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  • 1
    Keywords: Meeressediment ; Gashydrate ; Lagerstättenkunde ; Prospektion ; Abbau ; Meeresgeologie ; Klimatologie ; Natural gas ; Hydrates ; Climatic factors ; Stability ; fossile Brennstoffe ; Umweltgeologie ; Geoökologie
    Description / Table of Contents: Introduction and Overviews --- J.-P. Henriet and J. Mienert: Gas Hydrates: the Gent debates. Outlook on research horizons and strategies / Geological Society, London, Special Publications, 137:1-8, doi:10.1144/GSL.SP.1998.137.01.01 --- K. A. Kvenvolden: A primer on the geological occurrence of gas hydrate / Geological Society, London, Special Publications, 137:9-30, doi:10.1144/GSL.SP.1998.137.01.02 --- E. D. Sloan, Jr: Physical/chemical properties of gas hydrates and application to world margin stability and climatic change / Geological Society, London, Special Publications, 137:31-50, doi:10.1144/GSL.SP.1998.137.01.03 --- Analysis and Modelling of Hydrate Formation --- G. D. Ginsburg: Gas hydrate accumulation in deep-water marine sediments / Geological Society, London, Special Publications, 137:51-62, doi:10.1144/GSL.SP.1998.137.01.04 --- A. W. Rempel and B. A. Buffett: Mathematical models of gas hydrate accumulation / Geological Society, London, Special Publications, 137:63-74, doi:10.1144/GSL.SP.1998.137.01.05 --- R. J. Bakker: Improvements in clathrate modelling II: the H2O-CO2-CH4-N2-C2H6 fluid system / Geological Society, London, Special Publications, 137:75-105, doi:10.1144/GSL.SP.1998.137.01.06 --- H. Lu and R. Matsumoto: Synthesis of CO2 hydrate in various CH3CO2Na/CH3CO2H pH buffer solutions / Geological Society, London, Special Publications, 137:107-111, doi:10.1144/GSL.SP.1998.137.01.07 --- Exploration Strategy and Reservoir Evaluation Methodology --- J. S. Booth, W. J. Winters, W. P. Dillon, M. B. Clennell, and M. M. Rowe: Major occurrences and reservoir concepts of marine clathrate hydrates: implications of field evidence / Geological Society, London, Special Publications, 137:113-127, doi:10.1144/GSL.SP.1998.137.01.08 --- D. Goldberg and S. Saito: Detection of gas hydrates using downhole logs / Geological Society, London, Special Publications, 137:129-132, doi:10.1144/GSL.SP.1998.137.01.09 --- J. W. Hobro, T. A. Minshull, and S. C. Singh: Tomographic seismic studies of the methane hydrate stability zone in the Cascadia Margin / Geological Society, London, Special Publications, 137:133-140, doi:10.1144/GSL.SP.1998.137.01.10 --- U. Tinivella, E. Lodolo, A. Camerlenghi, and G. Boehm: Seismic tomography study of a bottom simulating reflector off the South Shetland Islands (Antarctica) / Geological Society, London, Special Publications, 137:141-151, doi:10.1144/GSL.SP.1998.137.01.11 --- Worldwide Gas Hydrate Occurrences and Regional Case Studies --- C. K. Paull, W. S. Borowski, and N. M. Rodriguez: Marine gas hydrate inventory: preliminary results of ODP Leg 164 and implications for gas venting and slumping associated with the Blake Ridge gas hydrate field / Geological Society, London, Special Publications, 137:153-160, doi:10.1144/GSL.SP.1998.137.01.12 --- R. Thiéry, R. Bakker, and C. Monnin: Geochemistry of gas hydrates and associated fluids in the sediments of a passive continental margin. Preliminary results of the ODP Leg 164 on the Blake Outer Ridge / Geological Society, London, Special Publications, 137:161-165, doi:10.1144/GSL.SP.1998.137.01.13 --- G. J. De Lange and H.-J. Brumsack: The occurrence of gas hydrates in Eastern Mediterranean mud dome structures as indicated by pore-water composition / Geological Society, London, Special Publications, 137:167-175, doi:10.1144/GSL.SP.1998.137.01.14 --- J. M. Woodside, M. K. Ivanov, and A. F. Limonov: Shallow gas and gas hydrates in the Anaximander Mountains region, eastern Mediterranean Sea / Geological Society, London, Special Publications, 137:177-193, doi:10.1144/GSL.SP.1998.137.01.15 --- M. K. Ivanov, A. F. Limonov, and J. M. Woodside: Extensive deep fluid flux through the sea floor on the Crimean continental margin (Black Sea) / Geological Society, London, Special Publications, 137:195-213, doi:10.1144/GSL.SP.1998.137.01.16 --- S. V. Bouriak and A. M. Akhmetjanov: Origin of gas hydrate accumulations on the continental slope of the Crimea from geophysical studies / Geological Society, London, Special Publications, 137:215-222, doi:10.1144/GSL.SP.1998.137.01.17 --- D. Long, S. Lammers, and P. Linke: Possible hydrate mounds within large sea-floor craters in the Barents Sea / Geological Society, London, Special Publications, 137:223-237, doi:10.1144/GSL.SP.1998.137.01.18 --- M. Veerayya, S. M. Karisiddaiah, K. H. Vora, B. G. Wagle, and F. Almeida: Detection of gas-charged sediments and gas hydrate horizons along the western continental margin of India / Geological Society, London, Special Publications, 