London, Special Publications, 97:81-90, doi:10.1144/GSL.SP.1995.097.01.10 --- Paul R. Duller: The quality assurance of geological data / Geological Society, London, Special Publications, 97:91-95, doi:10.1144/GSL.SP.1995.097.01.11 --- Stephen Henley: Project databases: standards and security / Geological Society, London, Special Publications, 97:97-101, doi:10.1144/GSL.SP.1995.097.01.12 --- Roy K. Lowry and Raymond N. Cramer: Database applications supporting Community Research Projects in NERC marine sciences / Geological Society, London, Special Publications, 97:103-107, doi:10.1144/GSL.SP.1995.097.01.13 --- Roy K. Lowry and Stephen G. Loch: Transfer and SERPLO: powerful data quality control tools developed by the British Oceanographic Data Centre / Geological Society, London, Special Publications, 97:109-115, doi:10.1144/GSL.SP.1995.097.01.14 --- R. C. Bowie: Data management in the National Geological Records Centre / Geological Society, London, Special Publications, 97:117-125, doi:10.1144/GSL.SP.1995.097.01.15 --- Richard G. Miller and John S. Gardner: Geoscience data value, cost and management in the oil industry / Geological Society, London, Special Publications, 97:127-135, doi:10.1144/GSL.SP.1995.097.01.16 --- Case Studies --- P. Doorgakant: Groundwater level archive for England and Wales / Geological Society, London, Special Publications, 97:137-144, doi:10.1144/GSL.SP.1995.097.01.17 --- S. Power, M. Scott, G. Robinson, and I. Statham: Database design and data management on the Swansea-Llanelli Earth Science Mapping Project / Geological Society, London, Special Publications, 97:145-155, doi:10.1144/GSL.SP.1995.097.01.18 --- Andrew A. McKenzie: A hydrogeological database for Honduras / Geological Society, London, Special Publications, 97:157-162, doi:10.1144/GSL.SP.1995.097.01.19 --- Stephen G. Allen: CD-ROM and its application to the petroleum industry / Geological Society, London, Special Publications, 97:163-180, doi:10.1144/GSL.SP.1995.097.01.20

Seiten: Online-Ressource (185 Seiten) , Illustrationen, Diagramme, Karten

ISBN: 189779939X

URL: http://sp.lyellcollection.org/content/97/1

Sprache: Englisch

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Absorptionsmechanismen bei Ultraschallwellen in fluidhaltigen Sandsteinen unter verschiedenen Druckbedingungen (1995)

Wulff, Angelika-Maria

Selbstverlag Fachbereich Geowissenschaften, FU Berlin

In: Herausgeberexemplar

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Publikationsdatum: 2024-05-02

