Sedimentary deformation relating to episodic seepage in the last 1.2 million years: a multi-scale seismic study from the Vestnesa Ridge, eastern Fram Strait
Seafloor hydrocarbon seepage is a natural fluid release process that occurs worldwide on continental shelves, slopes, and in deep oceanic basins. The Vestnesa sedimentary ridge in the eastern Fram Strait hosts a deep-water gas hydrate system that became charged with hydrocarbons ∼2.7 Ma and has expe...
Published in: | Frontiers in Earth Science |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
frontiers media
2023
|
Subjects: | |
Online Access: | https://archimer.ifremer.fr/doc/00839/95130/102816.pdf https://archimer.ifremer.fr/doc/00839/95130/102817.docx https://archimer.ifremer.fr/doc/00839/95130/102818.docx https://doi.org/10.3389/feart.2023.1188737 https://archimer.ifremer.fr/doc/00839/95130/ |
id |
ftarchimer:oai:archimer.ifremer.fr:95130 |
---|---|
record_format |
openpolar |
spelling |
ftarchimer:oai:archimer.ifremer.fr:95130 2023-08-20T04:06:36+02:00 Sedimentary deformation relating to episodic seepage in the last 1.2 million years: a multi-scale seismic study from the Vestnesa Ridge, eastern Fram Strait Cooke, Frances Plaza-faverola, Andreia Bunz, Stefan Sultan, Nabil Ramachandran, Hariharan Bedle, Heather Patton, Henry Singhroha, Sunny Knies, Jochen 2023-05 application/pdf https://archimer.ifremer.fr/doc/00839/95130/102816.pdf https://archimer.ifremer.fr/doc/00839/95130/102817.docx https://archimer.ifremer.fr/doc/00839/95130/102818.docx https://doi.org/10.3389/feart.2023.1188737 https://archimer.ifremer.fr/doc/00839/95130/ eng eng frontiers media https://archimer.ifremer.fr/doc/00839/95130/102816.pdf https://archimer.ifremer.fr/doc/00839/95130/102817.docx https://archimer.ifremer.fr/doc/00839/95130/102818.docx doi:10.3389/feart.2023.1188737 https://archimer.ifremer.fr/doc/00839/95130/ info:eu-repo/semantics/openAccess restricted use Frontiers In Earth Science (2296-6463) (frontiers media), 2023-05 , Vol. 11 , P. 1188737 (17p.) sediment fracturing episodic seepage high-resolution seismic attributes glacial dynamics Fram Strait text Article info:eu-repo/semantics/article 2023 ftarchimer https://doi.org/10.3389/feart.2023.1188737 2023-08-01T22:51:09Z Seafloor hydrocarbon seepage is a natural fluid release process that occurs worldwide on continental shelves, slopes, and in deep oceanic basins. The Vestnesa sedimentary ridge in the eastern Fram Strait hosts a deep-water gas hydrate system that became charged with hydrocarbons ∼2.7 Ma and has experienced episodic seepage along the entire ridge until a few thousand years ago, when seepage activity apparently ceased in the west but persisted in the east. Although it has been documented that faults and fractures play a key role in feeding the seeps with thermogenic gases, the mechanisms controlling seepage periodicity remain poorly understood. Here we integrate high-resolution P-cable 3D seismic and Chirp data to investigate the spatial and temporal evolution of high-resolution fractures and fluid flow features in the west of the Vestnesa Ridge. We characterize sediment deformation using a fracture density seismic attribute workflow revealing two highly deformed stratigraphic intervals and associated small-scale pockmarks (<20 m diameter). Chronostratigraphic constraints from the region show that these two highly deformed intervals are influenced by at least three major climatic and oceanic events during the last 1.2 million years: the Mid-Pleistocene Transition (∼1.25–0.7 Ma), the penultimate deglaciation (∼130 ka) and the last deglaciation (Heinrich Stadial 1: ∼16 ka). These periods of deformation appear associated with seismic anomalies potentially correlated with buried methane-derived authigenic carbonate and have been sensitive to shifts in the boundary of the free gas-gas hydrate interface. Our results show shifts (up to ∼30 m) in the depth of the base of the gas hydrate stability zone (GHSZ) associated with major changes in ocean bottom water temperatures. This ocean-driven effect on the base of the GHSZ since the Last Glacial Maximum coincides with the already highly deformed Mid-Pleistocene Transition sedimentary interval and likely enhanced deformation and gas leakage along the ridge. Our results ... Article in Journal/Newspaper Fram Strait Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Frontiers in Earth Science 11 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
sediment fracturing episodic seepage high-resolution seismic attributes glacial dynamics Fram Strait |
spellingShingle |