137:239-253, doi:10.1144/GSL.SP.1998.137.01.19 --- S. Neben, K. Hinz, and H. Beiersdorf: Reflection characteristics, depth and geographical distribution of bottom simulating reflectors within the accretionary wedge of Sulawesi / Geological Society, London, Special Publications, 137:255-265, doi:10.1144/GSL.SP.1998.137.01.20 --- G. Delisle, H. Beiersdorf, S. Neben, and D. Steinmann: The geothermal field of the North Sulawesi accretionary wedge and a model on BSR migration in unstable depositional environments / Geological Society, London, Special Publications, 137:267-274, doi:10.1144/GSL.SP.1998.137.01.21 --- Relevance to Margin Stability and Climatic Change --- J. Mienert, J. Posewang, and M. Baumann: Gas hydrates along the northeastern Atlantic margin: possible hydrate-bound margin instabilities and possible release of methane / Geological Society, London, Special Publications, 137:275-291, doi:10.1144/GSL.SP.1998.137.01.22 --- W. P. Dillon, W. W. Danforth, D. R. Hutchinson, R. M. Drury, M. H. Taylor, and J. S. Booth: Evidence for faulting related to dissociation of gas hydrate and release of methane off the southeastern United States / Geological Society, London, Special Publications, 137:293-302, doi:10.1144/GSL.SP.1998.137.01.23 --- B. U. Haq: Natural gas hydrates: searching for the long-term climatic and slope-stability records / Geological Society, London, Special Publications, 137:303-318, doi:10.1144/GSL.SP.1998.137.01.24 --- R. B. Thorpe, J. A. Pyle, and E.G. Nisbet: What does the ice-core record imply concerning the maximum climatic impact of possible gas hydrate release at Termination 1A? / Geological Society, London, Special Publications, 137:319-326, doi:10.1144/GSL.SP.1998.137.01.25 --- D. Raynaud, J. Chappellaz, and T. Blünier: Ice-core record of atmospheric methane changes: relevance to climatic changes and possible gas hydrate sources / Geological Society, London, Special Publications, 137:327-331, doi:10.1144/GSL.SP.1998.137.01.26
    Pages: Online-Ressource (VI, 338 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 186239010x
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Earth and Planetary Science Letters 94 (1989), S. 291-300 
    ISSN: 0012-821X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Geo-marine letters 19 (1999), S. 157-163 
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  A classical bottom simulating reflector (BSR) and a presently unknown double BSR pattern are detectable in reflection seismic profiles from the Storegga Slide area west of Norway. Pressure and temperature modeling schemes lead to the assumption that the strong BSR marks the base of a hydrate stability zone with a typical methane gas composition of 99%. The upper double BSR may mark the top of gas hydrates and the lower double BSR may represent a relict of former changes of the hydrate stability field from glacial to interglacial times or the base of gas hydrates with a gas composition including heavier hydrocarbons.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2002-01-01
    Description: The presence of ice during the Late Cenozoic distinguishes the nature and rates of processes on high-latitude margins from those elsewhere. Ice sheets terminating in marine waters deliver icebergs, meltwater and debris to high-latitude seas. Sea ice influences ocean salinity structure and downslope water and sediment transfer, and also transports fine-grained sediments over long distances. These cryospheric processes have led to the development of a distinctive sedimentary architecture on modern high-latitude continental margins. Large submarine fans made up almost entirely of stacked debris flows are present around the Norwegian-Greenland Sea. Large slides are located in a variety of settings relative to rates of sediment delivery from Quaternary ice-sheet margins, but no large slides have been mapped on the East Greenland margin. However, extensive channel systems and sediment-wave fields are present in the Greenland Basin, probably related to intermittent downslope flow of dense water and turbidity currents. The extensive NE Greenland shelf was not innundated by ice-sheet advance during recent full-glacial conditions, allowing sea-ice and deep-water production during both interglacials and full-glacials. Changes in the nature and rate of sedimentation within the Greenland Basin should provide clues on the rate of dense-water production, with implications for thermohaline circulation in the North Atlantic. Other erosional and depositional features on the Norwegian-Greenland Sea margins include canyons and contourite drifts. High-relief tectonic features influence sediment reworking by turbidity currents at abyssal depths. A simple conceptual model for glacier-influenced marine sedimentation summarizes the role of cryospheric processes in high-latitude margin sedimentary environments.