Beschreibung: In dieser Arbeit wurden Laborexperimente im Ultraschallfrequenzbereich und begleitende theoretische Untersuchungen durchgeführt, um zu klären, welche Absorptionsmechanismen in fluidhaltigen Sandsteinen bei geringem einaxialen (26 MPa) und bei erhöhtem hydrostatischen Druck (bis 200 Mpa) wirksam sind. Die Kenntnis der Absorptionsmechanismen ist notwendig, um die Zusammenhänge von lithologischen und seismischen Gesteinsparametern zu verstehen und für die Interpretation von seismischen Feldmessungen zu nutzen. Bekannt war bislang, daß unter geringem einaxialen Druck frequenzabhängige lokale Flüssigkeitsströmungen den wesentlichen Absorptionsmechanismus in fluidhaltigem Gestein darstellen. Im Rahmen der vorliegenden Arbeit wurde gezeigt, daß die Kompressionswellengeschwindigkeit in fluidhaltigem Gestein bei höheren Sättigungsgraden zusätzlich von einem partiellen Gesteinsversteifungseffekt beeinflußt wird. Damit gelang eine vollständige Erklärung des sättigungsabhängigen elastischen und anelastischen Gesteinsverhaltens bei geringem einaxialen Druck. Um die Bedeutung der Gesteinsmikrostruktur (z.B. Rißdichte, Kornkontakte) für die seismischen Gesteinsparameter (Geschwindigkeit, Absorption) direkt nachzuweisen, wurde diese bei einem Gestein künstlich, thermisch verändert. Die Änderung der Mikrostruktur führt bei gleichzeitiger vernachlässigbarer Änderung der makroskopischen Gesteinsparameter (Porosität, Permeabilität) zu einer Vergrößerung der Fluideffekte. Mechanismen und Modelle, in welche ausschließlich makroskopische Gesteinsparameter ein- gehen, erfassen nicht die beobachteten Änderungen im Gesteinsverhalten. Nur mit dem auf die Gesteinsmikrostruktur bezogenen Mechanismus lokaler Flüssigkeitsströmungen konnten die Änderungen der Fluidwirkungen erklärt werden. Diese Ergebnisse an verändertem Gestein bieten somit einen direkten Beweis für den grundlegenden Einfluß der Mikrostruktur auf die seismischen Gesteinsparameter. Bislang war nicht geklärt, ob der Mechanismus lokaler Flüssigkeitsströmungen, welcher von der Existenz feiner Spalten im Gestein abhängt, auch unter erhöhtem hydrostatischen Druck das Gesteinsverhalten bestimmt. Zur Untersuchung der Absorptionsmechanismen in Gestein unter erhöhtem Druck wurden Experimente an Sandstein mit verschiedenen Saturanden und Sättigungsgraden durchgeführt. Die experimentellen Ergebnisse zeigen, dass auch unter erhöhtem Druck fluidbedingte Absorptionsmechanismen wirksam sind und auch hier polare Fluide im gesamten Druckbereich eine Modulerniedrigung verursachen. Der Vergleich der experimentellen Ergebnisse mit Modellvorhersagen ergab, daß lokale Flüssigkeitsströmungen den Einfluß unterschiedlicher Fluide auf Geschwindigkeit und Absorption erklären und auch unter hohem hydrostatischen Druck von wesentlicher Bedeutung für die elastischen und anelastischen Gesteinseigenschaften sind. Folglich existieren trotz einer partiellen Rißschließung auch unter hohem hydrostatischen Druck noch Risse und Spalten im Gestein. Die thermische Veränderung der Mikrostruktur eines Gesteins bewirkt eine Geschwindigkeitserniedrigung im trockenen Gestein, welche auch bei hohem hydrostatischen Druck erhalten bleibt, sowie eine Vergrößerung der Fluideffekte. Die Erklärung des geänderten Verhaltens des fluidhaltigen Gesteins gelang mit dem Mechanismus lokaler Flüssigkeitsströmungen. Die Ergebnisse an verändertem Gestein zeigen direkt, daß die Mikrostruktur auch bei hohem hydrostatischen Druck grundlegend für die seismischen Gesteinsparameter ist. Da auch unter erhöhtem hydrostatischem Druck, also unter ’in-situ’-Bedingungen, der frequenzabhängige Mechanismus lokaler Flüssigkeitsströmungen die seismischen Gesteinsparameterwesentlich beeinflußt, muß diese Frequenzabhängigkeit bei der Übertragung von Laborergebnissen auf die Feld- und Bohrlochseismik beachtet werden.

