Sedimentary environments in the south-western Barents Sea during the last deglaciation and the Holocene: a case study outside the Ingøydjupet trough

Polar research

Øyvind Hammer¹  Mauro Pau² 

[1] Natural History Museum University of Oslo, PO Box 1172, Blindern, NO-0318 Oslo, NorwayCorrespondence;Physics of Geological Processes University of Oslo, PO Box 1048, Blindern, NO-0316 Oslo, Norway

关键词: Deglaciation;    Barents Sea ice sheet;    sediment cores;    lithofacies;    biozonation.;   

DOI  :  10.3402/polar.v35.23104

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

A lithological and foraminiferal study of newly acquired sediment cores outside the Ingøydjupet (Ingøy Deep) trough has been carried out to improve constraints on the last deglacial history in the south-western Barents Sea. Three lithofacies and three foraminiferal facies were identified. The lowermost lithological unit is a diamicton interpreted as glacial till. It contains a low-abundance, ecologically mixed foraminiferal assemblage, presumably resulting from glacial reworking. Above the diamicton, a layer of ice-rafted debris (IRD), likely associated with intensive iceberg production, marks the initial destabilization of the marine-based ice sheet. At this time, ca. 15.6–15.0 Ky B.P., opportunistic foraminiferal species Nonionellina labradorica and Stainforthia spp. reached peak abundance. During the south-western Barents Sea ice-margin retreat, presumably corresponding to the Bølling interstadial, a sequence of glaciomarine laminations was deposited conformably on the layer of IRD. Sedimentation rates...

【 授权许可】

CC BY-NC