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dc.contributor.authorBellwald, Benjamin
dc.contributor.authorPlanke, Sverre
dc.contributor.authorPiasecka, Emilia Daria
dc.contributor.authorMatar, M.A.
dc.contributor.authorAndreassen, Karin
dc.date.accessioned2018-08-06T07:12:04Z
dc.date.available2018-08-06T07:12:04Z
dc.date.issued2018-03-07
dc.description.abstractRecent developments in seismic acquisition systems and seismic data visualization have contributed to improve the imaging of seismic geomorphologies over a broad range of topics. This study focuses on a new high-resolution P-Cable 3D seismic cube located in the Hoop area in the SW Barents Sea. The scientific motivations of the study are (1) to document glacial landforms on a meter-scale, (2) to study the link of these landforms with the subsurface, and (3) to understand ice-stream dynamics by detailed interpretation of main horizons, including the seabed, intra-glacial horizons, and Upper Regional Unconformity (URU). The horizons are assessed using the concept of seismic geomorphology, and compared with interpretations derived from conventional 3D seismic and state-of-the-art multibeam echosounder technologies to discuss the benefits and limitations of the different geophysical technologies. A well-defined intra-glacial seismic reflection is imaged in the eastern part of the P-Cable cube. This reflection has an overall NE-trending ridge-shaped morphology, which is up to 50 m high and 5–10 km wide, and interpreted as a shear margin moraine. The top of the moraine displays well-defined iceberg ploughmarks and clear slope failure events along its eastern flank. The seabed geomorphology, which has been directly shaped by glacial processes related to multiple phases of ice streaming, appears to be influenced by the buried shear margin moraine. Mega-scale glacial lineations (MSGLs) indicative of fast-flowing ice streams characterize the seabed west of the moraine. Infilled MSGLs and different sets of iceberg ploughmarks with large berms dominate the seabed geomorphology above the moraine. The seabed east of the moraine, characterized by a smooth morphology and few pockmarks, is inferred to reflect more slowly-moving ice. Not resolved by other geophysical techniques, seismic attribute maps of P-Cable 3D allowed the identification of smaller ploughmarks and corrugated ridges related to paleo tides. Eroded by the larger iceberg ploughmarks, these small ploughmarks are suggested to be linked to an earlier rapid disintegration of the Barents Sea Ice Stream. The new high-resolution 3D seismic data have led to the development of a revised ice-stream model of the Barents Sea, linking the glacial deposits to different ice stream events.en_US
dc.descriptionAccepted manuscript version. Published version available at <a href=https://doi.org/10.1016/j.margeo.2018.03.002> https://doi.org/10.1016/j.margeo.2018.03.002</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.citationBellwald, B., Planke, S., Piasecka, E.D., Matar, M.A. & Andreassen, K. (2018). Ice-stream dynamics of the SW Barents Sea revealed by high-resolution 3D seismic imaging of glacial deposits in the Hoop area. Marine Geology, 402, 165-183. https://doi.org/10.1016/j.margeo.2018.03.002en_US
dc.identifier.cristinIDFRIDAID 1573780
dc.identifier.doi10.1016/j.margeo.2018.03.002
dc.identifier.issn0025-3227
dc.identifier.issn1872-6151
dc.identifier.urihttps://hdl.handle.net/10037/13354
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalMarine Geology
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/FP7-PEOPLE/317217/EU/GLANAM (Glaciated North Atlantic Margins)/GLANAM/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::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466en_US
dc.subjectHigh-resolution 3D seismicen_US
dc.subjectBarents Seaen_US
dc.subjectShear margin moraineen_US
dc.subjectMega-scale glacial lineationsen_US
dc.subjectIceberg ploughmarksen_US
dc.titleIce-stream dynamics of the SW Barents Sea revealed by high-resolution 3D seismic imaging of glacial deposits in the Hoop areaen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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