Beschreibung: Laboratory experiments in the ultrasonic frequency range and accompanying theoretical investigations were performed with the aim to clarify which absorption mechanisms are effective in fluid-containing sandstones at low uniaxial pressure (26 MPa) and at elevated hydrostatic pressure (up to 200 MPa). The knowledge of the effective absorption mechanisms is necessary to understand the relation of lithological and seismic rock parameters and to use it for the interpretation of seismic field measurements. Preceding investigations at the TU-Berlin had revealed that at low uniaxial pressure frequency dependent local-fluid-flow is the dominating absorption mechanism in fluid-containing rock and that polar fluids lead to a modulus reduction. Within the scope of the present study the investigations of the seismic rock parameters (velocity, attenuation) at low uniaxial pressure were continued. It was shown that the compressional wave velocity in fluid-containing rock is additionally influenced by a partial rock stiffening effect at higher saturations. With this result a complete explanation of the saturation dependent elastic and anelastic rock behaviour at low uniaxial pressure was achieved. To prove the significance of the rock microstructure (e.g. crack density, crack aspect ratios, grain contact properties) for the seismic rock parameters directly, the microstructure of a sandstone was artificially changed by thermal cracking. With negligible changes of the macroscopic rock parameters (porosity, permeability) the alteration of the microstructure leads to an increase of the fluid effects on the elastic and anelastic rock properties. Mechanisms and models which are solely based on macroscopic rock parameters do not cover the observed changes in the rock behaviour. Only by applying the mechanism of local-fuid-flow related to microstructure the changes in the fluid effects can be explained. Thus these results obtained on thermally changed rock are a direct prove of the fundamental influence of the microstructure on the seismic rock parameters. Until now it has not yet been clarified whether the mechanism of local-fluid-flow which depends on the existence of narrow cracks in rock also determines the rock behaviour under elevated hydrostatic pressure. To investigate the absorption mechanisms in rock under elevated pressure ultrasonic measurements were performed on sandstone with different saturands and degrees of saturation. The experimental results reveal that under elevated pressure fluid dependent attenuation mechanisms are effective too and polar fluids cause a modulus reduction in the entire pressure range. The comparison of the experimental results with model predictions reveals that local-fluid-flow explains the influence of different fluids on the velocity and attenuation and that this mechanism is of essential significance for the elastic and anelastic rock properties even under high hydrostatic pressure. Consequently despite a partial crack closure sufficient fine cracks exist even under high hydrostatic pressure. The thermal alteration of the microstructure of a rock leads to a velocity decrease in the dry rock which is preserved at high hydrostatic pressure, as well as to an increase of the fluid effects. The explanation of the changed behaviour of the fluid-containing rock was achieved by means of the mechanism of local-fluid-flow. The results obtained on altered rock directly demonstrate that the microstructure is of fundamental significance for the seismic rock parameters at high hydrostatic pressure too. Depending on the rock microstructure the mechanism of local-fluid-flow may cause attenuation and dispersion in all frequency ranges. Since it has been shown in this study that also under elevated hydrostatic pressure, i.e. under ’in-situ’conditions, this frequency dependent mechanism essentially influences the seismic rock parameters, the frequency dependence must be taken into account by extrapolating laboratory results to field and borehole seismic.

Beschreibung: thesis

Beschreibung: DFG, SUB Göttingen

Schlagwort(e): ddc:550 ; Geophysik ; Sandstein ; Ultraschall ; Absorption

Sprache: Deutsch

Materialart: doc-type:book

Format: 180

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Die Verteilung der Absorption seismischer Wellen in den westlichen Zentralen Anden (1999)

Haberland, Christian

Selbstverlag Fachbereich Geowissenschaften, FU Berlin

In: Herausgeberexemplar

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Publikationsdatum: 2024-05-03

