Methane seepage at Vestnesa Ridge (NW Svalbard) since the Last Glacial Maximum
Multiple proxies in the geological record offshore NW Svalbard track shallow subseafloor diagenesis and seafloor methane seepage during the Last Glacial Maximum (LGM) extent and the disintegration of the Svalbard Barents Sea Ice Sheet (SBIS). Vestnesa Ridge, located at 79°N and in 1200 m water depth...
Published in: | Quaternary Science Reviews |
---|---|
Main Authors: | , , , , , , , , , |
Format: | Text |
Language: | unknown |
Published: |
University of New Hampshire Scholars' Repository
2018
|
Subjects: | |
Online Access: | https://scholars.unh.edu/faculty_pubs/510 https://doi.org/10.1016/j.quascirev.2018.06.006 |
id |
ftuninhampshire:oai:scholars.unh.edu:faculty_pubs-1509 |
---|---|
record_format |
openpolar |
spelling |
ftuninhampshire:oai:scholars.unh.edu:faculty_pubs-1509 2023-05-15T15:15:10+02:00 Methane seepage at Vestnesa Ridge (NW Svalbard) since the Last Glacial Maximum Schneider, Andrea Panieri, Giuliana Lepland, Aivo Consolaro, Chiara Cremiere, Antoine Forwick, Matthias Johnson, Joel E. Plaza-Faverola, Andreia Sauer, Simone Knies, Jochen 2018-08-01T07:00:00Z https://scholars.unh.edu/faculty_pubs/510 https://doi.org/10.1016/j.quascirev.2018.06.006 unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/faculty_pubs/510 https://doi.org/10.1016/j.quascirev.2018.06.006 © 2018 Elsevier Ltd. All rights reserved. Faculty Publications Micropaleontology Foraminifers Stable isotopes Methane seepage Authigenic carbonate Holocene Pleistocene Paleogeography Deglaciation Arctic Ocean text 2018 ftuninhampshire https://doi.org/10.1016/j.quascirev.2018.06.006 2023-01-30T21:50:25Z Multiple proxies in the geological record offshore NW Svalbard track shallow subseafloor diagenesis and seafloor methane seepage during the Last Glacial Maximum (LGM) extent and the disintegration of the Svalbard Barents Sea Ice Sheet (SBIS). Vestnesa Ridge, located at 79°N and in 1200 m water depth, is one of the northernmost known active methane seep sites and is characterised by a subseafloor fluid flow system, numerous seafloor pockmarks and gas flares in the water column. In this study, we develop a Late Pleistocene and Holocene stratigraphic framework, use stable oxygen and carbon isotope signatures (δ18O, δ13C) of benthic and planktic foraminifera, the mineralogical and carbon isotope composition of methane-derived authigenic carbonate (MDAC) and sediment geochemical data of ten sediment cores to assess methane seepage variability on Vestnesa Ridge. The studied cores cover the age range between 31.9 and 10 cal ka BP and record 32 negative δ13C excursions in benthic and planktic foraminifera with amplitudes down to −29 ‰ VPDB. These δ13C excursions are often associated with elevated Ca/Ti and Sr/Ti elemental ratios in sediments and MDAC nodules. The precipitation of MDAC overgrowth on foraminiferal tests explains most of the negative δ13C excursions. In this dataset, the oldest recorded methane emission episodes on Vestnesa Ridge occurred between the LGM (24–23.5 cal ka BP) and Heinrich Event 1 (HE 1; 17.7–16.8 cal ka BP). Geological indicators for past subseafloor methane cycling and seafloor methane seepage, such as negative foraminiferal δ13C excursions, MDAC nodules, and elevated Sr/Ti elemental ratios recorded in post-LGM sediments, possibly represent vertical migration of the sulphate-methane transition zone (SMTZ) and post-date sedimentation by up to 13.4 ka. However, it is important to note that indications of post-LGM seafloor methane seepage at Vestnesa Ridge also correspond to the established methane efflux chronology for the adjacent Barents Sea shelf, implying that glacio-isostatic adjustments ... Text Arctic Arctic Ocean Barents Sea Foraminifera* Ice Sheet Sea ice Svalbard Svalbard-Barents Sea Ice sheet University of New Hampshire: Scholars Repository Arctic Arctic Ocean Barents Sea Svalbard Quaternary Science Reviews 193 98 117 |
institution |
Open Polar |
collection |
University of New Hampshire: Scholars Repository |
op_collection_id |
ftuninhampshire |
language |
unknown |
topic |
Micropaleontology Foraminifers Stable isotopes Methane seepage Authigenic carbonate Holocene Pleistocene Paleogeography Deglaciation Arctic Ocean |
spellingShingle |
