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Karl Ljung

Karl Ljung

Universitetsadjunkt

Karl Ljung

Severnaya Zemlya, Arctic Russia: a nucleation area for Kara Sea ice sheets during the Middle to Late Quaternary

Författare

  • Per Möller
  • D. Lubinski
  • Ó. Ingólfsson
  • S.L Forman
  • M-S. Siedenkrantz
  • D. Yu. Bolshiyanov
  • H. Lokrantz
  • O. Antonov
  • ´M. Pavlov
  • Karl Ljung
  • J.J. Zeeberg
  • A. Andreev
Visa allt

Summary, in English

Quaternary glacial stratigraphy and relative sea-level changes reveal at least four expansions of the Kara Sea ice sheet over the Severnaya Zemlya Archipelago at 79 degrees N in the Russian Arctic, as indicated from tills interbedded with marine sediments, exposed in stratigraphic superposition, and from raised-beach sequences that occur at altitudes up to 140 m a.s.l. Chronologic control is provided by AMS C-14, electron-spin resonance, green-stimulated luminescence, and aspartic-acid geochronology. Major glaciations followed by deglaciation and marine inundation occurred during MIS 10-9, MIS 8-7, MIS 6-5e and MIS 5d-3. The MIS 6-5e event, associated with the high marine limit, implies ice-sheet thickness of > 2000m only 200km from the deep Arctic Ocean, consistent with published evidence of ice grounding at similar to 1000m water depth in the central Arctic Ocean. Till fabrics and glacial tectonics record repeated expansions of local ice caps exclusively, suggesting wet-based ice cap advance followed by cold-based regional ice-sheet expansion. Local ice caps over highland sites along the perimeter of the shallow Kara Sea, including the Byrranga Mountains, appear to have repeatedly fostered initiation of a large Kara Sea ice sheet, with exception of the Last Glacial Maximum (MIS 2), when Kara Sea ice did not impact Severnaya Zemlya and barely graced northernmost Taymyr Peninsula.

Avdelning/ar

  • Kvartärgeologi

Publiceringsår

2006

Språk

Engelska

Sidor

2894-2936

Publikation/Tidskrift/Serie

Quaternary Science Reviews

Volym

25

Issue

21-22

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Geology

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0277-3791