Beschreibung: Subduktionszonen gehören zu den geologisch aktivsten Regionen der Erde. Viele der Prozesse in diesen Zonen laufen unter der Beteiligung von Fluiden ab und führen zu Aufschmelzung und Vulkanismus. Der Parameter der Absorption seismischer Wellen in der Erde (Kruste, Mantel) wird entscheidend von Größen wie der Temperatur, der Porosität, dem Umgebungsdruck oder der Sättigung mit wässrigen Fluiden oder (partiellen) Schmelzen gesteuert. Er eignet sich demnach hervorragend zur Untersuchung des Zustandes von Kruste und Erdmantel und den Prozessen in einer Subduktionszone. Für die Absorptionsuntersuchungen in der Subduktionszone in den westlichen Zentralen Anden standen die Daten der beiden seismologischen Experimente PISCO ’94 und ANCORP ’96 zur Verfügung. Diese Projekte wurden vom Sonderforschungsbereich 267 ’’Deformationsprozesse in den Anden”, der Freien Universität Berlin und dem GeoForschungsZentrum Potsdam finanziert und gemeinsam mit südamerikanischen Partnern durchgeführt. So wurden in den Jahren 1994 und 1996/97 für jeweils rund 3 Monate seismologische Stationsnetze in Nord-Chile und Süd-Bolivien betrieben, die weite Bereiche des forearc und des magmatischen Bogens sowie Teile des Altiplano zwischen 21° und 24° S umfaßten. Sie registrierten eine große Anzahl überwiegend lokaler Ereignisse aus der Wadati-Benioff-Zone. Für die Absorptionsuntersuchungen konnten insgesamt 904 Ereignisse mit 11.738 P-Phasen des PISCO ’94-Experiments bzw. 686 Ereignisse mit 10.544 P-Phasen des ANCORP ’96- Experiments verwendet werden. Die Berechnung der Absorption der einzelnen Strahlen erfolgte (automatisch) aus den Amplitudenspektren der P-Wellen Einsätze. Es wurde ein Frequenzband von 3 bis maximal 30 Hz analysiert, in dem ein frequenzunabhängiger Qualitätsfaktor Q angenommen wurde. Dabei kamen zwei unterschiedliche Methoden, Spektralverhältnisse und Spektralinversion, zur Anwendung, um der prinzipiellen Schwierigkeit der Trennung von Quell- und Weg-Effekten zu begegnen und Annahmen beispielsweise über die Quellfunktion zu überprüfen. Eine Spektralinversion nach individuellen t*-Operatoren und Plateauwerten und einer für ein Beben gemeinsamen Eckfrequenz konnte erfolgreich angewendet werden. Die so bestimmten Absorptionswerte (t*-Operatoren) wurden für eine damped least squares-Inversion zur Berechnung der dreidimensionalen Absorptionsstruktur im Untergrund verwendet. Das raytracing wurde dabei in den dreidimensionalen Geschwindigkeitsmodellen durchgeführt, um den genauen Strahlverlauf zu berücksichtigen. Die errechneten Modelle erlauben einen detaillierten Einblick in die Subduktionszone der Zentralen Anden. Der Bereich unterhalb des arcs zwischen 21,5° und 24° S ist geprägt von einer prominenten Anomalie geringer Q-Werte, die von der Kruste bis in den oberen Mantel reicht. Große Stationskorrekturen der Stationen im arc und dem Altiplano deuten auf eine Erstreckung bis an die Oberfläche hin. Die krustale Absorption verläuft deckungsgleich mit der Verbreitung des rezenten Vulkanismus. Südlich von 22° S verläuft die Absorptionsanomalie bis in eine Tiefe von 250 km genau oberhalb der abtauchenden Nazca-Platte. Nördlich von 22° S scheint die starke Absorption auf den Bereich oberhalb von ca. 100 km begrenzt. In diesem nördlichen Bereich, in dem generell eine geringere Absorption verzeichnet wird, korrespondiert diese Zone mit dem dort angesiedelten Beben-cluster in ca. 100 km Tiefe; nördlich von 21° S verliert sie sich. Der forearc zeigt sich als relativ homogene, gering absorbierende Struktur mit Q-Werten um 1000; die abtauchende Platte weist ebenfalls hohe Q-Werte auf. Bedingt durch die Lage der Absorptionsanomalien relativ zu den seismologischen Netzen und die damit verbundene geringere Durchstrahlung war eine detaillierte Untersuchung der Auflösung der Modelle notwendig. Dazu wurden die aus der Modellresolutionsmatrix abgeleiteten Größen wie die spread-function berücksichtigt, aber auch synthetische Tests an Modellen mit oszillierenden Strukturen (Schachbrettmustern) und ’’realistischen” Untergrundmodellen vorgenommen. Sie zeigen, daß große Bereiche des forearcs und arcs in den Modellen sehr gut aufgelöst werden. Die gefundenen Anomalien lassen sich unter verschiedenen Gesichtspunkten diskutieren. Die ausgeprägte krustale Absorption unter großen Teilen der Westkordillere läßt sich mit der schon früher abgeleiteten Präsenz partieller Schmelzen erklären. Sie korreliert sehr gut mit der Verteilung des rezenten Vulkanismus, erniedrigten Durchschnittsgeschwindigkeiten, einem erhöhten vp/vs-Verhältnis, z.T. extrem erhöhten elektrischen Leitfähigkeiten und Bereichen, für die anomale Geschwindigkeits-Dichte Relationen angenommen werden müssen. Variationen innerhalb dieser krustalen Anomalien weisen auf eine unterschiedlich ausgeprägte Durchdringung mit partiellen Schmelzen hin. Die Anomalien im oberen Mantel deuten auf ein unterschiedliches Vordringen der heißen Asthenosphäre unter den magmatischen Bogen hin. Darüber hinaus können sie als Bereiche partieller Schmelzen und Fluide interpretiert werden, die Dehydratisierungs- und Hydratisierungsprozesse in dieser Subduktionszone widerspiegeln.

