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  • Berlin ; Heidelberg : Springer  (31)
  • Oxford [u.a.] : Blackwell  (7)
  • Dordrecht [u.a.] : Kluwer
  • [s.l.]
  • English  (38)
  • Bulgarian
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  • 1985-1989  (38)
  • 1987  (38)
  • 1
    Call number: MR 92.0413
    Type of Medium: Monograph available for loan
    Pages: IX, 355 S.
    Edition: 1st publ.
    ISBN: 0632019018
    Classification:
    Seismology
    Language: English
    Location: Upper compact magazine
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  • 2
    Monograph available for loan
    Monograph available for loan
    Oxford [u.a.] : Blackwell
    Associated volumes
    Call number: 9/M 93.0662
    In: Geological Society special publication
    Description / Table of Contents: Tropical deserts have existed sporodically on our planet from the Precambrian to the Present, and seem not to have been a permanent feature of its surface (Glennie 1987). Depending on their definition, tropical deserts and semi-deserts currently occupy between approximately one fifth and one third of the Earth’s land surface, of which only about 4% is covered by that popular concept of what a desert consists of—sand dunes. The remaining area comprises barren rock (both hill and plateau) with a variable cover of sediments transported by ephemeral streams (wadis, arroyos) to form the deposits at the terminal points of these streams. Varying with the ratio of water supply to the annual potential rate of evaporation, those terminal areas may be occupied by desert lakes that are generally of a temporary nature (permanent only if the water is provided from beyond the margins of the desert or is fed by groundwater), and become more saline as they become desiccated. The end product of such a situation is a salina or sabkha (area of sand, silt or clay, commonly encrusted with halite). There is no universally accepted definition of a desert. In its simplest form it can be defined as a barren tract of land over which rainfall is too limited or spasmodic to support vegetation adequately. Very few desert areas are completely devoid of vegetation, and many areas that fall within a desert in terms of average annual rainfall may have an even though sparse cover of plants that have adapted to the relatively arid environment in which they live. In this context, some writers define deserts as areas that have an average upper limit of 250 mm of annual rainfall, even though it may all fall in one storm and rainfall may not recur for several years. Perhaps more important than the rainfall itself is the ratio between it and the potential rate of evaporation—the aridity or desiccation factor. This is about 1:10 in some parts of the Australian Desert and up to 1:500 in areas of the Sahara (Cooke & Warren 1973).
    Type of Medium: Monograph available for loan
    Pages: XI, 401 S. , zahlr. Ill. u graph. Darst.
    ISBN: 0632019050
    Series Statement: Geological Society special publication 35
    Classification:
    Petrology, Petrography
    Language: English
    Note: Introduction --- K. W. Glennie: Desert sediments: ancient and modern / Geological Society, London, Special Publications, 35:1-4, doi:10.1144/GSL.SP.1987.035.01.01: Fluvial Sediments: Process and Form --- A. P. Schick, J. Lekach, and M. A. Hassan: Vertical exchange of coarse bedload in desert streams / Geological Society, London, Special Publications, 35:7-16, doi:10.1144/GSL.SP.1987.035.01.02 --- S. Grossman and R. Gerson: Fluviatile deposits and morphology of alluvial surfaces as indicators of Quaternary environmental changes in the southern Negev, Israel / Geological Society, London, Special Publications, 35:17-29, doi:10.1144/GSL.SP.1987.035.01.03 --- J. K. Maizels: Plio-Pleistocene raised channel systems of the western Sharqiya (Wahiba), Oman / Geological Society, London, Special Publications, 35:31-50, doi:10.1144/GSL.SP.1987.035.01.04 --- Tectonism, Climatic Change and Fluviatile Desert Sediments --- L. E. Frostick and I. Reid: Tectonic control of desert sediments in rift basins ancient and modern / Geological Society, London, Special Publications, 35:53-68, doi:10.1144/GSL.SP.1987.035.01.05 --- H. Olsen: Ancient ephemeral stream deposits: a local terminal fan model from the Bunter Sandstone Formation (L. Triassic) in the Tønder-3, -4 and -5 wells, Denmark / Geological Society, London, Special Publications, 35:69-86, doi:10.1144/GSL.SP.1987.035.01.06 --- A. M. Harvey: Alluvial fan dissection: relationships between morphology and sedimentation / Geological Society, London, Special Publications, 35:87-103, doi:10.1144/GSL.SP.1987.035.01.07 --- M. A. J. Williams, P. I. Abell, and B. W. Sparks: Quaternary landforms, sediments, depositional environments and gastropod isotope ratios at Adrar Bous, Tenere Desert of Niger, south-central Sahara / Geological Society, London, Special Publications, 35:105-125, doi:10.1144/GSL.SP.1987.035.01.08 --- Aeolian Sediments: Dust Dynamics and Deposits --- W. B. Whalley, B. J. Smith, J. J. McAlister, and A. J. Edwards: Aeolian abrasion of quartz particles and the production of silt-size fragments: preliminary results / Geological Society, London, Special Publications, 35:129-138, doi:10.1144/GSL.SP.1987.035.01.09 --- K. Pye and H. Tsoar: The mechanics and geological implications of dust transport and deposition in deserts with particular reference to loess formation and dune sand diagenesis in the northern Negev, Israel / Geological Society, London, Special Publications, 35:139-156, doi:10.1144/GSL.SP.1987.035.01.10 --- R. Gerson and R. Amit: Rates and modes of dust accretion and deposition in an arid region—the Negev, Israel / Geological Society, London, Special Publications, 35:157-169, doi:10.1144/GSL.SP.1987.035.01.11 --- H. Vine: Wind-blown materials and W African soils: an explanation of the ‘ferrallitic soil over loose sandy sediments’ profile / Geological Society, London, Special Publications, 35:171-183, doi:10.1144/GSL.SP.1987.035.01.12 --- Dune Dynamics and Deposits --- A. Gunatilaka and S. Mwango: Continental sabkha pans and associated nebkhas in southern Kuwait, Arabian Gulf / Geological Society, London, Special Publications, 35:187-203, doi:10.1144/GSL.SP.1987.035.01.13 --- A. Warren and S. Kay: Dune networks / Geological Society, London, Special Publications, 35:205-212, doi:10.1144/GSL.SP.1987.035.01.14 --- L. B. Clemmensen: Complex star dunes and associated aeolian bedforms, Hopeman Sandstone (Permo-Triassic), Moray Firth Basin, Scotland / Geological Society, London, Special Publications, 35:213-231, doi:10.1144/GSL.SP.1987.035.01.15 --- B. P. J. Williams, E. K. Wild, and R. J. Suttill: Late Palaeozoic cold-climate aeolianites, southern Cooper Basin, South Australia / Geological Society, London, Special Publications, 35:233-249, doi:10.1144/GSL.SP.1987.035.01.16 --- R. A. Carruthers: Aeolian sedimentation from the Galtymore Formation (Devonian), Ireland / Geological Society, London, Special Publications, 35:251-268, doi:10.1144/GSL.SP.1987.035.01.17 --- Grain Size, Process and Dune Environment --- E. C. Flenley, N. R. J. Fieller, and D. D. Gilbertson: The statistical analysis of ‘mixed’ grain size distributions from aeolian sands in the Libyan Pre-Desert using log skew Laplace models / Geological Society, London, Special Publications, 35:271-280, doi:10.1144/GSL.SP.1987.035.01.18 --- I. Livingstone: Grain-size variation on a ‘complex’ linear dune in the Namib Desert / Geological Society, London, Special Publications, 35:281-291, doi:10.1144/GSL.SP.1987.035.01.19 --- D. S. G. Thomas: Discrimination of depositional environments using sedimentary characteristics in the Mega Kalahari, central southern Africa / Geological Society, London, Special Publications, 35:293-306, doi:10.1144/GSL.SP.1987.035.01.20 --- Chemical Sediments --- D. A. Hendry: Silica and calcium carbonate replacement of plant roots in tropical dune sands, SE India / Geological Society, London, Special Publications, 35:309-319, doi:10.1144/GSL.SP.1987.035.01.21 --- C. R. Roberts and C. W. Mitchell: Spring mounds in southern Tunisia / Geological Society, London, Special Publications, 35:321-334, doi:10.1144/GSL.SP.1987.035.01.22 --- Remote Sensing of Desert Sediments --- C. S. Breed, J. F. McCauley, and P. A. Davis: Sand sheets of the eastern Sahara and ripple blankets on Mars / Geological Society, London, Special Publications, 35:337-359, doi:10.1144/GSL.SP.1987.035.01.23 --- M. M. Ashour: Surficial deposits of Qatar Peninsula / Geological Society, London, Special Publications, 35:361-367, doi:10.1144/GSL.SP.1987.035.01.24 --- A. C. Millington, A. R. Jones, N. Quarmby, and J. R. G. Townshend: Remote sensing of sediment transfer processes in playa basins / Geological Society, London, Special Publications, 35:369-381, doi:10.1144/GSL.SP.1987.035.01.25
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  • 3
    Monograph available for loan
    Monograph available for loan
    Oxford [u.a.] : Blackwell
    Associated volumes
    Call number: 9/M 93.0659 ; 9/M 92.0431
    In: Geological Society special publication
    Description / Table of Contents: In recognition of the increasing interest in the subject of deformation of sediments and sedimentary rocks shown by Earth scientists in recent years, a major international conference with this theme was held at University College London in April 1985. This volume contains the texts of those contributions to the Conference that were submitted for publication. The collection of papers presented is not a complete record of the proceedings, as some contributors chose not to submit a manuscript. However, most important subject areas are represented, and the papers provide both a review of the present state of the art and pointers for future investigation. The articles have been grouped into three main divisions: experimental and theoretical, process orientated, and descriptive of particular areas or localities. Within those groupings there is no particular significance in the order of printing except that articles with aspects in common have been placed near to one another. Studies of naturally deformed sedimentary rocks repeatedly indicate that much of the observed deformation resulted from processes active before the rock was lithified. An understanding of the origins of these structures cannot be established using the principles of rock mechanics and crystal physics commonly employed in ‘hard-rock’ structural geology (Rutter 1976; White 1976), the principles of the engineering discipline of soil mechanics being more appropriate. Alternatively, the post-lithification deformation of sediments is a typical rock mechanics problem and may involve an understanding of elasticity (Jaeger & Cook 1969), fracturing (Price 1966; Barton 1976), crystal plasticity (Turcotte & Schubert 1982) and diffusion based deformation mechanisms (Rutter 1976, 1983). The student of sediment deformation must therefore be conversant with all aspects of rock and soil deformation. The Conference, with its contributions by structural geologists, sedimentologists, geotechnical engineers and those conversant with specific aspects of rock and soil mechanics, provided a coverage of this very wide subject area. This is reflected in the contents of the volume.
    Type of Medium: Monograph available for loan
    Pages: VII, 350 S. , Ill., graph. Darst., Kt.
    ISBN: 0632017333
    Series Statement: Geological Society special publication 29
    Classification:
    Tectonics
    Language: English
    Note: Mervyn E. Jones and R. M. F. Preston: Introduction / Geological Society, London, Special Publications, 29:1-8, doi:10.1144/GSL.SP.1987.029.01.01 --- Part I: Theory and Experimental --- G. Owen: Deformation processes in unconsolidated sands / Geological Society, London, Special Publications, 29:11-24, doi:10.1144/GSL.SP.1987.029.01.02 --- J. P. Gratier: Pressure solution-deposition creep and associated tectonic differentiation in sedimentary rocks / Geological Society, London, Special Publications, 29:25-38, doi:10.1144/GSL.SP.1987.029.01.03 --- G. Mandl and R. M. Harkness: Hydrocarbon migration by hydraulic fracturing / Geological Society, London, Special Publications, 29:39-53, doi:10.1144/GSL.SP.1987.029.01.04 --- C. R. I. Clayton and M. C. Matthews: Deformation, diagenesis and the mechanical behaviour of chalk / Geological Society, London, Special Publications, 29:55-62, doi:10.1144/GSL.SP.1987.029.01.05 --- R. J. Allison: Non-destructive determination of Young’s modulus and its relationship with compressive strength, porosity and density / Geological Society, London, Special Publications, 29:63-69, doi:10.1144/GSL.SP.1987.029.01.06 --- Alex J. Maltman: A laboratory technique for investigating the deformation microstructures of water-rich sediments / Geological Society, London, Special Publications, 29:71-76, doi:10.1144/GSL.SP.1987.029.01.07 --- Alex. J. Maltman: Shear zones in argillaceous sediments—an experimental study / Geological Society, London, Special Publications, 29:77-87, doi:10.1144/GSL.SP.1987.029.01.08 --- Part II: Processes --- John R. Underhill and Nigel H. Woodcock: Faulting mechanisms in high-porosity sandstones; New Red Sandstone, Arran, Scotland / Geological Society, London, Special Publications, 