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dc.contributor.authorDessandier, Pierre-Antoine
dc.contributor.authorBorrelli, Chiara
dc.contributor.authorYao, Haoyi
dc.contributor.authorSauer, Simone
dc.contributor.authorHong, Wei-Li
dc.contributor.authorPanieri, Giuliana
dc.date.accessioned2020-04-02T21:18:09Z
dc.date.available2020-04-02T21:18:09Z
dc.date.issued2020-01-07
dc.description.abstractPaleoceanographic 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 (δ<sup>18</sup>O, δ<sup>13</sup>C) 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 δ<sup>18</sup>O and δ<sup>13</sup>C 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 δ<sup>18</sup>O, but our results indicate that precipitation of methane-derived authigenic carbonate (MDAC) also affects the foraminiferal δ<sup>18</sup>O 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.en_US
dc.identifier.citationDessandier P, Borrelli C, Yao H, Sauer S, Hong H, Panieri G. Foraminiferal δ18O reveals gas hydrate dissociation in Arctic and North Atlantic ocean sediments. Geo-Marine Letters. 2020en_US
dc.identifier.cristinIDFRIDAID 1768752
dc.identifier.doi10.1007/s00367-019-00635-6
dc.identifier.issn0276-0460
dc.identifier.issn1432-1157
dc.identifier.urihttps://hdl.handle.net/10037/17990
dc.language.isoengen_US
dc.publisherSpringer Natureen_US
dc.relation.journalGeo-Marine Letters
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/PETROMAKS2/255150/Norway/Norwegian margin fluid systems and methane- derived carbonate crusts - Recent scientific advances in service of petroleum exploration//en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2020 Springer-Verlag GmbH Germany, part of Springer Natureen_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Stratigraphy and paleontology: 461en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Stratigrafi og paleontologi: 461en_US
dc.titleForaminiferal δ18O reveals gas hydrate dissociation in Arctic and North Atlantic ocean sedimentsen_US
dc.type.versionacceptedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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