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dc.contributor.authorWaage, Malin
dc.contributor.authorPortnov, Aleksei D
dc.contributor.authorSerov, Pavel
dc.contributor.authorBünz, Stefan
dc.contributor.authorWaghorn, Kate Alyse
dc.contributor.authorVadakkepuliyambatta, Sunil
dc.contributor.authorMienert, Jurgen
dc.contributor.authorAndreassen, Karin
dc.date.accessioned2019-01-24T11:57:40Z
dc.date.available2019-01-24T11:57:40Z
dc.date.issued2019-01-16
dc.description.abstractIn 2014, the discovery of seafloor mounds leaking methane gas into the water column in the northwestern Barents Sea became the first to document the existence of non‐permafrost related gas hydrate pingos (GHP) on the Eurasian Arctic shelf. The discovered site is given attention because the gas hydrates occur close to the upper limit of the gas hydrate stability, thus may be vulnerable to climatic forcing. In addition, this site lies on the regional Hornsund Fault Zone marking a transition between the oceanic and continental crust. The Hornsund Fault Zone is known to coincide with an extensive seafloor gas seepage area; however, until now lack of seismic data prevented connecting deep structural elements to shallow seepages. Here we use high‐resolution P‐Cable 3D seismic data to study the subsurface architecture of GHPs and underlying glacial and pre‐glacial deposits. The data show gas hydrates, authigenic carbonates and free gas within the GHPs on top of gas chimneys piercing a thin section of low‐permeability glacial‐sediments. The chimneys connect to faults within the underlying tilted and folded fluid and gas hydrate bearing sedimentary rocks. Correlation of our data with regional 2D seismic surveys shows a spatial connection between the shallow subsurface fluid flow system and the deep‐seated regional fault zone. We suggest that fault‐controlled Paleocene hydrocarbon reservoirs inject methane into the low‐permeability glacial deposits and near‐seabed sediments, forming the GHPs. This conceptual model explains the existence of climate sensitive gas hydrate inventories and extensive seabed methane release observed along the Svalbard‐Barents Sea margin.en_US
dc.description.sponsorshipVISTA – a basic research program in collaboration between The Norwegian Academy of Science and Letters, and Equinoren_US
dc.descriptionAccepted manuscript version. Accepted for publication in <i>Geochemistry Geophysics Geosystems</i>. Copyright 2019 American Geophysical Union. Further reproduction or electronic distribution is not permitted. Source at <a href=https://doi.org/10.1029/2018GC007930>https://doi.org/10.1029/2018GC007930</a>en_US
dc.identifier.citationWaage, M., Portnov, A.D., Serov, P., Bünz, S., Waghorn, K.A., Vadakkepuliyambatta, S., ... Andreassen, K. (2019). Geological controls on fluid flow and gas hydrate pingo development on the Barents Sea margin. <i>Geochemistry Geophysics Geosystems</i>. https://doi.org/10.1029/2018GC007930en_US
dc.identifier.cristinIDFRIDAID 1662178
dc.identifier.doi10.1029/2018GC007930
dc.identifier.issn1525-2027
dc.identifier.urihttps://hdl.handle.net/10037/14528
dc.language.isoengen_US
dc.publisherWileyen_US
dc.relation.ispartofWaage, M. (2019). 3D and 4D seismic investigations of fluid flow and gas hydrate systems. (Doctoral thesis). <a href=https://hdl.handle.net/10037/15078>https://hdl.handle.net/10037/15078</a>
dc.relation.journalGeochemistry Geophysics Geosystems
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: 450::Mineralogy, petrology, geochemistry: 462en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Mineralogi, petrologi, geokjemi: 462en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.subjectGas hydrate pingoen_US
dc.subjectfluid flowen_US
dc.subjectgas chimneyen_US
dc.subjectfaultsen_US
dc.subjectHornsund Fault Zoneen_US
dc.subjecthigh‐resolution 3D seismicen_US
dc.titleGeological controls on fluid flow and gas hydrate pingo development on the Barents Sea marginen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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