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  • 5
    Publication Date: 2015-04-25
    Description: Biotic gas generation from the degradation of organic carbon in marine sediments supplies and maintains gas hydrates throughout the world’s oceans. In nascent, ultraslow-spreading ocean basins, methane generation can also be abiotic, occurring during the high-temperature (〉200 °C) serpentinization of ultramafic rocks. Here, we report on the evolution of a growing Arctic gas- and gas hydrate–charged sediment drift on oceanic crust in eastern Fram Strait, a tectonically controlled, deep-water gateway between the subpolar North Atlantic and Arctic Oceans. Ultraslow-spreading ridges between northwest Svalbard and northeast Greenland permit the sustained interaction of a mid-ocean ridge transform fault and developing sediment drift, on both young (〈10 Ma) and old (〉10 Ma) oceanic crust, since the late Miocene. Geophysical data image the gas-charged drift and crustal structure and constrain the timing of a major 30 km lateral displacement of the drift across the Molloy transform fault. We describe the buildup of a 2 m.y., long-lived gas hydrate– and free gas–charged drift system on young oceanic crust that may be fed and maintained by a dominantly abiotic methane source. Ultraslow-spreading, sedimented ridge flanks represent a previously unrecognized carbon reservoir for abiotic methane that could supply and maintain deep-water methane hydrate systems throughout the Arctic.
    Print ISSN: 0091-7613
    Electronic ISSN: 1943-2682
    Topics: Geosciences
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  • 6
    Publication Date: 2017-06-02
    Description: Widespread methane release from thawing Arctic gas hydrates is a major concern, yet the processes, sources, and fluxes involved remain unconstrained. We present geophysical data documenting a cluster of kilometer-wide craters and mounds from the Barents Sea floor associated with large-scale methane expulsion. Combined with ice sheet/gas hydrate modeling, our results indicate that during glaciation, natural gas migrated from underlying hydrocarbon reservoirs and was sequestered extensively as subglacial gas hydrates. Upon ice sheet retreat, methane from this hydrate reservoir concentrated in massive mounds before being abruptly released to form craters. We propose that these processes were likely widespread across past glaciated petroleum provinces and that they also provide an analog for the potential future destabilization of subglacial gas hydrate reservoirs beneath contemporary ice sheets.
    Keywords: Geochemistry, Geophysics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
    Publication Date: 1999-09-28
    Print ISSN: 0276-0460
    Electronic ISSN: 1432-1157
    Topics: Geosciences
    Published by Springer
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  • 8
    Publication Date: 1999-09-28
    Print ISSN: 0276-0460
    Electronic ISSN: 1432-1157
    Topics: Geosciences
    Published by Springer
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  • 9
    Publication Date: 2019-02-01
    Description: In 2014, the discovery of seafloor mounds leaking methane gas into the water column in the northwestern Barents Sea became the first to document the existence of nonpermafrost-related gas hydrate pingos (GHPs) on the Eurasian Arctic shelf. The discovered site is given attention because the gas hydrates occur close to the upper limit of the gas hydrate stability, thus may be vulnerable to climatic forcing. In addition, this site lies on the regional Hornsund Fault Zone marking a transition between the oceanic and continental crust. The Hornsund Fault Zone is known to coincide with an extensive seafloor gas seepage area; however, until now lack of seismic data prevented connecting deep structural elements to shallow seepages. Here we use high-resolution P-Cable 3-D seismic data to study the subsurface architecture of GHPs and underlying glacial and preglacial deposits. The data show gas hydrates, authigenic carbonates, and free gas within the GHPs on top of gas chimneys piercing a thin section of low-permeability glacial sediments. The chimneys connect to faults within the underlying tilted and folded fluid and gas-hydrate-bearing sedimentary rocks. Correlation of our data with regional 2-D seismic surveys shows a spatial connection between the shallow subsurface fluid flow system and the deep-seated regional fault zone. We suggest that fault-controlled Paleocene hydrocarbon reservoirs inject methane into the low-permeability glacial deposits and near-seabed sediments, forming the GHPs. This conceptual model explains the existence of climate-sensitive gas hydrate inventories and extensive seabed methane release observed along the Svalbard-Barents Sea margin. ©2019. American Geophysical Union. All Rights Reserved.
    Electronic ISSN: 1525-2027
    Topics: Chemistry and Pharmacology , Geosciences , Physics
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  • 10
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