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dc.contributor.authorKnies, Jochen
dc.contributor.authorDaszinnies, Matthias Christian
dc.contributor.authorPlaza-Faverola, Andreia
dc.contributor.authorChand, Shyam
dc.contributor.authorSylta, Øyvind
dc.contributor.authorBünz, Stefan
dc.contributor.authorJohnson, Joel E
dc.contributor.authorMattingsdal, Rune
dc.contributor.authorMienert, Jurgen
dc.date.accessioned2019-03-21T12:41:47Z
dc.date.available2019-03-21T12:41:47Z
dc.date.issued2018-01-31
dc.description.abstractRecent observations of extensive methane release into the oceans and atmosphere have raised concern as to whether rising temperatures across the Arctic could drive rapid destabilization of gas hydrate reservoirs. Here, we report modelling results from hydrate-modulated methane seepage from Vestnesa Ridge, offshore western Svalbard, suggesting that continuous leakage has occurred from the seafloor since the early Pleistocene up until today. Sustained by modelled deep subsurface thermogenic sources of Miocene age, large scale hydrocarbon fluid migration started ~6 million years ago and reached the seafloor some 4 million years later. The modelling results indicate that widespread methane seepage offshore western Svalbard commenced in earnest during early Pleistocene, significantly older than late Holocene as previously reported. We propose that the onset of vertical hydrocarbon migration is the response of rapid burial of potential hydrocarbon sources induced by increased sediment deposition following the onset of Northern Hemisphere glaciations, ~2.7 million years ago. From the modelling results we propose that source rock intervals capable of generating hydrocarbons and hydrocarbon reservoirs buried kilometers deep have continuously fueled the gas hydrate system off western Svalbard for the past 2 million years. It is this hydrocarbon system that primarily controls the thermogenic methane fluxes and seepage variability at the seabed over geological times.en_US
dc.descriptionAccepted manuscript version, licensed <a href=http://creativecommons.org/licenses/by-nc-nd/4.0/> CC BY-NC-ND 4.0. </a> Source at: <a href=http://doi.org/10.1016/j.marpetgeo.2018.01.020> http://doi.org/10.1016/j.marpetgeo.2018.01.020 </a>en_US
dc.identifier.citationKnies, J., Daszinnies, M. C., Plaza-Faverola, A., Chand, S., Sylta, Ø., Bünz, S., ... Mienert J. (2018). Modelling persistent methane seepage offshore western Svalbard since early Pleistocene. <i>Marine and Petroleum Geology, 91</i>, 800-811. http://doi.org/10.1016/j.marpetgeo.2018.01.020en_US
dc.identifier.cristinIDFRIDAID 1561726
dc.identifier.doi10.1016/j.marpetgeo.2018.01.020
dc.identifier.issn0264-8172
dc.identifier.issn1873-4073
dc.identifier.urihttps://hdl.handle.net/10037/15042
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalMarine and Petroleum Geology
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.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::Mathematics and natural science: 400::Geosciences: 450en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.titleModelling persistent methane seepage offshore western Svalbard since early Pleistoceneen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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