Beschreibung: Subduction zones are among the geologically most active regions of the world. Many processes in these zones take place under the influence of fluids and lead to the generation of melts and volcanism. Attenuation of seismic waves in crust and mantle depends strongly on parameters like temperature, porosity, confining pressure or saturation with hydrous fluids or partial melts. Therefore, this parameter is perfectly suited to examine the state of the crust and mantle in subduction zones. For the attenuation studies in the subduction zone of the western Central Andes datasets of two seismological experiments, PISCO ’94 and ANCORP ’96, were used. These projects were financed by the Collaborative Research Center 267 ’’Deformation Processes in the Andes”, the GeoForschungsZentrum Potsdam and the Department of Geophysics of the Free University of Berlin and were executed in cooperation with partners from South America. In 1994 and 1996/97 two temporary seismological networks were installed in northern Chile and southern Bolivia covering large areas of the forearc, the magmatic arc and the Altiplano between 21° and 24° S. They monitored a large number of earthquakes predominantly situated in the Wadati-Benioff zone. From the PISCO ’94 and ANCORP ’96 datasets 904 events with 11.738 attenuation values respectively 686 events with 10.544 values could be used for the tomography. Whole-path attenuation was (automatically) determined from the amplitude spectra of the F- waves. In a frequency-band between 3 and 30 Hz a frequency-independent Quality-factor Qp was assumed. In order to separate source- and path-effects two different methods were applied, spectral inversion, and spectral ratios relative to a constant reference station. The spectral inversion for individual C-operators and plateau-values and a single source corner frequency for all observations of an event was applied successfully. In a damped least squares approach the t*-operators were inverted for the three-dimensional attenuation structure. To account for the spatial distribution of both velocity and attenuation raytracing was performed in the three-dimensional velocity structure previously derived by simultaneous inversions of travel-time data. The obtained models allow a detailed insight into the subduction zone of the Central Andes. Crust and mantle of the forearc and subducting slab are generally characterized by low attenuation (Qp 〉 1000). Beneath the Western Cordillera, the recent magmatic arc, a prominent attenuation anomaly is found (Qp 〈 100). This anomaly reaches from the uppermost crust down to the upper mantle at a depth of 250 km. North-South variations can be seen: The western flank of the crustal attenuation anomaly is congruent to the curved course of the volcanic front. North of 21° S the attenuation is less developed and dies out north of 20° S. A deeper zone of high attenuation is resolved between 22° and 24° S directly above the subducting slab. In the northern part of the study area the low-Qp-zone penetrates westwards in the forearc-mantle. Due to the irregular ray-coverage of the model a detailed analysis of the resolution was necessary. Both, formal analysis of the model resolution matrix (e.g. via spread-function) and tests with synthetic models including checkerboard and ’’realistic” attenuation models were executed. They show that large areas of the models beneath forearc and arc are well resolved. The anomalies found in the tomographic models can be interpreted in several ways. The prominent crustal attenuation beneath the Western Cordillera can be explained by partial melts previously proposed by others. The anomaly correlates well with the distribution of recent volcanism, reduced seismic velocities, reduced electrical resistivity and regions for which anomalous velocity-density relations must be assumed. Variations within the anomaly point towards the irregular distribution of partial melting beneath the volcanic arc. The anomalies within the upper mantle may map the distribution of hot asthenosphere material. Furthermore, they may be interpreted in terms of subduction-related dehydration- and hydration processes.

Beschreibung: thesis

Beschreibung: DFG, SUB Göttingen

Schlagwort(e): ddc:550 ; Subduktion ; Seismische Welle ; Absorption

Sprache: Deutsch

Materialart: doc-type:book

Format: 144

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