29:91-105, doi:10.1144/GSL.SP.1987.029.01.09 --- Jean-Pierre Petit and Edgard Laville: Morphology and microstructures of hydroplastic slickensides in sandstone / Geological Society, London, Special Publications, 29:107-121, doi:10.1144/GSL.SP.1987.029.01.10 --- Michel Guiraud and Michel Séguret: Soft-sediment microfaulting related to compaction within the fluviodeltaic infill of the Soria strike-slip basin (northern Spain) / Geological Society, London, Special Publications, 29:123-136, doi:10.1144/GSL.SP.1987.029.01.11 --- Michael Leeder: Sediment deformation structures and the palaeotectonic analysis of sedimentary basins, with a case-study from the Carboniferous of northern England / Geological Society, London, Special Publications, 29:137-144, NP, 145-146, doi:10.1144/GSL.SP.1987.029.01.12 --- Pierre Labaume: Syn-diagenetic deformation of a turbiditic succession related to submarine gravity nappe emplacement, Autapie Nappe, French Alps / Geological Society, London, Special Publications, 29:147-163, doi:10.1144/GSL.SP.1987.029.01.13 --- S.A. Schack Pedersen: Comparative studies of gravity tectonics in Quaternary sediments and sedimentary rocks related to fold belts / Geological Society, London, Special Publications, 29:165-179, doi:10.1144/GSL.SP.1987.029.01.14 --- S. G. Farrell and S. Eaton: Slump strain in the Tertiary of Cyprus and the Spanish Pyrenees. Definition of palaeoslopes and models of soft-sediment deformation / Geological Society, London, Special Publications, 29:181-196, doi:10.1144/GSL.SP.1987.029.01.15 --- P. M. Clifford, M. C. Rice, L. L. Pryer, and F. Fueten: Mass transfer in unmetamorphosed carbonates and during low-grade metamorphism of arenites / Geological Society, London, Special Publications, 29:197-209, doi:10.1144/GSL.SP.1987.029.01.16 --- Part III: Descriptive --- K. T. Pickering: Wet-sediment deformation in the Upper Ordovician Point Leamington Formation: an active thrust-imbricate system during sedimentation, Notre Dame Bay, north-central Newfoundland / Geological Society, London, Special Publications, 29:213-218,NP,219-232,NP,234-239, doi:10.1144/GSL.SP.1987.029.01.17 --- Krzysztof Brodzikowski, Roman Gotowała, Ludwik Kasza, and Antonius J. Van Loon: The Kleszczów Graben (central Poland): reconstruction of the deformational history and inventory of the resulting soft-sediment deformational structures / Geological Society, London, Special Publications, 29:241-254, doi:10.1144/GSL.SP.1987.029.01.18 --- K. Brodzikowski, R. Gotowała, A. Hałuszczak, D. Krzyszkowski, and A. J. Van Loon: Soft-sediment deformations from glaciodeltaic, glaciolacustrine and fluviolacustrine sediments in the Kleszczów Graben (central Poland) / Geological Society, London, Special Publications, 29:255-267, doi:10.1144/GSL.SP.1987.029.01.19 --- Krzysztof Brodzikowski, Dariusz Krzyszkowski, and Antonius J. Van Loon: Endogenic processes as a cause of penecontemporaneous soft-sediment deformations in the fluviolacustrine Czyżów Series (Kleszczów Graben, central Poland) / Geological Society, London, Special Publications, 29:269-278, doi:10.1144/GSL.SP.1987.029.01.20 --- Krzysztof Brodzikowski and Andrzej Hałuszczak: Flame structures and associated deformations in Quaternary glaciolacustrine and glaciodeltaic deposits: examples from central Poland / Geological Society, London, Special Publications, 29:279-286, doi:10.1144/GSL.SP.1987.029.01.21 --- Krzysztof Brodzikowski, Andrzej Hałuszczak, Dariusz Krzyszkowski, and Antonius J. Van Loon: Genesis and diagnostic value of large-scale gravity-induced penecontemporaneous deformation horizons in Quaternary sediments of the Kleszczów Graben (central Poland) / Geological Society, London, Special Publications, 29:287-298, doi:10.1144/GSL.SP.1987.029.01.22 --- Colin A. Davenport and Philip S. Ringrose: Deformation of Scottish Quaternary sediment sequences by strong earthquake motions / Geological Society, London, Special Publications, 29:299-314, doi:10.1144/GSL.SP.1987.029.01.23 --- J. Alexander: Syn-sedimentary and burial related deformation in the Middle Jurassic non-marine formations of the Yorkshire Basin / Geological Society, London, Special Publications, 29:315-324, doi:10.1144/GSL.SP.1987.029.01.24 --- Bill Fitches: Aspects of veining in the Welsh Lower Palaeozoic Basin / Geological Society, London, Special Publications, 29:325-342, doi:10.1144/GSL.SP.1987.029.01.25
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  • 4
    Unknown
    Oxford [u.a.] : Blackwell
    Associated volumes
    Call number: 14740
    In: Optical mineralogie
    Pages: 158 S.
    ISBN: 0865423237
    Language: English
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  • 5
    Monograph available for loan
    Monograph available for loan
    Oxford [u.a.] : Blackwell
    Associated volumes
    Call number: 9/M 92.1245 ; M 93.0059/33
    In: Geological Society special publication
    Type of Medium: Monograph available for loan
    Pages: X, 575 S. , Ill., zahlr. graph. Darst., Kt.
    ISBN: 0632018062
    Series Statement: Geological Society special publication 33
    Classification:
    Petrology, Petrography
    Language: English
    Note: General Topics and Reviews --- S. R. Taylor: Geochemical and Petrological Significance of the Archaean-Proterozoic Boundary / Geological Society, London, Special Publications, 33:3-8, doi:10.1144/GSL.SP.1987.033.01.01 --- R. P. Hall, D. J. Hughes, C. R. L. Friend, and G. L. Snyder: Proterozoic Mantle Heterogeneity: Geochemical Evidence from Contrasting Basic Dykes / Geological Society, London, Special Publications, 33:9-21, doi:10.1144/GSL.SP.1987.033.01.02 --- D. Rickard: Proterozoic Volcanogenic Mineralization Styles / Geological Society, London, Special Publications, 33:23-35, doi:10.1144/GSL.SP.1987.033.01.03 --- Early Proterozoic Volcanic Suites of the Baltic Shield --- T. C. Pharaoh, A. Warren, and N. J. Walsh: Early Proterozoic Metavolcanic Suites of the Northernmost Part of the Baltic Shield / Geological Society, London, Special Publications, 33:41-58, doi:10.1144/GSL.SP.1987.033.01.04 --- M. Honkamo: Geochemistry and Tectonic Setting of Early Proterozoic Volcanic Rocks in Northern Ostrobothnia, Finland / Geological Society, London, Special Publications, 33:59-68, doi:10.1144/GSL.SP.1987.033.01.05 --- Waldo Vivallo and Lars-Åke Claesson: Intra-Arc Rifting and Massive Sulphide Mineralization in an Early Proterozoic Volcanic Arc, Skellefte District, Northern Sweden / Geological Society, London, Special Publications, 33:69-79, doi:10.1144/GSL.SP.1987.033.01.06 --- Joanna Parr and David Rickard: Early Proterozoic Subaerial Volcanism and Its Relationship to Broken Hill-type Mineralization in