Possible hydrate mounds within large seafloor craters in the Barents Sea
Interpretation of several surveys across a ‘crater field’ in the Barents Sea provide further evidence that the craters (large depressions, 300–500 m diameter, 10–30 m deep) are related to gas escape after deglaciation some 15 000 years BP. The disposition of the craters suggests that the flow of gas...
Published in: | Geological Society, London, Special Publications |
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1998
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Online Access: | https://oceanrep.geomar.de/id/eprint/2957/ https://oceanrep.geomar.de/id/eprint/2957/1/Long%20et.al.pdf https://doi.org/10.1144/GSL.SP.1998.137.01.18 |
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ftoceanrep:oai:oceanrep.geomar.de:2957 2023-05-15T15:38:39+02:00 Possible hydrate mounds within large seafloor craters in the Barents Sea Long, D. Lammers, Stephan Linke, Peter Henriet, J.-P. Mienert, J. 1998 text https://oceanrep.geomar.de/id/eprint/2957/ https://oceanrep.geomar.de/id/eprint/2957/1/Long%20et.al.pdf https://doi.org/10.1144/GSL.SP.1998.137.01.18 en eng GSL (Geological Society London) https://oceanrep.geomar.de/id/eprint/2957/1/Long%20et.al.pdf Long, D., Lammers, S. and Linke, P. (1998) Possible hydrate mounds within large seafloor craters in the Barents Sea. In: Gas Hydrates: Relevance to World Margin Stability and Climate Change. , ed. by Henriet, J. P. and Mienert, J. Special Publications Geological Society London, 137 . GSL (Geological Society London), London, pp. 223-237. DOI 10.1144/GSL.SP.1998.137.01.18 <https://doi.org/10.1144/GSL.SP.1998.137.01.18>. doi:10.1144/GSL.SP.1998.137.01.18 info:eu-repo/semantics/restrictedAccess Book chapter NonPeerReviewed 1998 ftoceanrep https://doi.org/10.1144/GSL.SP.1998.137.01.18 2023-04-07T14:46:46Z Interpretation of several surveys across a ‘crater field’ in the Barents Sea provide further evidence that the craters (large depressions, 300–500 m diameter, 10–30 m deep) are related to gas escape after deglaciation some 15 000 years BP. The disposition of the craters suggests that the flow of gas was controlled by fractures within the Triassic siltstone bedrock. Topographic highs within several craters, comprising angular blocks of rock locally rising above the level of surrounding crater walls, are interpreted as hydrate mounds indicating that gas flow continued after the formation of the craters. This may be the first reported occurrence of hydrate mounds in lithified sediments. Assuming the gas was methane and seabed temperature was similar to that at present then the hydrate mounds were formed at a time when the sea-bed was between 280 and 340 metres below sea level (mbsl)(i.e. 10–80 m lower than at present). Geochemical studies provide evidence that gas hydrates in the sub-bottom adjacent to the crater field are presently decomposing in accordance with seasonal temperature variations. Book Part Barents Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Barents Sea Geological Society, London, Special Publications 137 1 223 237 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Interpretation of several surveys across a ‘crater field’ in the Barents Sea provide further evidence that the craters (large depressions, 300–500 m diameter, 10–30 m deep) are related to gas escape after deglaciation some 15 000 years BP. The disposition of the craters suggests that the flow of gas was controlled by fractures within the Triassic siltstone bedrock. Topographic highs within several craters, comprising angular blocks of rock locally rising above the level of surrounding crater walls, are interpreted as hydrate mounds indicating that gas flow continued after the formation of the craters. This may be the first reported occurrence of hydrate mounds in lithified sediments. Assuming the gas was methane and seabed temperature was similar to that at present then the hydrate mounds were formed at a time when the sea-bed was between 280 and 340 metres below sea level (mbsl)(i.e. 10–80 m lower than at present). Geochemical studies provide evidence that gas hydrates in the sub-bottom adjacent to the crater field are presently decomposing in accordance with seasonal temperature variations. |
author2 |
Henriet, J.-P. Mienert, J. |
format |
Book Part |
author |
Long, D. Lammers, Stephan Linke, Peter |
spellingShingle |
Long, D. Lammers, Stephan Linke, Peter Possible hydrate mounds within large seafloor craters in the Barents Sea |
author_facet |
Long, D. Lammers, Stephan Linke, Peter |
author_sort |
Long, D. |
title |
Possible hydrate mounds within large seafloor craters in the Barents Sea |
title_short |
Possible hydrate mounds within large seafloor craters in the Barents Sea |
title_full |
Possible hydrate mounds within large seafloor craters in the Barents Sea |
title_fullStr |
Possible hydrate mounds within large seafloor craters in the Barents Sea |
title_full_unstemmed |
Possible hydrate mounds within large seafloor craters in the Barents Sea |
title_sort |
possible hydrate mounds within large seafloor craters in the barents sea |
publisher |
GSL (Geological Society London) |
publishDate |
1998 |
url |
https://oceanrep.geomar.de/id/eprint/2957/ https://oceanrep.geomar.de/id/eprint/2957/1/Long%20et.al.pdf https://doi.org/10.1144/GSL.SP.1998.137.01.18 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea |
genre_facet |
Barents Sea |
op_relation |
https://oceanrep.geomar.de/id/eprint/2957/1/Long%20et.al.pdf Long, D., Lammers, S. and Linke, P. (1998) Possible hydrate mounds within large seafloor craters in the Barents Sea. In: Gas Hydrates: Relevance to World Margin Stability and Climate Change. , ed. by Henriet, J. P. and Mienert, J. Special Publications Geological Society London, 137 . GSL (Geological Society London), London, pp. 223-237. DOI 10.1144/GSL.SP.1998.137.01.18 <https://doi.org/10.1144/GSL.SP.1998.137.01.18>. doi:10.1144/GSL.SP.1998.137.01.18 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1144/GSL.SP.1998.137.01.18 |
container_title |
Geological Society, London, Special Publications |
container_volume |
137 |
container_issue |
1 |
container_start_page |
223 |
op_container_end_page |
237 |
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1766369828282564608 |