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dc.contributor.authorPanieri, Giuliana
dc.contributor.authorBünz, Stefan
dc.contributor.authorFornari, Daniel J.
dc.contributor.authorEscartin, Javier
dc.contributor.authorSerov, Pavel
dc.contributor.authorJansson, Pär
dc.contributor.authorTorres, Marta E.
dc.contributor.authorHong, Wei-Li
dc.contributor.authorSauer, Simone
dc.contributor.authorGarcia, Rafael
dc.contributor.authorGracias, Nuno
dc.date.accessioned2018-07-26T07:24:18Z
dc.date.available2018-07-26T07:24:18Z
dc.date.issued2017-07-08
dc.description.abstractThe Vestnesa Ridge is a NW-SE trending, ~ 100 km-long, 1–2 km-thick contourite sediment section located in the Arctic Ocean, west of Svalbard, at 79°N. Pockmarks align along the ridge summit at water depths of ~ 1200 m; they are ~ 700 m in diameter and ~ 10 m deep relative to the surrounding seafloor. Observations of methane seepage in this area have been reported since 2008. Here we summarize and integrate the available information to date and report on the first detailed seafloor imaging and camera-guided multicore sampling at two of the most active pockmarks along Vestnesa Ridge, named Lomvi and Lunde. We correlate seafloor images with seismically defined subseafloor structures, providing a geological and ecological context to better understand pockmark formation. Subbottom and seismic surveys, water column imaging, geochemical data and seafloor observations indicate ongoing fluid flow at these pockmarks. Visual inspection and sampling using a high-resolution deep-sea camera and multicorer system show exposed gas hydrate and authigenic carbonate in association with biota within two of these pockmarks. Distributed methane venting at both Lomvi and Lunde supports extensive chemosynthetic communities that include filamentous sulfide-oxidizing bacteria and siboglinid tubeworms, all of which utilize chemical energy provided by the seeping fluids. Focused venting forms shallow gas hydrate, and sustains localized gas discharge from 50-m wide pits within the pockmarks. Cycles of carbonate precipitation and/or exhumation of carbonate deposits are indicated by scattered blocks of various size, pavements, and massive carbonate blocks up to 3 m high. Consistent with other observations along continental margin settings, we show that the extensive authigenic carbonate deposits in the Vestnesa pockmarks represent an important and prolonged methane carbon sink that prevents much of the upwardly flowing methane from reaching the overlying ocean.en_US
dc.descriptionAccepted manuscript version. Published version available at <a href=https://doi.org/10.1016/j.margeo.2017.06.006> https://doi.org/10.1016/j.margeo.2017.06.006</a>. Accepted manuscript version, licensed <a href=http://creativecommons.org/licenses/by-nc-nd/4.0/> CC BY-NC-ND 4.0.</a>en_US
dc.identifier.citationPanieri, G., Bünz, S., Fornari, D.J., Escartin, J., Serov, P., Jansson, P., ... Gracias, N. (2017). An integrated view of the methane system in the pockmarks at Vestnesa Ridge, 79°N. Marine Geology, 390, 282-300. https://doi.org/10.1016/j.margeo.2017.06.006en_US
dc.identifier.cristinIDFRIDAID 1481561
dc.identifier.doi10.1016/j.margeo.2017.06.006
dc.identifier.issn0025-3227
dc.identifier.issn1872-6151
dc.identifier.urihttps://hdl.handle.net/10037/13279
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalMarine Geology
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466en_US
dc.subjectFluid expulsionsen_US
dc.subjectMethaneen_US
dc.subjectPockmarksen_US
dc.subjectGas flaresen_US
dc.subjectSeepsen_US
dc.subjectGas hydrateen_US
dc.subjectPhotomosaicingen_US
dc.subjectCarbonate concretionsen_US
dc.subjectChemosynthetic organismsen_US
dc.subjectVestnesaen_US
dc.subjectArctic Oceanen_US
dc.titleAn integrated view of the methane system in the pockmarks at Vestnesa Ridge, 79°Nen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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