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dc.contributor.authorBellwald, Benjamin
dc.contributor.authorPlanke, Sverre
dc.contributor.authorLebedeva-Ivanova, Nina
dc.contributor.authorPiasecka, Emilia Daria
dc.contributor.authorAndreassen, Karin
dc.date.accessioned2019-02-22T09:42:02Z
dc.date.available2019-02-22T09:42:02Z
dc.date.issued2019-02-01
dc.description.abstractThe Quaternary sedimentary record in the Arctic captures a diverse and evolving range of landscapes reflecting cli-mate changes. Here we study the geological landform assemblage of the Upper Regional Unconformity (URU) in theSW Barents Sea. The aims are (i) to characterize buried geological landforms on a meter-scale resolution, (ii) to un-derstand their link with underlying structures, and (iii) to reconstruct paleo-ice-sheet dynamics and configurations.The data consist of a high-resolution three-dimensional (3D) P-Cable seismic cube with an extent of c. 200 km2andan inline separation of 6 m. Dominant frequencies of c. 150 Hz allow to image landforms at URU with a vertical res-olution of 1–5 m and a horizontal resolution of 3–6 m. We conduct detailed horizon-picking and seismic attributeanalysis of the buried URU horizon. We identified four sets of mega-scale glacial lineations, and shear band ridgeslocated to the west of a shear margin moraine. Other characteristic features include hill-hole pairs, transverse ridges,rhombohedral ridges and depressions, iceberg ploughmarks and pockmarks. Polygonal faults below URU anddeeper faults have a strong effect on the location of structures observed on URU. Bedrock packages deformeddown to 30 m below URU and up to 5 m-high transverse ridges at URU are imprints of glacio-tectonic activity.Deformed strata below URU indicate normal faulting superimposed by glaciotectonic deformation. The four setsof mega-scale glacial lineations indicate four streaming events with thawed glacial beds, with shear band ridgesforming in the shearing zone during one of these streaming events. Hill-hole pairs and rhombohedral ridges arefrozen-bed features which indicate a polythermal regime at the base of the Barents Sea Ice Sheet during multiplestreaming phases. This study therefore shows that paleo-ice streams have been temporarily frozen to the groundin the SW Barents Sea, and that landforms evidencing this freezing are associated with underlying faults.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> Published version available at <a href=https://doi.org/10.1016/j.geomorph.2019.01.019> https://doi.org/10.1016/j.geomorph.2019.01.019</a>.en_US
dc.identifier.citationBellwald, B., Planke, S., Lebedeva-Ivanova, N.N., Piasecka, E.D. & Andreassen, K. (2019). High-resolution landform assemblage along a buried glacio-erosive surface in the SW Barents Sea revealed by P-Cable 3D seismic data. <i>Geomorphology, 332</i>, 33-50. https://doi.org/10.1016/j.geomorph.2019.01.019en_US
dc.identifier.cristinIDFRIDAID 1676933
dc.identifier.doi10.1016/j.geomorph.2019.01.019
dc.identifier.issn0169-555X
dc.identifier.issn1872-695X
dc.identifier.urihttps://hdl.handle.net/10037/14749
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalGeomorphology
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223272/Norway/Centre for Earth Evolution and Dynamics/CEED/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.subjectUpper Regional Unconformityen_US
dc.subjectBarents Seaen_US
dc.subjectThermokarsten_US
dc.subjectHill-hole pairen_US
dc.subjectGlacial shearingen_US
dc.subjectSeismic geomorphologyen_US
dc.titleHigh-resolution landform assemblage along a buried glacio-erosive surface in the SW Barents Sea revealed by P-Cable 3D seismic dataen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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