Central Sweden / Geological Society, London, Special Publications, 33:81-93, doi:10.1144/GSL.SP.1987.033.01.07 --- H. Colley and L. Westra: The Volcano-Tectonic Setting and Mineralization of the Early Proterozoic Kemiö-Orijärvi-Lohja Belt, SW Finland / Geological Society, London, Special Publications, 33:95-107, doi:10.1144/GSL.SP.1987.033.01.08 --- Early and Middle Proterozoic Volcanic Suites of the Laurentian and North Atlantic Shields --- W. R. A. Baragar and R. F. J. Scoates: Volcanic Geochemistry of the Northern Segments of the Circum-Superior Belt of the Canadian Shield / Geological Society, London, Special Publications, 33:113-131, doi:10.1144/GSL.SP.1987.033.01.09 --- N. T. Arndt, G. E. Brügmann, K. Lehnert, C. Chauvel, and B. W. Chappell: Geochemistry, Petrogenesis and Tectonic Environment of Circum-Superior Belt Basalts, Canada / Geological Society, London, Special Publications, 33:133-145, doi:10.1144/GSL.SP.1987.033.01.10 --- J. F. Lewry, R. MacDonald, C. Livesey, M. Meyer, R. Van Schmus, and M. E. Bickford: U-Pb Geochronology of Accreted Terranes in the Trans-Hudson Orogen, Northern Saskatchewan, Canada / Geological Society, London, Special Publications, 33:147-166, doi:10.1144/GSL.SP.1987.033.01.11 --- B. R. Watters and J. A. Pearce: Metavolcanic Rocks of the La Ronge Domain in the Churchill Province, Saskatchewan: Geochemical Evidence for a Volcanic Arc Origin / Geological Society, London, Special Publications, 33:167-182, doi:10.1144/GSL.SP.1987.033.01.12 --- J. W. Gaskarth and G. R. Parslow: Proterozoic Volcanism in the Flin Flon Greenstone Belt, East-Central Saskatchewan, Canada / Geological Society, London, Special Publications, 33:183-200, doi:10.1144/GSL.SP.1987.033.01.13 --- Charles F. Gower and Bruce Ryan: Two Stage Felsic Volcanism in the Lower Proterozoic Upper Aillik Group, Labrador, Canada: Its Relationship to Syn- and Post-Kinematic Plutonism / Geological Society, London, Special Publications, 33:201-210, doi:10.1144/GSL.SP.1987.033.01.14 --- K. C. Condie: Early Proterozoic Volcanic Regimes in Southwestern North America / Geological Society, London, Special Publications, 33:211-218, doi:10.1144/GSL.SP.1987.033.01.15 --- A. N. LeCheminant, A. R. Miller, and G. M. LeCheminant: Early Proterozoic Alkaline Igneous Rocks, District of Keewatin, Canada: Petrogenesis and Mineralization / Geological Society, London, Special Publications, 33:219-240, doi:10.1144/GSL.SP.1987.033.01.16 --- A. B. Ryan, W. R. A. Baragar, and D. J. Kontak: Geochemistry, Tectonic Setting, and Mineralization of High-Potassium Middle Proterozoic Rocks in Central Labrador, Canada / Geological Society, London, Special Publications, 33:241-254, doi:10.1144/GSL.SP.1987.033.01.17 --- Y. A. Johnson, R. G. Park, and J. A. Winchester: Geochemistry, Petrogenesis and Tectonic Significance of the Early Proterozoic Loch Maree Group Amphibolites of the Lewisian Complex, NW Scotland / Geological Society, London, Special Publications, 33:255-269, doi:10.1144/GSL.SP.1987.033.01.18 --- Proterozoic Volcanic Suites of the Guiana Shield --- A. K. Gibbs: Proterozoic Volcanic Rocks of the Northern Guiana Shield, South America / Geological Society, London, Special Publications, 33:275-288, doi:10.1144/GSL.SP.1987.033.01.19 --- R. Renner and A. K. Gibbs: Geochemistry and Petrology of Metavolcanic Rocks of the Early Proterozoic Mazaruni Greenstone Belt, Northern Guyana / Geological Society, London, Special Publications, 33:289-309, doi:10.1144/GSL.SP.1987.033.01.20 --- Proterozoic Volcanic Suites of Africa --- R. E. Myers, R. G. Cawthorn, T. S. McCarthy, and C. R. Anhaeusser: Fundamental Uniformity in the Trace Element Patterns of the Volcanics of the Kaapvaal Craton from 3000 to 2100 Ma: Evidence for the Lithospheric Origin of These Continental Tholeiites / Geological Society, London, Special Publications, 33:315-325, doi:10.1144/GSL.SP.1987.033.01.21 --- D. L. Reid, A. J. Erlank, H. J. Welke, and A. Moyes: The Orange River Group: a Major Proterozoic Calcalkaline Volcanic Belt in the Western Namaqua Province, Southern Africa / Geological Society, London, Special Publications, 33:327-346, doi:10.1144/GSL.SP.1987.033.01.22 --- G. Borg and K. J. Maiden: Alteration of Late Middle Proterozoic Volcanics and its Relation to Stratabound Copper-Silver-Gold Mineralization Along the Margin of the Kalahari Craton in Swa/Namibia and Botswana / Geological Society, London, Special Publications, 33:347-354, doi:10.1144/GSL.SP.1987.033.01.23 --- J. H. Breitkopf and K. J. Maiden: Geochemical Patterns of Metabasites in the Southern Part of the Damara Orogen, SWA/Namibia: Applicability to the Recognition of Tectonic Environment / Geological Society, London, Special Publications, 33:355-361, doi:10.1144/GSL.SP.1987.033.01.24 --- P. M. Klemenic: The Geochemistry of Upper Proterozoic Lavas From the Red Sea Hills, NE Sudan / Geological Society, London, Special Publications, 33:363-372, doi:10.1144/GSL.SP.1987.033.01.25 --- Proterozoic Volcanic Suites of Australia --- L. A. I. Wyborn, R. W. Page, and A. J. Parker: Geochemical and Geochronological Signatures in Australian Proterozoic Igneous Rocks / Geological Society, London, Special Publications, 33:377-394, doi:10.1144/GSL.SP.1987.033.01.26 --- S. D. James, J. A. Pearce, and R. A. Oliver: The Geochemistry of the Lower Proterozoic Willyama Complex Volcanics, Broken Hill Block, New South Wales / Geological Society, London, Special Publications, 33:395-408, doi:10.1144/GSL.SP.1987.033.01.27 --- I. H. Wilson: Geochemistry of Proterozoic Volcanics, Mount Isa Inlier, Australia / Geological Society, London, Special Publications, 33:409-423, doi:10.1144/GSL.SP.1987.033.01.28 --- L. A. I. Wyborn: The Petrology and Geochemistry of Alteration Assemblages in the Eastern Creek Volcanics, as a Guide to Copper and Uranium Mobility Associated with Regional Metamorphism and Deformation, Mount Isa, Queensland / Geological Society, London, Special Publications, 33:425-434, doi:10.1144/GSL.SP.1987.033.01.29 --- Proterozoic Volcanic Suites of Asia --- Jia Chengzao: Geochemistry and Tectonics of the Xionger Group in the Eastern Qinling Mountains of China—a mid Proterozoic Volcanic arc Related to Plate Subduction / Geological Society, London, Special Publications, 33:436-448, doi:10.1144/GSL.SP.1987.033.01.30 --- Middle to Late Proterozoic Volcanic Suites of the North Atlantic Borderlands --- T. E. Smith and P. E. Holm: The Trace Element Geochemist
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  • 6
    Call number: 9/M 92.0582
    In: Geological Society special publication
    Type of Medium: Monograph available for loan
    Pages: XII, 637 S. , Ill., graph. Darst., Kt.
