The eastern extent of the Barents–Kara ice sheet during the Last Glacial Maximum based on seismic-reflection data from the eastern Kara Sea

Polar research

Frank Niessen¹  Leonid Polyak²  Valery Gainanov³  Valery Gataullin⁴ 

[1] Alfred-Wegener Institute for Polar and Marine Research, DE-27568 Bremerhaven, Germany;Byrd Polar Research Center, Ohio State University, Columbus, OH 43210, USACorrespondence;Faculty of Geology, Moscow State University, 119899 Moscow, Russia;GC Environmental, Ardsley, NY 10502, USA

关键词: Eurasian Arctic margin;    glacigenic sediments;    Kara Sea;    Last Glacial Maximum;    Pleistocene glaciations;    sub-bottom profiling.;   

DOI  :  10.1111/j.1751-8369.2008.00061.x

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

We present sub-bottom profiling (sparker and Parasound) results from the eastern Kara Sea, on the Eurasian Arctic margin, which enable the identification of the Last Glacial Maximum (LGM) ice extent. The analysed profiles show that glacigenic diamicton is ubiquitous at the seafloor, east of about 95°E and 78°N. The eastern margin of this diamicton is expressed in a conspicuous morainic ridge at the entrance to the Vilkitsky Strait, and to the south the diamicton projection aligns with the LGM limit mapped at the north-western Taymyr. The bottom of the Voronin Trough further north is also covered with diamicton and has numerous erosional bedforms, indicating a streamlined flow of grounded ice along the trough. Accurate dating of the diamicton is not attainable, but the correlation of pre-diamict sediments to well-dated sections in the Laptev Sea, and available 14C ages from sediments on top of the diamicton, indicate its LGM age. These results support the palaeogeographic reconstruction that assumes the ex...

【 授权许可】

CC BY-NC