A Eurasian Basin sedimentary record of glacial impact on the central Arctic Ocean during MIS 1–4

Linsen Dong, Leonid Polyak, Xiaotong Xiao, Stefanie Brachfeld, Yanguang Liu, Xuefa Shi, Xisheng Fang, Yazhi Bai, Aimei Zhu, Chaoxin Li, Song Zhao, Dong Wu, Chunjuan Wang

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Pronounced Quaternary circulation and depositional changes in the Arctic Ocean basins remain poorly understood. We investigate sediment core ARC5-ICE4 (ICE4) in the Eurasian (Amundsen) Basin off the Lomonosov Ridge to reconstruct glacial-interglacial variability in sediment sources and circulation. The ICE4 record features variable lithologies including distinct glacigenic deposits with Ice Rafted Debris (IRD). The sediment age is constrained by a combination of the organic carbon 14C with paleomagnetic data and correlation to earlier developed stratigraphies. The derived sedimentation rates constitute several cm/kyr (6.5 cm/kyr average) consistent with estimates from regional geophysical data. The developed age model covers the time interval from ca. 10 to 75 ka including Late and Middle Weichselian/Wisconsinian glaciations. Respective glacigenic sediments were primarily deposited by pulsed iceberg discharge. The Last Glacial Maximum and deglaciation is expressed in sharp IRD peaks including mineral proxies of the Laurentide Ice Sheet with an apparent millennial-scale variability. The older glacigenic sedimentary unit with abundant IRD of predominantly Siberian provenance was deposited during deglaciation of the Middle Weichselian (MIS 4/3) Eurasian Ice Sheet. These sedimentary differences indicate diverging impacts of the two glaciations on the Arctic Ocean, including ice-sheet sizes/geometries and oceanic circulation.

Original languageEnglish
Article number103993
JournalGlobal and Planetary Change
Volume219
DOIs
StatePublished - Dec 2022

Keywords

  • Arctic Ocean
  • Eurasian Basin
  • Glacial history
  • Late Pleistocene
  • Magnetostratigraphy
  • Paleoceanography
  • Radiocarbon dating
  • Sediment stratigraphy

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