Gas Hydrate Accumulations in the Black Sea
The Black Sea has undergone several limnic and marine stages due to fluctuations in the global sea level. The exchange of saline water from the Mediterranean Sea to the Black Sea through the Bosporus Strait was interrupted when the sea level dropped below the Bosporus sill. This induced limnic condi...
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ftoceanrep:oai:oceanrep.geomar.de:54718 2023-05-15T17:12:07+02:00 Gas Hydrate Accumulations in the Black Sea Bialas, Jörg Haeckel, Matthias Mienert, J. Berndt, Christian Tréhu, A. M. Camerlenghi, A. Liu, C. S. 2022-01 text https://oceanrep.geomar.de/id/eprint/54718/ https://oceanrep.geomar.de/id/eprint/54718/1/Bialas-Gas%20Hydrate%20Accumulations%20in%20the%20Black.pdf https://doi.org/10.1007/978-3-030-81186-0_38 en eng Springer https://oceanrep.geomar.de/id/eprint/54718/1/Bialas-Gas%20Hydrate%20Accumulations%20in%20the%20Black.pdf Bialas, J. and Haeckel, M. (2022) Gas Hydrate Accumulations in the Black Sea. In: World Atlas of Submarine Gas Hydrates in Continental Margins. , ed. by Mienert, J., Berndt, C. , Tréhu, A. M., Camerlenghi, A. and Liu, C. S. Springer, Cham, pp. 451-461. DOI 10.1007/978-3-030-81186-0_38 <https://doi.org/10.1007/978-3-030-81186-0_38>. doi:10.1007/978-3-030-81186-0_38 info:eu-repo/semantics/restrictedAccess Book chapter NonPeerReviewed 2022 ftoceanrep https://doi.org/10.1007/978-3-030-81186-0_38 2023-04-07T16:00:08Z The Black Sea has undergone several limnic and marine stages due to fluctuations in the global sea level. The exchange of saline water from the Mediterranean Sea to the Black Sea through the Bosporus Strait was interrupted when the sea level dropped below the Bosporus sill. This induced limnic conditions, while marine conditions were established after the reconnection to saline Mediterranean seawater. Extended river fan systems developed during sea level low-stands, providing large amounts of organic material being buried by rapid sedimentation on the slopes of the Black Sea margins. The biogenic degradation of this material produces most of the methane gas expelled into the anoxic water column today. This largely happens by ubiquitous cold vents at ~700 m water depth (i.e. at the stability boundary of methane hydrates) and by mud volcanoes in ~2000 m water depth. A significant amount of gas is expected to accumulate in the sediment within the methane hydrate stability zone. However, bottom-simulating reflectors, the seismic indicator for gas hydrates, are not found everywhere along the margin. Recent analyses of the Danube and Dniepr fans have revealed a discontinuous gas hydrate formation in an area with no active seeps, while areas of active seepage located in the vicinity of BSR reflections held no gas hydrates. In addition, the ongoing diffusion of salt into the uppermost Black Sea sediment pore space since the last glacial maximum further reduces the volume of the gas hydrate stability zone. Estimates of the total amount of gas stored in gas hydrates therefore require a detailed structural analysis prior to regional- or basin-scale modelling attempts. Book Part Methane hydrate OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) 451 461 Cham |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
The Black Sea has undergone several limnic and marine stages due to fluctuations in the global sea level. The exchange of saline water from the Mediterranean Sea to the Black Sea through the Bosporus Strait was interrupted when the sea level dropped below the Bosporus sill. This induced limnic conditions, while marine conditions were established after the reconnection to saline Mediterranean seawater. Extended river fan systems developed during sea level low-stands, providing large amounts of organic material being buried by rapid sedimentation on the slopes of the Black Sea margins. The biogenic degradation of this material produces most of the methane gas expelled into the anoxic water column today. This largely happens by ubiquitous cold vents at ~700 m water depth (i.e. at the stability boundary of methane hydrates) and by mud volcanoes in ~2000 m water depth. A significant amount of gas is expected to accumulate in the sediment within the methane hydrate stability zone. However, bottom-simulating reflectors, the seismic indicator for gas hydrates, are not found everywhere along the margin. Recent analyses of the Danube and Dniepr fans have revealed a discontinuous gas hydrate formation in an area with no active seeps, while areas of active seepage located in the vicinity of BSR reflections held no gas hydrates. In addition, the ongoing diffusion of salt into the uppermost Black Sea sediment pore space since the last glacial maximum further reduces the volume of the gas hydrate stability zone. Estimates of the total amount of gas stored in gas hydrates therefore require a detailed structural analysis prior to regional- or basin-scale modelling attempts. |
author2 |
Mienert, J. Berndt, Christian Tréhu, A. M. Camerlenghi, A. Liu, C. S. |
format |
Book Part |
author |
Bialas, Jörg Haeckel, Matthias |
spellingShingle |
Bialas, Jörg Haeckel, Matthias Gas Hydrate Accumulations in the Black Sea |
author_facet |
Bialas, Jörg Haeckel, Matthias |
author_sort |
Bialas, Jörg |
title |
Gas Hydrate Accumulations in the Black Sea |
title_short |
Gas Hydrate Accumulations in the Black Sea |
title_full |
Gas Hydrate Accumulations in the Black Sea |
title_fullStr |
Gas Hydrate Accumulations in the Black Sea |
title_full_unstemmed |
Gas Hydrate Accumulations in the Black Sea |
title_sort |
gas hydrate accumulations in the black sea |
publisher |
Springer |
publishDate |
2022 |
url |
https://oceanrep.geomar.de/id/eprint/54718/ https://oceanrep.geomar.de/id/eprint/54718/1/Bialas-Gas%20Hydrate%20Accumulations%20in%20the%20Black.pdf https://doi.org/10.1007/978-3-030-81186-0_38 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
https://oceanrep.geomar.de/id/eprint/54718/1/Bialas-Gas%20Hydrate%20Accumulations%20in%20the%20Black.pdf Bialas, J. and Haeckel, M. (2022) Gas Hydrate Accumulations in the Black Sea. In: World Atlas of Submarine Gas Hydrates in Continental Margins. , ed. by Mienert, J., Berndt, C. , Tréhu, A. M., Camerlenghi, A. and Liu, C. S. Springer, Cham, pp. 451-461. DOI 10.1007/978-3-030-81186-0_38 <https://doi.org/10.1007/978-3-030-81186-0_38>. doi:10.1007/978-3-030-81186-0_38 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1007/978-3-030-81186-0_38 |
container_start_page |
451 |
op_container_end_page |
461 |
op_publisher_place |
Cham |
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1766068881470783488 |