Interactions between deep formation fluid and gas hydrate dynamics inferred from pore fluid geochemistry at active pockmarks of the Vestnesa Ridge, west Svalbard margin
Highlights • A saline formation fluid originated from great depths was documented. • Gas hydrates are currently at a dynamic equilibrium due to the low methane flux. • Fluids were diverted by the buried seep carbonates in Lunde pockmark. Abstract Seafloor seepage sites along the Vestnesa Ridge off w...
Published in: | Marine and Petroleum Geology |
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Language: | English |
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Elsevier
2021
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Online Access: | https://oceanrep.geomar.de/id/eprint/51810/ https://oceanrep.geomar.de/id/eprint/51810/10/1-s2.0-S0264817221000611-main.pdf https://oceanrep.geomar.de/id/eprint/51810/11/ScienceDirect_files_08Mar2021_08-17-52.306.zip https://doi.org/10.1016/j.marpetgeo.2021.104957 |
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ftoceanrep:oai:oceanrep.geomar.de:51810 2024-02-11T10:09:02+01:00 Interactions between deep formation fluid and gas hydrate dynamics inferred from pore fluid geochemistry at active pockmarks of the Vestnesa Ridge, west Svalbard margin Hong, W. L. Pape, T. Schmidt, Christopher Yao, H. Wallmann, Klaus J. G. Plaza-Faverola, A. Rae, J. W. B. Lepland, A. Bünz, S. Bohrmann, G. 2021-02-11 text archive https://oceanrep.geomar.de/id/eprint/51810/ https://oceanrep.geomar.de/id/eprint/51810/10/1-s2.0-S0264817221000611-main.pdf https://oceanrep.geomar.de/id/eprint/51810/11/ScienceDirect_files_08Mar2021_08-17-52.306.zip https://doi.org/10.1016/j.marpetgeo.2021.104957 en eng Elsevier https://oceanrep.geomar.de/id/eprint/51810/10/1-s2.0-S0264817221000611-main.pdf https://oceanrep.geomar.de/id/eprint/51810/11/ScienceDirect_files_08Mar2021_08-17-52.306.zip Hong, W. L., Pape, T., Schmidt, C. , Yao, H., Wallmann, K. J. G. , Plaza-Faverola, A., Rae, J. W. B., Lepland, A., Bünz, S. and Bohrmann, G. (2021) Interactions between deep formation fluid and gas hydrate dynamics inferred from pore fluid geochemistry at active pockmarks of the Vestnesa Ridge, west Svalbard margin. Open Access Marine and Petroleum Geology, 127 . Art.Nr. 104957. DOI 10.1016/j.marpetgeo.2021.104957 <https://doi.org/10.1016/j.marpetgeo.2021.104957>. doi:10.1016/j.marpetgeo.2021.104957 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2021 ftoceanrep https://doi.org/10.1016/j.marpetgeo.2021.104957 2024-01-15T00:22:57Z Highlights • A saline formation fluid originated from great depths was documented. • Gas hydrates are currently at a dynamic equilibrium due to the low methane flux. • Fluids were diverted by the buried seep carbonates in Lunde pockmark. Abstract Seafloor seepage sites along the Vestnesa Ridge off west-Svalbard have been, for decades, a natural laboratory for the studies of fluid flow and gas hydrate dynamics at passive continental margins. The lack of ground truth evidence for fluid composition and gas hydrate abundance deep in the sediment sequence however prohibits us from further assessing the current model of pockmark evolution from the region. A MARUM-MeBo 70 drilling cruise in 2016 aims to advance our understanding of the system by recovering sediments tens of meters below seafloor from two active pockmarks along Vestnesa Ridge. We report pore fluid composition data focusing on dissolved chloride, stable isotopes of water (δ18O and δD), and the isotopic composition of dissolved boron (δ11B). We detect a saline formation water around two layers where gas hydrates were recovered from one of the seepage sites. This saline formation pore fluid is characterized by elevated chloride concentrations (up to 616 mM), high B/Cl ratios (9×10-4 mol/mol), high δ18O and δD isotopic signatures (+0.6 ‰ and +3.8 ‰, respectively) and low δ11B signatures (+35.0 ‰), which collectively hint to a high temperature modification at great depths. Based on the dissolved chloride concentration profiles, we estimated up to 47 % of pore space occupied by gas hydrate in the sediments shallower than 11.5 mbsf. The observation of bubble fabric in the recovered gas hydrates suggests formation during past periods of intensive gaseous methane seepage. The presence of these gas hydrates without associated positive anomalies in dissolved chloride concentrations however suggests that the decomposition of gas hydrate is as fast as its formation. Such a state of gas hydrates can be attributed to a relatively low methane supply transported by the ... Article in Journal/Newspaper Svalbard Svalbard margin Lunde OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Svalbard Lunde ENVELOPE(50.467,50.467,-66.967,-66.967) Marine and Petroleum Geology 127 104957 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Highlights • A saline formation fluid originated from great depths was documented. • Gas hydrates are currently at a dynamic equilibrium due to the low methane flux. • Fluids were diverted by the buried seep carbonates in Lunde