sediment fracturing episodic seepage high-resolution seismic attributes glacial dynamics Fram Strait Cooke, Frances Plaza-faverola, Andreia Bunz, Stefan Sultan, Nabil Ramachandran, Hariharan Bedle, Heather Patton, Henry Singhroha, Sunny Knies, Jochen Sedimentary deformation relating to episodic seepage in the last 1.2 million years: a multi-scale seismic study from the Vestnesa Ridge, eastern Fram Strait |
topic_facet |
sediment fracturing episodic seepage high-resolution seismic attributes glacial dynamics Fram Strait |
description |
Seafloor hydrocarbon seepage is a natural fluid release process that occurs worldwide on continental shelves, slopes, and in deep oceanic basins. The Vestnesa sedimentary ridge in the eastern Fram Strait hosts a deep-water gas hydrate system that became charged with hydrocarbons ∼2.7 Ma and has experienced episodic seepage along the entire ridge until a few thousand years ago, when seepage activity apparently ceased in the west but persisted in the east. Although it has been documented that faults and fractures play a key role in feeding the seeps with thermogenic gases, the mechanisms controlling seepage periodicity remain poorly understood. Here we integrate high-resolution P-cable 3D seismic and Chirp data to investigate the spatial and temporal evolution of high-resolution fractures and fluid flow features in the west of the Vestnesa Ridge. We characterize sediment deformation using a fracture density seismic attribute workflow revealing two highly deformed stratigraphic intervals and associated small-scale pockmarks (<20 m diameter). Chronostratigraphic constraints from the region show that these two highly deformed intervals are influenced by at least three major climatic and oceanic events during the last 1.2 million years: the Mid-Pleistocene Transition (∼1.25–0.7 Ma), the penultimate deglaciation (∼130 ka) and the last deglaciation (Heinrich Stadial 1: ∼16 ka). These periods of deformation appear associated with seismic anomalies potentially correlated with buried methane-derived authigenic carbonate and have been sensitive to shifts in the boundary of the free gas-gas hydrate interface. Our results show shifts (up to ∼30 m) in the depth of the base of the gas hydrate stability zone (GHSZ) associated with major changes in ocean bottom water temperatures. This ocean-driven effect on the base of the GHSZ since the Last Glacial Maximum coincides with the already highly deformed Mid-Pleistocene Transition sedimentary interval and likely enhanced deformation and gas leakage along the ridge. Our results ... |
format |
Article in Journal/Newspaper |
author |
Cooke, Frances Plaza-faverola, Andreia Bunz, Stefan Sultan, Nabil Ramachandran, Hariharan Bedle, Heather Patton, Henry Singhroha, Sunny Knies, Jochen |
author_facet |
Cooke, Frances Plaza-faverola, Andreia Bunz, Stefan Sultan, Nabil Ramachandran, Hariharan Bedle, Heather Patton, Henry Singhroha, Sunny Knies, Jochen |
author_sort |
Cooke, Frances |
title |
Sedimentary deformation relating to episodic seepage in the last 1.2 million years: a multi-scale seismic study from the Vestnesa Ridge, eastern Fram Strait |
title_short |
Sedimentary deformation relating to episodic seepage in the last 1.2 million years: a multi-scale seismic study from the Vestnesa Ridge, eastern Fram Strait |
title_full |
Sedimentary deformation relating to episodic seepage in the last 1.2 million years: a multi-scale seismic study from the Vestnesa Ridge, eastern Fram Strait |
title_fullStr |
Sedimentary deformation relating to episodic seepage in the last 1.2 million years: a multi-scale seismic study from the Vestnesa Ridge, eastern Fram Strait |
title_full_unstemmed |
Sedimentary deformation relating to episodic seepage in the last 1.2 million years: a multi-scale seismic study from the Vestnesa Ridge, eastern Fram Strait |
title_sort |
sedimentary deformation relating to episodic seepage in the last 1.2 million years: a multi-scale seismic study from the vestnesa ridge, eastern fram strait |
publisher |
frontiers media |
publishDate |
2023 |
url |
https://archimer.ifremer.fr/doc/00839/95130/102816.pdf https://archimer.ifremer.fr/doc/00839/95130/102817.docx https://archimer.ifremer.fr/doc/00839/95130/102818.docx https://doi.org/10.3389/feart.2023.1188737 https://archimer.ifremer.fr/doc/00839/95130/ |
genre |
Fram Strait |
genre_facet |
Fram Strait |
op_source |
Frontiers In Earth Science (2296-6463) (frontiers media), 2023-05 , Vol. 11 , P. 1188737 (17p.) |
op_relation |
https://archimer.ifremer.fr/doc/00839/95130/102816.pdf https://archimer.ifremer.fr/doc/00839/95130/102817.docx https://archimer.ifremer.fr/doc/00839/95130/102818.docx doi:10.3389/feart.2023.1188737 https://archimer.ifremer.fr/doc/00839/95130/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.3389/feart.2023.1188737 |
container_title |
Frontiers in Earth Science |
container_volume |
11 |
_version_ |
1774717818606977024 |