Foraminiferal δ18O reveals gas hydrate dissociation in Arctic and North Atlantic ocean sediments
Paleoceanographic investigations in the Arctic and north Atlantic are crucial to understanding past and current climate change, in particular considering amounts of pressure-temperature sensitive gas stored in marine sediments of the region. Many paleoceanographic studies are based on foraminiferal...
Published in: | Geo-Marine Letters |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Springer Science and Business Media LLC
2020
|
Subjects: | |
Online Access: | https://archimer.ifremer.fr/doc/00610/72215/71338.pdf https://doi.org/10.1007/s00367-019-00635-6 https://archimer.ifremer.fr/doc/00610/72215/ |
id |
ftarchimer:oai:archimer.ifremer.fr:72215 |
---|---|
record_format |
openpolar |
spelling |
ftarchimer:oai:archimer.ifremer.fr:72215 2023-05-15T14:49:20+02:00 Foraminiferal δ18O reveals gas hydrate dissociation in Arctic and North Atlantic ocean sediments Dessandier, Pierre-antoine Borrelli, Chiara Yao, Haoyi Sauer, Simone Hong, Wei-li Panieri, Giuliana 2020-08 application/pdf https://archimer.ifremer.fr/doc/00610/72215/71338.pdf https://doi.org/10.1007/s00367-019-00635-6 https://archimer.ifremer.fr/doc/00610/72215/ eng eng Springer Science and Business Media LLC https://archimer.ifremer.fr/doc/00610/72215/71338.pdf doi:10.1007/s00367-019-00635-6 https://archimer.ifremer.fr/doc/00610/72215/ info:eu-repo/semantics/openAccess restricted use Geo-marine Letters (0276-0460) (Springer Science and Business Media LLC), 2020-08 , Vol. 40 , N. 4 , P. 507-523 Foraminiferal stable isotopes Gas hydrates Authigenic carbonates Arctic Ocean North Atlantic Ocean text Publication info:eu-repo/semantics/article 2020 ftarchimer https://doi.org/10.1007/s00367-019-00635-6 2021-09-23T20:34:40Z Paleoceanographic investigations in the Arctic and north Atlantic are crucial to understanding past and current climate change, in particular considering amounts of pressure-temperature sensitive gas stored in marine sediments of the region. Many paleoceanographic studies are based on foraminiferal oxygen and carbon stable isotope compositions (δ18O, δ13C) from either planktonic specimens, benthic specimens or both. However, in seafloor regions promixal to high upward methane fluxes, such as where seafloor gas emission and shallow gas hydrate-bearing sediment occur, foraminiferal δ18O and δ13C display a wide range of values. Our study focuses on foraminiferal stable isotope signatures in shallow sediment at core sites in the Arctic and North Atlantic affected by significant upward flow of methane. This includes cores with shallow sulfate methane transitions that are adjacent to seeps and containing gas hydrate. We place emphasis on potential effects due to gas hydrate dissociation and diagenesis. Gas hydrate dissociation is known to increase pore-water δ18O, but our results indicate that precipitation of methane-derived authigenic carbonate (MDAC) also affects the foraminiferal δ18O of both planktonic and benthic species. In addition to this post-depositional overprint, we investigate the potential bias of the stable isotope record due to ontogenetic effects. Our data show that the size fraction does not impact the isotopic signal of planktonic and benthic foraminifera. Article in Journal/Newspaper Arctic Arctic Ocean Climate change Foraminifera* North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Arctic Arctic Ocean Geo-Marine Letters 40 4 507 523 |
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 |
Foraminiferal stable isotopes Gas hydrates Authigenic carbonates Arctic Ocean North Atlantic Ocean |
spellingShingle |
Foraminiferal stable isotopes Gas hydrates Authigenic carbonates Arctic Ocean North Atlantic Ocean Dessandier, Pierre-antoine Borrelli, Chiara Yao, Haoyi Sauer, Simone Hong, Wei-li Panieri, Giuliana Foraminiferal δ18O reveals gas hydrate dissociation in Arctic and North Atlantic ocean sediments |
topic_facet |
Foraminiferal stable isotopes Gas hydrates Authigenic carbonates Arctic Ocean North Atlantic Ocean |
description |
Paleoceanographic investigations in the Arctic and north Atlantic are crucial to understanding past and current climate change, in particular considering amounts of pressure-temperature sensitive gas stored in marine sediments of the region. Many paleoceanographic studies are based on foraminiferal oxygen and carbon stable isotope compositions (δ18O, δ13C) from either planktonic specimens, benthic specimens or both. However, in seafloor regions promixal to high upward methane fluxes, such as where seafloor gas emission and shallow gas hydrate-bearing sediment occur, foraminiferal δ18O and δ13C display a wide range of values. Our study focuses on foraminiferal stable isotope signatures in shallow sediment at core sites in the Arctic and North Atlantic affected by significant upward flow of methane. This includes cores with shallow sulfate methane transitions that are adjacent to seeps and containing gas hydrate. We place emphasis on potential effects due to gas hydrate dissociation and diagenesis. Gas hydrate dissociation is known to increase pore-water δ18O, but our results indicate that precipitation of methane-derived authigenic carbonate (MDAC) also affects the foraminiferal δ18O of both planktonic and benthic species. In addition to this post-depositional overprint, we investigate the potential bias of the stable isotope record due to ontogenetic effects. Our data show that the size fraction does not impact the isotopic signal of planktonic and benthic foraminifera. |
format |
Article in Journal/Newspaper |
author |
Dessandier, Pierre-antoine Borrelli, Chiara Yao, Haoyi Sauer, Simone Hong, Wei-li Panieri, Giuliana |
author_facet |
Dessandier, Pierre-antoine Borrelli, Chiara Yao, Haoyi Sauer, Simone Hong, Wei-li Panieri, Giuliana |
author_sort |
Dessandier, Pierre-antoine |
title |
Foraminiferal δ18O reveals gas hydrate dissociation in Arctic and North Atlantic ocean sediments |
title_short |
Foraminiferal δ18O reveals gas hydrate dissociation in Arctic and North Atlantic ocean sediments |
title_full |
Foraminiferal δ18O reveals gas hydrate dissociation in Arctic and North Atlantic ocean sediments |
title_fullStr |
Foraminiferal δ18O reveals gas hydrate dissociation in Arctic and North Atlantic ocean sediments |
title_full_unstemmed |
Foraminiferal δ18O reveals gas hydrate dissociation in Arctic and North Atlantic ocean sediments |
title_sort |
foraminiferal δ18o reveals gas hydrate dissociation in arctic and north atlantic ocean sediments |
publisher |
Springer Science and Business Media LLC |
publishDate |
2020 |
url |
https://archimer.ifremer.fr/doc/00610/72215/71338.pdf https://doi.org/10.1007/s00367-019-00635-6 https://archimer.ifremer.fr/doc/00610/72215/ |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Climate change Foraminifera* North Atlantic |
genre_facet |
Arctic Arctic Ocean Climate change Foraminifera* North Atlantic |
op_source |
Geo-marine Letters (0276-0460) (Springer Science and Business Media LLC), 2020-08 , Vol. 40 , N. 4 , P. 507-523 |
op_relation |
https://archimer.ifremer.fr/doc/00610/72215/71338.pdf doi:10.1007/s00367-019-00635-6 https://archimer.ifremer.fr/doc/00610/72215/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1007/s00367-019-00635-6 |
container_title |
Geo-Marine Letters |
container_volume |
40 |
container_issue |
4 |
container_start_page |
507 |
op_container_end_page |
523 |
_version_ |
1766320392953135104 |