Micropaleontology Foraminifers Stable isotopes Methane seepage Authigenic carbonate Holocene Pleistocene Paleogeography Deglaciation Arctic Ocean Schneider, Andrea Panieri, Giuliana Lepland, Aivo Consolaro, Chiara Cremiere, Antoine Forwick, Matthias Johnson, Joel E. Plaza-Faverola, Andreia Sauer, Simone Knies, Jochen Methane seepage at Vestnesa Ridge (NW Svalbard) since the Last Glacial Maximum |
topic_facet |
Micropaleontology Foraminifers Stable isotopes Methane seepage Authigenic carbonate Holocene Pleistocene Paleogeography Deglaciation Arctic Ocean |
description |
Multiple proxies in the geological record offshore NW Svalbard track shallow subseafloor diagenesis and seafloor methane seepage during the Last Glacial Maximum (LGM) extent and the disintegration of the Svalbard Barents Sea Ice Sheet (SBIS). Vestnesa Ridge, located at 79°N and in 1200 m water depth, is one of the northernmost known active methane seep sites and is characterised by a subseafloor fluid flow system, numerous seafloor pockmarks and gas flares in the water column. In this study, we develop a Late Pleistocene and Holocene stratigraphic framework, use stable oxygen and carbon isotope signatures (δ18O, δ13C) of benthic and planktic foraminifera, the mineralogical and carbon isotope composition of methane-derived authigenic carbonate (MDAC) and sediment geochemical data of ten sediment cores to assess methane seepage variability on Vestnesa Ridge. The studied cores cover the age range between 31.9 and 10 cal ka BP and record 32 negative δ13C excursions in benthic and planktic foraminifera with amplitudes down to −29 ‰ VPDB. These δ13C excursions are often associated with elevated Ca/Ti and Sr/Ti elemental ratios in sediments and MDAC nodules. The precipitation of MDAC overgrowth on foraminiferal tests explains most of the negative δ13C excursions. In this dataset, the oldest recorded methane emission episodes on Vestnesa Ridge occurred between the LGM (24–23.5 cal ka BP) and Heinrich Event 1 (HE 1; 17.7–16.8 cal ka BP). Geological indicators for past subseafloor methane cycling and seafloor methane seepage, such as negative foraminiferal δ13C excursions, MDAC nodules, and elevated Sr/Ti elemental ratios recorded in post-LGM sediments, possibly represent vertical migration of the sulphate-methane transition zone (SMTZ) and post-date sedimentation by up to 13.4 ka. However, it is important to note that indications of post-LGM seafloor methane seepage at Vestnesa Ridge also correspond to the established methane efflux chronology for the adjacent Barents Sea shelf, implying that glacio-isostatic adjustments ... |
format |
Text |
author |
Schneider, Andrea Panieri, Giuliana Lepland, Aivo Consolaro, Chiara Cremiere, Antoine Forwick, Matthias Johnson, Joel E. Plaza-Faverola, Andreia Sauer, Simone Knies, Jochen |
author_facet |
Schneider, Andrea Panieri, Giuliana Lepland, Aivo Consolaro, Chiara Cremiere, Antoine Forwick, Matthias Johnson, Joel E. Plaza-Faverola, Andreia Sauer, Simone Knies, Jochen |
author_sort |
Schneider, Andrea |
title |
Methane seepage at Vestnesa Ridge (NW Svalbard) since the Last Glacial Maximum |
title_short |
Methane seepage at Vestnesa Ridge (NW Svalbard) since the Last Glacial Maximum |
title_full |
Methane seepage at Vestnesa Ridge (NW Svalbard) since the Last Glacial Maximum |
title_fullStr |
Methane seepage at Vestnesa Ridge (NW Svalbard) since the Last Glacial Maximum |
title_full_unstemmed |
Methane seepage at Vestnesa Ridge (NW Svalbard) since the Last Glacial Maximum |
title_sort |
methane seepage at vestnesa ridge (nw svalbard) since the last glacial maximum |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2018 |
url |
https://scholars.unh.edu/faculty_pubs/510 https://doi.org/10.1016/j.quascirev.2018.06.006 |
geographic |
Arctic Arctic Ocean Barents Sea Svalbard |
geographic_facet |
Arctic Arctic Ocean Barents Sea Svalbard |
genre |
Arctic Arctic Ocean Barents Sea Foraminifera* Ice Sheet Sea ice Svalbard Svalbard-Barents Sea Ice sheet |
genre_facet |
Arctic Arctic Ocean Barents Sea Foraminifera* Ice Sheet Sea ice Svalbard Svalbard-Barents Sea Ice sheet |
op_source |
Faculty Publications |
op_relation |
https://scholars.unh.edu/faculty_pubs/510 https://doi.org/10.1016/j.quascirev.2018.06.006 |
op_rights |
© 2018 Elsevier Ltd. All rights reserved. |
op_doi |
https://doi.org/10.1016/j.quascirev.2018.06.006 |
container_title |
Quaternary Science Reviews |
container_volume |
193 |
container_start_page |
98 |
op_container_end_page |
117 |
_version_ |
1766345550861434880 |