1 Section for Marine Geology, Faculty of Science, Aarhus University, Aarhus University2 GeoBiosphere Science Centre, Department of Geology, Quaternary Sciences, Lund University, Sölvegatan 12, SE-22362 Lund, Sweden3 Institute of Arctic and Alpine Research (INSTAAR), Campus Box 450, University of Colorado, Boulder, CO 80309-0450, USA4 Department of Geology and Geography, Askja, University of Island, IS-101 Reykjavík, Iceland5 Department of Earth and Environmental Sciences, University of Illinois at Chicago, 845 W. Taylor Street, Chicago, IL 60607-7059, USA6 Department of Geoscience, Science and Technology, Aarhus University7 Arctic and Antarctic Research Institute (AARI), 38 Bering Str., St.Petersburg 199397, Russia8 Geological Survey of Sweden, Villavägen 18, Box 670, SE-75128 Uppsala, Sweden9 VSEGEI (A.P.Karpinsky All Russia Research Geological Institute), 74 Sredny Prospect, St. Petersburg 199106, Russia10 Netherlands Institute for Fisheries Research (RIVO), Postbus 68, 1970 AB IJmuiden, The Netherlands11 Alfred-Wegener-Institut für Polar- und Meeresforschung, Forschungsstelle Potsdam, Telegrafenberg A43, 14473 Potsdam, Germany12 Department of Geoscience, Science and Technology, Aarhus University
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°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 14C, 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 >2000 m only 200 km from the deep Arctic Ocean, consistent with published evidence of ice grounding at ~1000 m 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.
Quaternary Science Reviews, 2006, Vol 25, p. 2894-2936
Severnaya Zemlya, Arctic Russia, Quaternary geology, sea-level history