Maria Winterfeld (e-mail: Maria.Winterfeld@awi.de), Lutz Schirrmeister (e-mail: Lutz.Schirrmeister@awi.de) and Pier Paul Overduin (e-mail: Paul.Overduin@awi.de), Alfred Wegener Institute for Polar and Marine Research, Telegrafenberg A43, D-14473 Potsdam, Germany; Mikhail N. Grigoriev (e-mail: firstname.lastname@example.org) and Viktor V. Kunitsky (e-mail: email@example.com), Melnikov Permafrost Institute, Siberian Branch, Russian Academy of Sciences, 677010, Yakutsk, Russia; Andrei A. Andreev (e-mail: firstname.lastname@example.org), University of Cologne, Institute of Geology and Mineralogy, Zuelpicher Strasse 49a, D-50674 Cologne, Germany; Andrew Murray (e-mail: email@example.com), Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, University of Aarhus, Risø National Laboratory, DK 4000 Roskilde, Denmark
Coastal permafrost landscape development since the Late Pleistocene in the western Laptev Sea, Siberia
Article first published online: 11 FEB 2011
© 2011 The Authors. Boreas © 2011 The Boreas Collegium
Volume 40, Issue 4, pages 697–713, October 2011
How to Cite
WINTERFELD, M., SCHIRRMEISTER, L., GRIGORIEV, M. N., KUNITSKY, V. V., ANDREEV, A., MURRAY, A. and OVERDUIN, P. P. (2011), Coastal permafrost landscape development since the Late Pleistocene in the western Laptev Sea, Siberia. Boreas, 40: 697–713. doi: 10.1111/j.1502-3885.2011.00203.x
- Issue published online: 27 SEP 2011
- Article first published online: 11 FEB 2011
- received 14th October 2009, accepted 15th December 2010.
Winterfeld, M., Schirrmeister, L., Grigoriev, M. N., Kunitsky, V. V., Andreev, A., Murray, A. & Overduin, P. P. 2011: Coastal permafrost landscape development since the Late Pleistocene in the western Laptev Sea, Siberia. Boreas, 10.1111/j.1502-3885.2011.00203.x. ISSN 0300-9483.
The palaeoenvironmental development of the western Laptev Sea is understood primarily from investigations of exposed cliffs and surface sediment cores from the shelf. In 2005, a core transect was drilled between the Taymyr Peninsula and the Lena Delta, an area that was part of the westernmost region of the non-glaciated Beringian landmass during the late Quaternary. The transect of five cores, one terrestrial and four marine, taken near Cape Mamontov Klyk reached 12 km offshore and 77 m below sea level. A multiproxy approach combined cryolithological, sedimentological, geochronological (14C-AMS, OSL on quartz, IR-OSL on feldspars) and palaeoecological (pollen, diatoms) methods. Our interpretation of the proxies focuses on landscape history and the transition of terrestrial into subsea permafrost. Marine interglacial deposits overlain by relict terrestrial permafrost within the same offshore core were encountered in the western Laptev Sea. Moreover, the marine interglacial deposits lay unexpectedly deep at 64 m below modern sea level 12 km from the current coastline, while no marine deposits were encountered onshore. This implies that the position of the Eemian coastline presumably was similar to today's. The landscape reconstruction suggests Eemian coastal lagoons and thermokarst lakes, followed by Early to Middle Weichselian fluvially dominated terrestrial deposition. During the Late Weichselian, this fluvial landscape was transformed into a poorly drained accumulation plain, characterized by widespread and broad ice-wedge polygons. Finally, the shelf plain was flooded by the sea during the Holocene, resulting in the inundation and degradation of terrestrial permafrost and its transformation into subsea permafrost.