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dc.contributor.authorNielsen, Tove
dc.contributor.authorLaier, Troels
dc.contributor.authorKuijpers, Antoon
dc.contributor.authorRasmussen, Tine Lander
dc.contributor.authorMikkelsen, Naja E.
dc.contributor.authorNørgård-Pedersen, Niels
dc.date.accessioned2018-08-20T09:30:31Z
dc.date.available2018-08-20T09:30:31Z
dc.date.issued2014-09-04
dc.description.abstractThe present study is the first to directly address the issue of gas hydrates offshore West Greenland, where numerous occurrences of shallow hydrocarbons have been documented in the vicinity of Disko Bugt (Bay). Furthermore, decomposing gas hydrate has been implied to explain seabed features in this climate-sensitive area. The study is based on archive data and new (2011, 2012) shallow seismic and sediment core data. Archive seismic records crossing an elongated depression (20×35 km large, 575 m deep) on the inner shelf west of Disko Bugt (Bay) show a bottom simulating reflector (BSR) within faulted Mesozoic strata, consistent with the occurrence of gas hydrates. Moreover, the more recently acquired shallow seismic data reveal gas/fluid-related features in the overlying sediments, and geochemical data point to methane migration from a deeper-lying petroleum system. By contrast, hydrocarbon signatures within faulted Mesozoic strata below the strait known as the Vaigat can be inferred on archive seismics, but no BSR was visible. New seismic data provide evidence of various gas/fluid-releasing features in the overlying sediments. Flares were detected by the echo-sounder in July 2012, and cores contained ikaite and showed gas-releasing cracks and bubbles, all pointing to ongoing methane seepage in the strait. Observed seabed mounds also sustain gas seepages. For areas where crystalline bedrock is covered only by Pleistocene–Holocene deposits, methane was found only in the Egedesminde Dyb (Trough). There was a strong increase in methane concentration with depth, but no free gas. This is likely due to the formation of gas hydrate and the limited thickness of the sediment infill. Seabed depressions off Ilulissat Isfjord (Icefjord) previously inferred to express ongoing gas release from decomposing gas hydrate show no evidence of gas seepage, and are more likely a result of neo-tectonism.en_US
dc.description.sponsorshipGeocenter Denmark Danish Centre for Marine Research Greenland Institute for Natural Resources Royal Netherlands Institute for Sea Researchen_US
dc.descriptionThis is a pre-print of an article published in Geo-Marine Letters. The final authenticated version is available online at <a href=https://doi.org/10.1007/s00367-014-0382-2> https://doi.org/10.1007/s00367-014-0382-2 </a>en_US
dc.identifier.citationNielsen, T., Laier, T., Kuijpers, A., Rasmussen, T.L., Mikkelsen, N.E. & Nørgård-Pedersen, N. (2014). Fluid flow and methane occurrences in the Disko Bugt area offshore West Greenland: indications for gas hydrates? Geo-Marine Letters, 34(6), 511-523. https://doi.org/10.1007/s00367-014-0382-2.en_US
dc.identifier.cristinIDFRIDAID 1153418
dc.identifier.doi10.1007/s00367-014-0382-2
dc.identifier.issn0276-0460
dc.identifier.issn1432-1157
dc.identifier.urihttps://hdl.handle.net/10037/13479
dc.language.isoengen_US
dc.publisherSpringer Verlagen_US
dc.relation.journalGeo-Marine Letters
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/H2020-EU.2.1.1.4./644385/EU/ PERvasive Serious GAMes suppOrted by Virtual CoachiNg/PERGAMON/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.subjectTotal Organic Carbonen_US
dc.subjectDissolve Inorganic Carbonen_US
dc.subjectLast Glacial Maximumen_US
dc.subjectCore Siteen_US
dc.subjectGravity Coreen_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.titleFluid flow and methane occurrences in the Disko Bugt area offshore West Greenland: indications for gas hydrates?en_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePreprinten_US
dc.typeManuskripten_US


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