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dc.contributor.authorBellwald, Benjamin
dc.contributor.authorMaharjan, Dwarika
dc.contributor.authorPlanke, Sverre
dc.contributor.authorWinsborrow, Monica Caroline Mackay
dc.contributor.authorRydningen, Tom Arne
dc.contributor.authorAlexandropoulou, Nikolitsa
dc.contributor.authorMyklebust, Reidun
dc.date.accessioned2024-10-16T11:07:40Z
dc.date.available2024-10-16T11:07:40Z
dc.date.issued2024-10-02
dc.description.abstractSedimentary records of Early Pleistocene (~2.6–0.8 Ma) glaciations are sparse on shelves, yet trough mouth fans on adjacent continental slopes provide a continuous record of ice-sheet and climate development throughout the Quaternary. Here, we interpret high-quality 3D seismic reflection data combined with borehole and chronostratigraphic information from a shelf-slope setting in the southwestern Barents Sea to study meltwater and sediment inputs to the deep ocean, focusing on the onset of Pleistocene glaciations. Sandy deposits were brought to the slopes of the high-latitude Bear Island Fan by a preglacial contourite-turbidite system from ⁓2.6–2.4 Ma. Muddy glacigenic debris flows document the first shelf-edge glaciation at ⁓2.4 Ma. From 1.78–0.78 Ma, muddy turbiditycurrent- and debris-flow-derived sediments were delivered from shelf to slope via six tunnel valleys measuring up to 12 km in width and 200 m in depth. These tunnel valleys and associated downslope deposits formed during the 41-kyr climate cycles of the Early Pleistocene, and evidence abundant channelized, meltwater discharges from these glaciations. Following the mid-Pleistocene transition to 100-kyr cycles, a change in the style of glaciation is suggested by a change in landform and facies associations consistent with a reduced meltwater contribution. This study shows that the NorwegianBarents shelf was extensively glaciated in the Early Pleistocene, with a first shelf-edge glaciation from ~2.4 Ma.en_US
dc.identifier.citationBellwald B, Maharjan D, Planke S, Winsborrow M, Rydningen TA, Alexandropoulou N, Myklebust R. Major tunnel valleys and sedimentation changes document extensive Early Pleistocene glaciations of the Barents Sea. Communications Earth & Environment. 2024;5en_US
dc.identifier.cristinIDFRIDAID 2311584
dc.identifier.doi10.1038/s43247-024-01688-x
dc.identifier.issn2662-4435
dc.identifier.urihttps://hdl.handle.net/10037/35260
dc.language.isoengen_US
dc.publisherSpringer Natureen_US
dc.relation.journalCommunications Earth & Environment
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/H2020/860383/EU/SIGNAL PROPAGATION IN SOURCE TO SINK for the FUTUre of earth Ressources and Energies/S2S-Future/en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2024 The Author(s)en_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0en_US
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)en_US
dc.titleMajor tunnel valleys and sedimentation changes document extensive Early Pleistocene glaciations of the Barents Seaen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)