    ISBN: 0632016051
    Series Statement: Geological Society special publication 28
    Classification:
    Tectonics
    Language: English
    Note: Paul Hancock: Appreciation: A. M. Quennell—a prescient tectonician / Geological Society, London, Special Publications, 28:x-xii, doi:10.1144/GSL.SP.1987.028.01.01 --- Fault Geometry and Associated Processes --- J. A. Jackson: Active normal faulting and crustal extension / Geological Society, London, Special Publications, 28:3-17, doi:10.1144/GSL.SP.1987.028.01.02 --- A. Gibbs: Development of extension and mixed-mode sedimentary basins / Geological Society, London, Special Publications, 28:19-33, doi:10.1144/GSL.SP.1987.028.01.03 --- N. J. Kusznir and R. G. Park: The extensional strength of the continental lithosphere: its dependence on geothermal gradient, and crustal composition and thickness / Geological Society, London, Special Publications, 28:35-52, doi:10.1144/GSL.SP.1987.028.01.04 --- H. David Lynch and Paul Morgan: The tensile strength of the lithosphere and the localization of extension / Geological Society, London, Special Publications, 28:53-65, doi:10.1144/GSL.SP.1987.028.01.05 --- C. E. Keen: Some important consequences of lithospheric extension / Geological Society, London, Special Publications, 28:67-73, doi:10.1144/GSL.SP.1987.028.01.06 --- David Barr: Lithospheric stretching, detached normal faulting and footwall uplift / Geological Society, London, Special Publications, 28:75-94, doi:10.1144/GSL.SP.1987.028.01.07 --- B. Vendeville, P. R. Cobbold, P. Davy, P. Choukroune, and J. P. Brun: Physical models of extensional tectonics at various scales / Geological Society, London, Special Publications, 28:95-107, doi:10.1144/GSL.SP.1987.028.01.08 --- K. R. McClay and P. G. Ellis: Analogue models of extensional fault geometries / Geological Society, London, Special Publications, 28:109-125, doi:10.1144/GSL.SP.1987.028.01.09 --- P. L. Hancock and T. G. Bevan: Brittle modes of foreland extension / Geological Society, London, Special Publications, 28:127-137, doi:10.1144/GSL.SP.1987.028.01.10 --- M. R. Leeder and R. L. Gawthorpe: Sedimentary models for extensional tilt-block/half-graben basins / Geological Society, London, Special Publications, 28:139-152, doi:10.1144/GSL.SP.1987.028.01.11 --- Extension in the Basin and Range Province and East Pacific Margin --- W. Hamilton: Crustal extension in the Basin and Range Province, southwestern United States / Geological Society, London, Special Publications, 28:155-176, doi:10.1144/GSL.SP.1987.028.01.12 --- P. J. Coney: The regional tectonic setting and possible causes of Cenozoic extension in the North American Cordillera / Geological Society, London, Special Publications, 28:177-186, doi:10.1144/GSL.SP.1987.028.01.13 --- L. J. Sonder, P. C. England, B. P. Wernicke, and R. L. Christiansen: A physical model for Cenozoic extension of western North America / Geological Society, London, Special Publications, 28:187-201, doi:10.1144/GSL.SP.1987.028.01.14 --- Brian P. Wernicke, Philip C. England, Leslie J. Sonder, and Robert L. Christiansen: Tectonomagmatic evolution of Cenozoic extension in the North American Cordillera / Geological Society, London, Special Publications, 28:203-221, doi:10.1144/GSL.SP.1987.028.01.15 --- Richard W. Allmendinger, Jack Oliver, Thomas A. Hauge, Ernest C. Hauser, and Christopher J. Potter: Tectonic heredity and the layered lower crust in the Basin and Range Province, western United States / Geological Society, London, Special Publications, 28:223-246, doi:10.1144/GSL.SP.1987.028.01.16 --- George H. Davis: A shear-zone model for the structural evolution of metamorphic core complexes in southeastern Arizona / Geological Society, London, Special Publications, 28:247-266, doi:10.1144/GSL.SP.1987.028.01.17 --- Jeffrey Lee, Elizabeth L. Miller, and John F. Sutter: Ductile strain and metamorphism in an extensional tectonic setting: a case study from the northern Snake Range, Nevada, USA / Geological Society, London, Special Publications, 28:267-298, doi:10.1144/GSL.SP.1987.028.01.18 --- Keith A. Howard and Barbara E. John: Crustal extension along a rooted system of imbricate low-angle faults: Colorado River extensional corridor, California and Arizona / Geological Society, London, Special Publications, 28:299-311, doi:10.1144/GSL.SP.1987.028.01.19 --- Barbara E. John: Geometry and evolution of a mid-crustal extensional fault system: Chemehuevi Mountains, southeastern California / Geological Society, London, Special Publications, 28:313-335, doi:10.1144/GSL.SP.1987.028.01.20 --- Ronald L. Bruhn, Pamela R. Gibler, and William T. Parry: Rupture characteristics of normal faults: an example from the Wasatch fault zone, Utah / Geological Society, London, Special Publications, 28:337-353, doi:10.1144/GSL.SP.1987.028.01.21 --- Gordon P. Eaton: Topography and origin of the southern Rocky Mountains and Alvarado Ridge / Geological Society, London, Special Publications, 28:355-369, doi:10.1144/GSL.SP.1987.028.01.22 --- Paul K. Eddington, Robert B. Smith, and C. Renggli: Kinematics of Basin and Range intraplate extension / Geological Society, London, Special Publications, 28:371-392, doi:10.1144/GSL.SP.1987.028.01.23 --- K. V. Hodges, J. D. Walker, and B. P. Wernicke: Footwall structural evolution of the Tucki Mountain detachment system, Death Valley region, southeastern California / Geological Society, London, Special Publications, 28:393-408, doi:10.1144/GSL.SP.1987.028.01.24 --- Bob Thompson, Eric Mercier, and Charlie Roots: Extension and its influence on Canadian Cordilleran passive-margin evolution / Geological Society, London, Special Publications, 28:409-417, doi:10.1144/GSL.SP.1987.028.01.25 --- S. W. Garrett and B. C. Storey: Lithospheric extension on the Antarctic Peninsula during Cenozoic subduction / Geological Society, London, Special Publications, 28:419-431, doi:10.1144/GSL.SP.1987.028.01.26 --- I. W. D. Dalziel, A. M. Grunow, B. C. Storey, S. W. Garrett, L. D. B. Herrod, and R. J. Pankhurst: Extensional tectonics and the fragmentation of Gondwanaland / Geological Society, London, Special Publications, 28:433-441, doi:10.1144/GSL.SP.1987.028.01.27 --- Extension in the NW European Continental Shelf --- M. J. Cheadle, S. McGeary, M. R. Warner, and D. H. Matthews: Extensional structures on the western UK continental shelf: a review of evidence from deep seismic profiling / Geological Society, London, Special Publications, 28:445-465, doi:10.1144/GSL.SP.1987.028.01.28 --- Alastair Beach, Tim Bird, and Alan Gibbs: Extensional tectonics and crustal structure: deep seismic reflection data from the northern North Sea Viking graben / Geological Society, London, Special Publications, 28:467-476, doi:10.1144/GSL.SP.1987.028.01.29 --- F. Zervos: A compilation and regional interpretation of the northern North Sea gravity map / Geological Society, London, Special Publications, 28:477-493, doi:10.1144/GSL.SP.1987.028.01.30 --- Stephen E. Laubach and Stephen Marshak: Fault patterns generated during extensional deformation of crystalline basement, NW Scotland / Geological Society, London, Special Publications, 28:495-499, doi:10.1144/GSL.SP.1987.028.01.31 --- S. R. Kirton and K. Hitchen: Timing and style of crustal extension N of the Scottish mainland / Geological Society, London, Special Publications, 28:501-510, doi:10.1144/GSL.SP.1987.028.01.32 --- C. R. Fielding and G. A. L. Johnson: Sedimentary structures associated with extensional fault movement from the Westphalian of NE England / Geological Society, London, Special Publications, 28:511-516, doi:10.1144/GSL.SP.1987.028.01.33 --- Garry D. Karner, Stuart D. Lake, and John F. Dewey: The thermal and mechanical development of the Wessex Basin, southern England / Geological Society, London, Special Publications, 28:517-536, doi:10.1144/GSL.SP.1987.028.01.34 --- Michel Seranne and Michel Seguret: The Devonian basins of western Norway: tectonics and kinematics of an extending crust / Geological Society, London, Special Publications, 28:537-548, doi:10.1144/GSL.SP.1987.028.01.35 --- Extension in the Middle Eas
