Replication Data for: Bivalve shell horizons in seafloor pockmarks of the last glacial-interglacial transition suggest a thousand years of methane emissions in the Arctic Ocean
The paper presents discrete bivalve shell horizons in two gravity cores from seafloor pockmarks on the Vestnesa Ridge (ca. 1200 m water depth), western Svalbard (79° 00’ N, 06° 55’ W) to provide insight into the temporal and spatial dynamics of seabed methane seeps. The shell beds, dominated by two...
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ftdataverseno:doi:10.18710/FWUKX0 2023-10-29T02:34:31+01:00 Replication Data for: Bivalve shell horizons in seafloor pockmarks of the last glacial-interglacial transition suggest a thousand years of methane emissions in the Arctic Ocean Ambrose, William G. Panieri, Giuliana Schneider, Andrea Plaza-Faverola, Andreia Carroll, Michael. L. Åström, Emmelie K. L. Locke V, William L. Carroll, JoLynn Longva, Leif 2016-05-19 https://doi.org/10.18710/FWUKX0 English eng DataverseNO https://doi.org/10.18710/FWUKX0 Earth and Environmental Sciences methane hydrate pockmarks shell beds foraminifera carbonate geochemistry faulting 2016 ftdataverseno https://doi.org/10.18710/FWUKX0 2023-10-04T22:53:51Z The paper presents discrete bivalve shell horizons in two gravity cores from seafloor pockmarks on the Vestnesa Ridge (ca. 1200 m water depth), western Svalbard (79° 00’ N, 06° 55’ W) to provide insight into the temporal and spatial dynamics of seabed methane seeps. The shell beds, dominated by two genera of the family Vesicomyidae: Phreagena s.l. and Isorropodon sp., were 20-30cm thick and centered at 250-400cm deep in the cores. The carbon isotope composition of inorganic (δ13C from -13.02‰ to +2.36‰) and organic (δ13C from -29.28‰ to -21.33‰) shell material and a two-end member mixing model indicate that these taxa derived between 8% and 43% of their nutrition from chemosynthetic bacteria. In addition, negative δ13C values for planktonic foraminifera (-6.7‰ to -3.1‰), micritic concretions identified as methane-derived authigenic carbonates, and pyrite encrusted fossil worm tubes at the shell horizons indicate a sustained paleo-methane seep environment. Combining sedimentation rates with 14C ages for bivalve material from the shell horizons, we estimate the horizons persisted for about 1000 years between approximately 17,707 to 16,680 yrs. BP (corrected). The seepage event over a 1000-year time interval was most likely associated with regional stress-related faulting and the subsequent release of over-pressurized fluids. Other/Unknown Material Arctic Arctic Ocean Foraminifera* Methane hydrate Planktonic foraminifera Svalbard DataverseNO |
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language |
English |
topic |
Earth and Environmental Sciences methane hydrate pockmarks shell beds foraminifera carbonate geochemistry faulting |
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Earth and Environmental Sciences methane hydrate pockmarks shell beds foraminifera carbonate geochemistry faulting Ambrose, William G. Panieri, Giuliana Schneider, Andrea Plaza-Faverola, Andreia Carroll, Michael. L. Åström, Emmelie K. L. Locke V, William L. Carroll, JoLynn Replication Data for: Bivalve shell horizons in seafloor pockmarks of the last glacial-interglacial transition suggest a thousand years of methane emissions in the Arctic Ocean |
topic_facet |
Earth and Environmental Sciences methane hydrate pockmarks shell beds foraminifera carbonate geochemistry faulting |
description |
The paper presents discrete bivalve shell horizons in two gravity cores from seafloor pockmarks on the Vestnesa Ridge (ca. 1200 m water depth), western Svalbard (79° 00’ N, 06° 55’ W) to provide insight into the temporal and spatial dynamics of seabed methane seeps. The shell beds, dominated by two genera of the family Vesicomyidae: Phreagena s.l. and Isorropodon sp., were 20-30cm thick and centered at 250-400cm deep in the cores. The carbon isotope composition of inorganic (δ13C from -13.02‰ to +2.36‰) and organic (δ13C from -29.28‰ to -21.33‰) shell material and a two-end member mixing model indicate that these taxa derived between 8% and 43% of their nutrition from chemosynthetic bacteria. In addition, negative δ13C values for planktonic foraminifera (-6.7‰ to -3.1‰), micritic concretions identified as methane-derived authigenic carbonates, and pyrite encrusted fossil worm tubes at the shell horizons indicate a sustained paleo-methane seep environment. Combining sedimentation rates with 14C ages for bivalve material from the shell horizons, we estimate the horizons persisted for about 1000 years between approximately 17,707 to 16,680 yrs. BP (corrected). The seepage event over a 1000-year time interval was most likely associated with regional stress-related faulting and the subsequent release of over-pressurized fluids. |
author2 |
Longva, Leif |
author |
Ambrose, William G. Panieri, Giuliana Schneider, Andrea Plaza-Faverola, Andreia Carroll, Michael. L. Åström, Emmelie K. L. Locke V, William L. Carroll, JoLynn |
author_facet |
Ambrose, William G. Panieri, Giuliana Schneider, Andrea Plaza-Faverola, Andreia Carroll, Michael. L. Åström, Emmelie K. L. Locke V, William L. Carroll, JoLynn |
author_sort |
Ambrose, William G. |
title |
Replication Data for: Bivalve shell horizons in seafloor pockmarks of the last glacial-interglacial transition suggest a thousand years of methane emissions in the Arctic Ocean |
title_short |
Replication Data for: Bivalve shell horizons in seafloor pockmarks of the last glacial-interglacial transition suggest a thousand years of methane emissions in the Arctic Ocean |
title_full |
Replication Data for: Bivalve shell horizons in seafloor pockmarks of the last glacial-interglacial transition suggest a thousand years of methane emissions in the Arctic Ocean |
title_fullStr |
Replication Data for: Bivalve shell horizons in seafloor pockmarks of the last glacial-interglacial transition suggest a thousand years of methane emissions in the Arctic Ocean |
title_full_unstemmed |
Replication Data for: Bivalve shell horizons in seafloor pockmarks of the last glacial-interglacial transition suggest a thousand years of methane emissions in the Arctic Ocean |
title_sort |
replication data for: bivalve shell horizons in seafloor pockmarks of the last glacial-interglacial transition suggest a thousand years of methane emissions in the arctic ocean |
publisher |
DataverseNO |
publishDate |
2016 |
url |
https://doi.org/10.18710/FWUKX0 |
genre |
Arctic Arctic Ocean Foraminifera* Methane hydrate Planktonic foraminifera Svalbard |
genre_facet |
Arctic Arctic Ocean Foraminifera* Methane hydrate Planktonic foraminifera Svalbard |
op_relation |
https://doi.org/10.18710/FWUKX0 |
op_doi |
https://doi.org/10.18710/FWUKX0 |
_version_ |
1781057144968183808 |