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dc.contributor.authorSchneider, Andrea
dc.contributor.authorPanieri, Giuliana
dc.contributor.authorLepland, Aivo
dc.contributor.authorConsolaro, Chiara
dc.contributor.authorCrémière, Antoine
dc.contributor.authorForwick, Matthias
dc.contributor.authorJohnson, J.E.
dc.contributor.authorPlaza-Faverola, Andreia
dc.contributor.authorSauer, Simone
dc.contributor.authorKnies, Jochen
dc.date.accessioned2018-10-03T08:36:13Z
dc.date.available2018-10-03T08:36:13Z
dc.date.issued2018-06-21
dc.description.abstract<p>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 (δ<sup>18</sup>O, δ<sup>13</sup>C) 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.</p> <p>The studied cores cover the age range between 31.9 and 10 cal ka BP and record 32 negative δ<sup>13</sup>C excursions in benthic and planktic foraminifera with amplitudes down to −29 ‰ VPDB. These δ<sup>13</sup>C 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 δ<sup>13</sup>C 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).</p> <p>Geological indicators for past subseafloor methane cycling and seafloor methane seepage, such as negative foraminiferal δ<sup>13</sup>C 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 and associated re-activation of pre-existing deep-seated faults after disintegration of the SBIS are likely important controlling factors on fluid migration towards the seafloor.</p>en_US
dc.description.sponsorshipPNRA (Italian National Antarctic Program)en_US
dc.descriptionAccepted manuscript version. Published version available at <a href=https://doi.org/10.1016/j.quascirev.2018.06.006> https://doi.org/10.1016/j.quascirev.2018.06.006</a>. Licensed <a href=http://creativecommons.org/licenses/by-nc-nd/4.0/> CC BY-NC-ND 4.0.</a>en_US
dc.identifier.citationSchneider, A., Panieri, G., Lepland, A., Consolaro, C., Crémière, A., Forwick, M., ... Knies, J. (2018). Methane seepage at Vestnesa Ridge (NW Svalbard) since the Last Glacial Maximum. Quaternary Science Reviews, 193, 98-117. https://doi.org/10.1016/j.quascirev.2018.06.006en_US
dc.identifier.cristinIDFRIDAID 1593167
dc.identifier.doi10.1016/j.quascirev.2018.06.006
dc.identifier.issn0277-3791
dc.identifier.issn1873-457X
dc.identifier.urihttps://hdl.handle.net/10037/13900
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalQuaternary Science Reviews
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.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Kvartærgeologi, glasiologi: 465en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Quaternary geology, glaciology: 465en_US
dc.subjectMicropaleontologyen_US
dc.subjectForaminifersen_US
dc.subjectStable isotopesen_US
dc.subjectMethane seepageen_US
dc.subjectAuthigenic carbonateen_US
dc.subjectHoloceneen_US
dc.subjectPleistoceneen_US
dc.subjectPaleogeographyen_US
dc.subjectDeglaciationen_US
dc.subjectArctic Oceanen_US
dc.titleMethane seepage at Vestnesa Ridge (NW Svalbard) since the Last Glacial Maximumen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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