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  • 7
    Monograph available for loan
    Monograph available for loan
    Oxford [u.a.] : Blackwell
    Associated volumes
    Call number: 9/M 92.1248
    In: Geological Society special publication
    Description / Table of Contents: Alkaline igneous rocks may be defined as those which have higher concentrations of alkalis than can be accommodated in feldspars alone, the excess appearing as feldspathoids, sodic pyroxenes, sodic amphiboles and other alkali-rich phases. These rocks are, therefore, deficient in silica and/or alumina with respect to alkalis and will have nepheline and/or acmite in their norms. In practice the term ‘alkaline’ is used to encompass a wide range of igneous rocks, not all of which conform to this rigid definition. Carbonatites, for example, are certainly silica-deficient but are rarely alkali-rich. True (nepheline-normative) alkali basalts grade into hypersthene-normative transitional basalts without any obvious change in mineralogy. Since transitional basalts are often closely associated with alkali basalts in the field, they are traditionally regarded as alkaline. It is now usual practice to define alkaline igneous rocks simply in terms of their alkali (Na2O + K2O) and silica contents (see, for example, Le Bas et al. 1986). We have not attempted to review the classification of alkaline igneous rocks in this volume as this has been dealt with elsewhere (e.g. Sørensen 1974; Streckeisen 1967, 1980). The only alkaline rocks not covered in previous reviews are those hydrous mafic to ultramafic hypabyssal rocks known as the lamprophyres. The present volume includes three papers on this group. A comprehensive overview of lamprophyres is given by Rock and of the sub-group of lamproites by Bergman. The relationship between lamproites and kimberlites (which arguably belong to the lamprophyres) is discussed by Dawson.
    Type of Medium: Monograph available for loan
    Pages: XIV, 568 S. , Ill., graph. Darst., Kt.
    ISBN: 0632016167
    Series Statement: Geological Society special publication 30
    Classification:
    Petrology, Petrography
    Language: English
    Note: J. G. Fitton and B. G. J. Upton: Introduction / Geological Society, London, Special Publications, 30:ix-xiv, doi:10.1144/GSL.SP.1987.030.01.01 --- D. K. Bailey: Mantle metasomatism—perspective and prospect / Geological Society, London, Special Publications, 30:1-13, doi:10.1144/GSL.SP.1987.030.01.02 --- Martin Menzies: Alkaline rocks and their inclusions: a window on the Earth’s interior / Geological Society, London, Special Publications, 30:15-27, doi:10.1144/GSL.SP.1987.030.01.03 --- A. D. Edgar: The genesis of alkaline magmas with emphasis on their source regions: inferences from experimental studies / Geological Society, London, Special Publications, 30:29-52, doi:10.1144/GSL.SP.1987.030.01.04 --- M. J. Le Bas: Nephelinites and carbonatites / Geological Society, London, Special Publications, 30:53-83, doi:10.1144/GSL.SP.1987.030.01.05 --- James D. Twyman and John Gittins: Alkalic carbonatite magmas: parental or derivative? / Geological Society, London, Special Publications, 30:85-94, doi:10.1144/GSL.SP.1987.030.01.06 --- J. B. Dawson: The kimberlite clan: relationship with olivine and leucite lamproites, and inferences for upper-mantle metasomatism / Geological Society, London, Special Publications, 30:95-101, doi:10.1144/GSL.SP.1987.030.01.07 --- Steven C. Bergman: Lamproites and other potassium-rich igneous rocks: a review of their occurrence, mineralogy and geochemistry / Geological Society, London, Special Publications, 30:103-190, doi:10.1144/GSL.SP.1987.030.01.08 --- Nicholas M.S. Rock: The nature and origin of lamprophyres: an overview / Geological Society, London, Special Publications, 30:191-226, doi:10.1144/GSL.SP.1987.030.01.09 --- David A. Clague: Hawaiian alkaline volcanism / Geological Society, London, Special Publications, 30:227-252, doi:10.1144/GSL.SP.1987.030.01.10 --- Barry L. Weaver, David A. Wood, John Tarney, and Jean Louis Joron: Geochemistry of ocean island basalts from the South Atlantic: Ascension, Bouvet, St. Helena, Gough and Tristan da Cunha / Geological Society, London, Special Publications, 30:253-267, doi:10.1144/GSL.SP.1987.030.01.11 --- Chris Harris and Simon M.F. Sheppard: Magma and fluid evolution in the lavas and associated granite xenoliths of Ascension Island / Geological Society, London, Special Publications, 30:269-272, doi:10.1144/GSL.SP.1987.030.01.12 --- J. G. Fitton: The Cameroon line, West Africa: a comparison between oceanic and continental alkaline volcanism / Geological Society, London, Special Publications, 30:273-291, doi:10.1144/GSL.SP.1987.030.01.13 --- B.H. Baker: Outline of the petrology of the Kenya rift alkaline province / Geological Society, London, Special Publications, 30:293-311, doi:10.1144/GSL.SP.1987.030.01.14 --- R. Macdonald: Quaternary peralkaline silicic rocks and caldera volcanoes of Kenya / Geological Society, London, Special Publications, 30:313-333, doi:10.1144/GSL.SP.1987.030.01.15 --- A. R. Woolley and G. C. Jones: The petrochemistry of the northern part of the Chilwa alkaline province, Malawi / Geological Society, London, Special Publications, 30:335-355, doi:10.1144/GSL.SP.1987.030.01.16 --- P. Bowden, R. Black, R. F. Martin, E. C. Ike, J. A. Kinnaird, and R. A. Batchelor: Niger-Nigerian alkaline ring complexes: a classic example of African Phanerozoic anorogenic mid-plate magmatism / Geological Society, London, Special Publications, 30:357-379, doi:10.1144/GSL.SP.1987.030.01.17 --- J. P. Liégeois and R. Black: Alkaline magmatism subsequent to collision in the Pan-African belt of the Adrar des Iforas (Mali) / Geological Society, London, Special Publications, 30:381-401, doi:10.1144/GSL.SP.1987.030.01.18 --- C. J. N. Fletcher and B. Beddoe-Stephens: The petrology, chemistry and crystallization history of the Velasco alkaline province, eastern Bolivia / Geological Society, London, Special Publications, 30:403-413, doi:10.1144/GSL.SP.1987.030.01.19 --- Daniel S. Barker: Tertiary alkaline magmatism in Trans-Pecos Texas / Geological Society, London, Special Publications, 30:415-431, doi:10.1144/GSL.SP.1987.030.01.20 --- G. Nelson