Bivalve shell horizons in seafloor pockmarks of the last glacial-interglacial transition suggest a thousand years of methane emissions in the Arctic Ocean
Published version also available at http://dx.doi.org/10.1002/2015GC005980 We studied discrete bivalve shell horizons in two gravity cores from seafloor pockmarks on the Vestnesa Ridge (1200 m water depth) and western Svalbard (798000 N, 068550 W) to provide insight into the temporal and spatial dyn...
Published in: | Geochemistry, Geophysics, Geosystems |
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Online Access: | https://hdl.handle.net/10037/8544 https://doi.org/10.1002/2015GC005980 |
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ftunivtroemsoe:oai:munin.uit.no:10037/8544 2023-05-15T15:10:03+02:00 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 Panieri, Giuliana Schneider, Andrea Plaza-Faverola, Andreia Carroll, Michael Leslie Åström, Emmelie Locke, W.L. Carroll, JoLynn 2015-11-05 https://hdl.handle.net/10037/8544 https://doi.org/10.1002/2015GC005980 eng eng American Geophysical Union (AGU) Norges forskningsråd: 223259 Geochemistry Geophysics Geosystems 2015, 16(12):4108-4129 FRIDAID 1292824 doi:10.1002/2015GC005980 1525-2027 https://hdl.handle.net/10037/8544 URN:NBN:no-uit_munin_8120 openAccess VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 Journal article Tidsskriftartikkel Peer reviewed 2015 ftunivtroemsoe https://doi.org/10.1002/2015GC005980 2021-06-25T17:54:37Z Published version also available at http://dx.doi.org/10.1002/2015GC005980 We studied discrete bivalve shell horizons in two gravity cores from seafloor pockmarks on the Vestnesa Ridge (1200 m water depth) and western Svalbard (798000 N, 068550 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 20–30 cm thick and centered at 250– 400 cm deep in the cores. The carbon isotope composition of inorganic (d13C from 213.02& to 12.36&) and organic (d13C from 229.28& to 221.33&) 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 d13C values for planktonic foraminifera (26.7& to 23.1&), 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 and 16,680 years B.P. (corrected). The seepage event over a 1000 year time interval was most likely associated with regional stress-related faulting and the subsequent release of overpressurized fluids. Article in Journal/Newspaper Arctic Arctic Ocean Foraminifera* Planktonic foraminifera Svalbard University of Tromsø: Munin Open Research Archive Arctic Arctic Ocean Svalbard Geochemistry, Geophysics, Geosystems 16 12 4108 4129 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 Ambrose, William Panieri, Giuliana Schneider, Andrea Plaza-Faverola, Andreia Carroll, Michael Leslie Åström, Emmelie Locke, W.L. Carroll, JoLynn 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 |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466 VDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466 |
description |
Published version also available at http://dx.doi.org/10.1002/2015GC005980 We studied discrete bivalve shell horizons in two gravity cores from seafloor pockmarks on the Vestnesa Ridge (1200 m water depth) and western Svalbard (798000 N, 068550 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 20–30 cm thick and centered at 250– 400 cm deep in the cores. The carbon isotope composition of inorganic (d13C from 213.02& to 12.36&) and organic (d13C from 229.28& to 221.33&) 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 d13C values for planktonic foraminifera (26.7& to 23.1&), 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 and 16,680 years B.P. (corrected). The seepage event over a 1000 year time interval was most likely associated with regional stress-related faulting and the subsequent release of overpressurized fluids. |
format |
Article in Journal/Newspaper |
author |
Ambrose, William Panieri, Giuliana Schneider, Andrea Plaza-Faverola, Andreia Carroll, Michael Leslie Åström, Emmelie Locke, W.L. Carroll, JoLynn |
author_facet |
Ambrose, William Panieri, Giuliana Schneider, Andrea Plaza-Faverola, Andreia Carroll, Michael Leslie Åström, Emmelie Locke, W.L. Carroll, JoLynn |
author_sort |
Ambrose, William |
title |
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 |
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 |
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 |
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 |
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 |
bivalve shell horizons in seafloor pockmarks of the last glacial-interglacial transition suggest a thousand years of methane emissions in the arctic ocean |
publisher |
American Geophysical Union (AGU) |
publishDate |
2015 |
url |
https://hdl.handle.net/10037/8544 https://doi.org/10.1002/2015GC005980 |
geographic |
Arctic Arctic Ocean Svalbard |
geographic_facet |
Arctic Arctic Ocean Svalbard |
genre |
Arctic Arctic Ocean Foraminifera* Planktonic foraminifera Svalbard |
genre_facet |
Arctic Arctic Ocean Foraminifera* Planktonic foraminifera Svalbard |
op_relation |
Norges forskningsråd: 223259 Geochemistry Geophysics Geosystems 2015, 16(12):4108-4129 FRIDAID 1292824 doi:10.1002/2015GC005980 1525-2027 https://hdl.handle.net/10037/8544 URN:NBN:no-uit_munin_8120 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1002/2015GC005980 |
container_title |
Geochemistry, Geophysics, Geosystems |
container_volume |
16 |
container_issue |
12 |
container_start_page |
4108 |
op_container_end_page |
4129 |
_version_ |
1766341118853644288 |