pockmark. Abstract Seafloor seepage sites along the Vestnesa Ridge off west-Svalbard have been, for decades, a natural laboratory for the studies of fluid flow and gas hydrate dynamics at passive continental margins. The lack of ground truth evidence for fluid composition and gas hydrate abundance deep in the sediment sequence however prohibits us from further assessing the current model of pockmark evolution from the region. A MARUM-MeBo 70 drilling cruise in 2016 aims to advance our understanding of the system by recovering sediments tens of meters below seafloor from two active pockmarks along Vestnesa Ridge. We report pore fluid composition data focusing on dissolved chloride, stable isotopes of water (δ18O and δD), and the isotopic composition of dissolved boron (δ11B). We detect a saline formation water around two layers where gas hydrates were recovered from one of the seepage sites. This saline formation pore fluid is characterized by elevated chloride concentrations (up to 616 mM), high B/Cl ratios (9×10-4 mol/mol), high δ18O and δD isotopic signatures (+0.6 ‰ and +3.8 ‰, respectively) and low δ11B signatures (+35.0 ‰), which collectively hint to a high temperature modification at great depths. Based on the dissolved chloride concentration profiles, we estimated up to 47 % of pore space occupied by gas hydrate in the sediments shallower than 11.5 mbsf. The observation of bubble fabric in the recovered gas hydrates suggests formation during past periods of intensive gaseous methane seepage. The presence of these gas hydrates without associated positive anomalies in dissolved chloride concentrations however suggests that the decomposition of gas hydrate is as fast as its formation. Such a state of gas hydrates can be attributed to a relatively low methane supply transported by the ... |
format |
Article in Journal/Newspaper |
author |
Hong, W. L. Pape, T. Schmidt, Christopher Yao, H. Wallmann, Klaus J. G. Plaza-Faverola, A. Rae, J. W. B. Lepland, A. Bünz, S. Bohrmann, G. |
spellingShingle |
Hong, W. L. Pape, T. Schmidt, Christopher Yao, H. Wallmann, Klaus J. G. Plaza-Faverola, A. Rae, J. W. B. Lepland, A. Bünz, S. Bohrmann, G. Interactions between deep formation fluid and gas hydrate dynamics inferred from pore fluid geochemistry at active pockmarks of the Vestnesa Ridge, west Svalbard margin |
author_facet |
Hong, W. L. Pape, T. Schmidt, Christopher Yao, H. Wallmann, Klaus J. G. Plaza-Faverola, A. Rae, J. W. B. Lepland, A. Bünz, S. Bohrmann, G. |
author_sort |
Hong, W. L. |
title |
Interactions between deep formation fluid and gas hydrate dynamics inferred from pore fluid geochemistry at active pockmarks of the Vestnesa Ridge, west Svalbard margin |
title_short |
Interactions between deep formation fluid and gas hydrate dynamics inferred from pore fluid geochemistry at active pockmarks of the Vestnesa Ridge, west Svalbard margin |
title_full |
Interactions between deep formation fluid and gas hydrate dynamics inferred from pore fluid geochemistry at active pockmarks of the Vestnesa Ridge, west Svalbard margin |
title_fullStr |
Interactions between deep formation fluid and gas hydrate dynamics inferred from pore fluid geochemistry at active pockmarks of the Vestnesa Ridge, west Svalbard margin |
title_full_unstemmed |
Interactions between deep formation fluid and gas hydrate dynamics inferred from pore fluid geochemistry at active pockmarks of the Vestnesa Ridge, west Svalbard margin |
title_sort |
interactions between deep formation fluid and gas hydrate dynamics inferred from pore fluid geochemistry at active pockmarks of the vestnesa ridge, west svalbard margin |
publisher |
Elsevier |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/51810/ https://oceanrep.geomar.de/id/eprint/51810/10/1-s2.0-S0264817221000611-main.pdf https://oceanrep.geomar.de/id/eprint/51810/11/ScienceDirect_files_08Mar2021_08-17-52.306.zip https://doi.org/10.1016/j.marpetgeo.2021.104957 |
long_lat |
ENVELOPE(50.467,50.467,-66.967,-66.967) |
geographic |
Svalbard Lunde |
geographic_facet |
Svalbard Lunde |
genre |
Svalbard Svalbard margin Lunde |
genre_facet |
Svalbard Svalbard margin Lunde |
op_relation |
https://oceanrep.geomar.de/id/eprint/51810/10/1-s2.0-S0264817221000611-main.pdf https://oceanrep.geomar.de/id/eprint/51810/11/ScienceDirect_files_08Mar2021_08-17-52.306.zip Hong, W. L., Pape, T., Schmidt, C. , Yao, H., Wallmann, K. J. G. , Plaza-Faverola, A., Rae, J. W. B., Lepland, A., Bünz, S. and Bohrmann, G. (2021) Interactions between deep formation fluid and gas hydrate dynamics inferred from pore fluid geochemistry at active pockmarks of the Vestnesa Ridge, west Svalbard margin. Open Access Marine and Petroleum Geology, 127 . Art.Nr. 104957. DOI 10.1016/j.marpetgeo.2021.104957 <https://doi.org/10.1016/j.marpetgeo.2021.104957>. doi:10.1016/j.marpetgeo.2021.104957 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.marpetgeo.2021.104957 |
container_title |
Marine and Petroleum Geology |
container_volume |
127 |
container_start_page |
104957 |
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1790608742599884800 |