Eby: The Monteregian Hills and White Mountain alkaline igneous provinces, eastern North America / Geological Society, London, Special Publications, 30:433-447, doi:10.1144/GSL.SP.1987.030.01.21 --- B.G.J. Upton and C.H. Emeleus: Mid-Proterozoic alkaline magmatism in southern Greenland: the Gardar province / Geological Society, London, Special Publications, 30:449-471, doi:10.1144/GSL.SP.1987.030.01.22 --- Lotte Melchior Larsen and Henning Sørensen: The Ilímaussaq intrusion—progressive crystallization and formation of layering in an agpaitic magma / Geological Society, London, Special Publications, 30:473-488, doi:10.1144/GSL.SP.1987.030.01.23 --- T. F. D. Nielsen: Tertiary alkaline magmatism in East Greenland: a review / Geological Society, London, Special Publications, 30:489-515, doi:10.1144/GSL.SP.1987.030.01.24 --- Hilary Downes: Tertiary and Quaternary volcanism in the Massif Central, France / Geological Society, London, Special Publications, 30:517-530, doi:10.1144/GSL.SP.1987.030.01.25 --- L. N. Kogarko: Alkaline rocks of the eastern part of the Baltic Shield (Kola Peninsula) / Geological Society, London, Special Publications, 30:531-544, doi:10.1144/GSL.SP.1987.030.01.26
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    Description / Table of Contents: PREFACE It is to-day generally recognized by environmental scientists that the particular behaviour of trace metals in the environment is determined by their specific physico-chemical forms rather than by their total concentration. With the introduction, several years ago, of atomic absorption spectrometry at many laboratories involved in environmental studies, a technique for simple, rapid and cheap determination of total metal concentrations in environmental samples became available. As a consequence, there is a plethora of scientific papers and reports where metal concentrations in the environment are only reported as total concentrations. It appears that the simplicity of making accurate determinations of total metal contents in water, sediment and biological samples has somewhat masked the need for improved knowledge about the various forms of metals occurring in the environment as well as the bioavailahility of these forms. In other words, the need for metal speciation in studies of metals in the environment does not seem to have become obvious to most environmental scientists until relatively recently. As a matter of fact, it was only in the middle of the 1970s that the first systematic attempts were made to obtain information about the various metal species occurring in environmental samples. During the last ten years, however, a revolutionary change of attitude towards the importance of metal speciation has occurred and considerable research effort has been devoted by environmental scientists to measuring the concentrations of biologically important trace metals in surface waters. There is currently an increasing effort to couple the development of chemical analytical techniques to process-related biological problems. Concurrently, a new focus is being imposed on ecological impact studies, that of determining which active trace metal species merit the most intensive research from the standpoint of environmental perturbation. Current efforts are directed towards the development of chemical speciation schemes which can be related directly to measures of bioavailability...
    Pages: Online-Ressource (190 Seiten)
    ISBN: 9783540180715
    Language: English
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    Berlin ; Heidelberg : Springer
    Description / Table of Contents: PREFACE During the last few years, evaporites have increasingly been regarded as sediments and not only as chemical precipitates. Especially the intensive study of the Zechstein facies has resulted in a vast amount of observations and interpretations which are of general significance, offering important information to all sedimentologists interested in carbonates and evaporites. It seems therefore useful to introduce the sedimentological approach in a basin where various chemical concepts have been developed. This is the aim of the present volume, and this approach will be recognized by the reader in most of the chapters. The idea of publishing a collection of papers on the Zechstein facies and related rocks found an enthusiastic response, although later some contributors were, for various reasons, unable to meet the deadline. However, the papers submitted cover all major fields and will certainly stimulate further research...
    Pages: Online-Ressource (272 Seiten)
    ISBN: 9783540177104
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    Description / Table of Contents: PREFACE The CERN Accelerator School (CAS) was founded in 1983 with the aim to preserve and disseminate the knowledge accumulated at CERN (European Organization for Nuclear Research) and elsewhere on particle accelerators and storage rings. This is being achieved by means of a biennial programme of basic and advanced courses on general accelerator physics supplemented by specialized and topical courses as well as Workshops. The chapters included in this present volume are taken from one of the specialized courses, Applied Geodesy for Particle Accelerators, held at CERN in April 1986. When construction of the first large accelerators started in the 1950's, it was necessary to use geodetic techniques to ensure precise positioning of the machines' components. Since that time the means employed have constantly evolved in line with technological progress in general, while a number of specific developments - many of them achieved at CERN - have enriched the range of available instruments. These techniques and precision instruments are used for most of the world's accelerators but can also be applied in other areas of industrial geodesy: surveying of civil engineering works and structures, aeronautics, nautical engineering, astronomical radio-interferometers, metrology of large dimensions, studies of deformation, etc. The ever increasing dimensions of new accelerators dictates the use of the best geodetic methods in the search for the greatest precision, such as distance measurements to 10 -7, riqorous evaluation of the local geoid and millimetric exploitation of the Navstar satellites. At the same time, the powerful computer methods now available for solving difficult problems are also applicable at the instrument level where data collection can be automatically checked. Above all, measuring methods and calculations and their results can be integrated into data bases where the collection of technical parameters can be efficiently managed. In order to conserve the logical presentation of the different lectures presented at the CAS school, the chapters presented here have been grouped under four main topics. The first and the fourth deal with spatial and theoretical geodesy, while the second and third are concerned with the work of applied geodesy, especially that carried out at CERN. Readers involved in these subjects will find in the following chapters, if not the complete answer to their problems, at least the beginning of solutions to them.
    Pages: Online-Ressource (393 Seiten)
    ISBN: 9783540182191
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    Berlin ; Heidelberg : Springer
    Description / Table of Contents: Biolaminated deposits, produced by microbial communities, were studied in modern peritidal environments and in the rock record. The term microbial, mat refers to modern, the term stromatolite to ancient analogs. The term biolaminated deposits was used to encompass both microbial mats and stromatolites. Microbial mat environments studied are the Gavish Sabkha, the Solar Lake, both hypersaline back-barrier systems at the Gulf of Aqaba, Sinai Peninsula, and the "Farbstreifen-Sandwatt" (versicolored sandy tidal flats) on Mellum, an island in the estuary embayment of the southern North Sea coast. Three facies-relevant categories were distinguished: (i) the mat-forming microbiota, (2) environmental conditions controlling mat types and lithology, (3) bioturbation and grazing. Cyanobacteria account for biogenic sediment accretion in all cases studied. Three major groups occur: filamentous cyanobacteria, coccoid unicells with binary fission and those with multiple fission. In the presence of these groups the following mat types evolve: (i) continuously flat (stratiform) L~-laminae (occur in all environments studied); (2) translucent, vertically extended Lv-laminae (only Gavish Sabkha and Solar Lake); (3) nodular granules (only Gavish Sabkha). Basically, the development of mats is controlled by moisture. Thus high-lying parts where the groundwater table runs more than 40 cm below surface are bare of mats. These are: The circular slope and elevated center of the Gavish Sabkha, the shorelines of the Solar Lake and the episodically flooded upper supratidal zone of Mellum Island. The following situations of water supply were found to stimulate mat growth: (i) Capillary movement of groundwater to exposed surfaces, (2) shallowest calm water, both realized in the Gavish Sabkha and the Solar Lake. On Mellum Island, mats form in the lower supratidal zone, which is flooded in the spring tide cycle and wetted during low tide by capillary groundwater. Salinity is almost that of normal seawater, whereas in the Solar Lake, it ranges from 45 °/oo to 180 °/oo and in the Gavish Sabkha, it reaches more than 300 °/oo. Salinity increase is correlated with rising concentrations of magnesium and sulfate ions. In the Gavish Sabkha, episodic sheetfloods cause high-rate sedimentation which is accidental to the living mats. Episodic low-rate sedimentation stimulates the mats to grow through the freshly deposited sediment layer. This occurs predominantly on Mellum Island due to eolian transport. Within the Gavish Sabkha, mineralogy of sediments, community structures, standing crops, redox potentials and pH are highly correlative to the increasing evenness in moisture supply which is realized by the inclination of the system below mean sea level. These conditions bring about a lateral sequence of facies types which include (I) siliciclastic biolaminites at the coastal bar base, (2) nodular to biolaminoid carbonates at saline mud flats, (3) regularly stratified stromatolitic carbonates with ooids and oncoids within the hypersaline lagoon, (4) biolaminated sulfate towardthe elevated center. High-magnesium calcite in facies type 3 precipitates around decaying organic matter and forms also the ooids and oncoids. These occur predominantly within hydroplastic Lv-laminae which provide numerous nucleation centers. Within the Solar Lake, facies type 3 (stromatolitic carbonates with ooids and oncoids) is most important, and grows to extraordinary thickness at the lake's shelf. The regular alternation of dark and light laminae results from seasonally oscillating water depths. These conditions couple back over changing light and salinity intensities to changing dominance structures of mat-building communities. Increasing salinity correlates with decreasing water depth and accounts for the relative abundance of coccoid unicells and diatoms, both active producers of extracellular slimes (Lv-laminae). Water depths locally or temporarily increased favor surface colonization by Mic~ocoleu8 chthonoplastes (Lh-laminae). The biolaminated deposits of the versicolored tidal flats on Mellum Island are similar to facies type 1 of the Gavish Sabkha (siliciclastic biolaminites). Differences exist in the lithology: Sediments upon or through which the mats on Mellum Island grow are made up of clean sand. The grains originate predominantly from re-worked glacial sediments and are rounded to well rounded. By contrast, the strong angularity of siliciclastic grains in the Gavish Sabkha clearly shows their status as primary weathering products. In all environments studied, insects play a significant role. Mainly salt beetles contribute to the lebensspuren spectrum. There is no indication that burrowing and grazing beetles and dipterans are detrimental to the growing mat systems. According to the marine fauna, two distributional barriers exist: (i) physical and (2) biogeochemical factors. Physical barriers are (a) hypersalinity and barrier-closing, which restrict the marine fauna in the Gavish Sabkha and the Solar Lake to a few species, mainly meiofaunal elements such as ostracods and copepods. Only in the Gavish Sabkha, one marine gastropod species occurs which colonizes mud flats of lower salinity. A salinity barrier of about 70 °/oo separates the gastropod habitats from the zones of growing mats. Under reduced salinity, the snails are able to destroy the microbial mats completely. (b) Decreasing regularity of flooding in the microbial mat environment of Mellum Island excludes intertidal deformative burrowers such as cockles and lugworms. However, locally the mats are pierced by numerous dwelling traces. These stem from small polychaetes and amphipod crustaceans which are able to spread over the intertidal-supratidal boundary and settle up to the MHWS-Ievel. Biogeochemical barriers are oxygen depletion within the sediments, high ammonia and sulfide contents, which generate through bacterial break-down of organic matter. Within the highly productive mats of Mic~ocoleu8 chthonoplastes on Mellum Island, dwelling traces of marine polychaetes and amphipod crustaceans disappear due to these conditions. The name of the mat-forming species, Microcoleus chthonoplastes, indicates its capacity to form "soils" (Greek chthonos). While lithology is not altered, the presence of Mic~ocoleu8 mats leads to a habitat change which excludes trace-making "arenophile" invertebrate species and favors "chthonophile" species which do not leave traces. Stromatolitic microstructures studied in rock specimens were interpreted using modern analogs: Microcolumnar buildups in Precambrian stromatolites, ooids and oncoids were compared with those of modern microbial mats. The nodular to biolaminoid facies type found in the Gavish Sabkha was suggested to be an analog to the Plattendolomite facies of Permian Zechstein, North Poland. Studies of the Lower Jurassic ironstone of Lorraine clearly indicate that fungi have been involved in the formation of stromatolites, ooids and oncoids. In conclusion, the comparative study of microstructures in microbial mats and stromatolites reveals a better understanding in both fields. In many cases, it was geology which first revealed the similarity of recent forms to those ancient ones and consequently encouraged research into them.
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    ISBN: 9783540179375
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    Berlin ; Heidelberg : Springer
    Description / Table of Contents: INTRODUCTION Evaporites may form in a spectrum of environments from continental sabkha (playa) to deep basins (see Kendall 1978 a, b, Schreiber 1978, 1986, Friedman and Krumbein 1985, for review). In the last two decades, many ancient evaporite basins have been interpreted using the sabkha model and the deep desiccated basin model, the former not excluding the latter. However, growing evidence has been gathered indicating that most evaporites are formed in subaqueous environments, so that it cannot be reasonably expected that one depositional model alone will explain the entire basin fill. The chapters in this volume discuss characteristic examples of evaporite basins, mostly of moderate size. Aspects of a saline giant, the Zechstein basin of Central and NW Europe, have been considered in Volume 10 of "Lecture Notes in Earth Sciences"...
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    ISBN: 9783540186793
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    Berlin ; Heidelberg : Springer
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    Berlin ; Heidelberg : Springer
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