Академическое издательство «Гео»

Ice complex, isotopic composition, paleoclimatic conditions, cryogenesis



KRIOSFERA ZEMLI, 2009, Vol. XIII, № 3, p. 59-69

Isotopic composition of ice wedges of West Taymyr

I.D. Streletskaya, A.A. Vasiliev*

Lomonosov Moscow State University, Department of Geography, 119991, Moscow, Leninskie Gory, Russia, irinastrelets@gmail.com
*Earth Cryosphere Institute SB RAS, 625000, Tyumen, P/O box 1230, Russia

Five coastal exposures along Yenisei Gulf with thick polygonal ice-wedges have been under investigation from polar station Sopochnaya Karga (71°88´ N, 82°68´ E) to polar station Dickson (73°31´ N, 80°34´ E). The analysis of stable isotopes (δ18О, δD) of polygonal ice has shown that the heaviest isotope composition is characteristic of the Holocene ice-wedges near point Sopochnaya Karga (–19.0…–23.3 ‰ of δ18О and –140.0…–150.0 ‰ of δD). The lightest isotope composition is characteristic of the Late Pleistocene ice-wedges near Dickson (–24.3…–26.8 ‰ of δ18О and –185.0…–205.0 ‰ of δD). Results of isotope analysis evidence much colder Late Pleistocene conditions of icecomplex and ice-wedge formation in Western Taymyr as compared with modern analogs. The authors' data presented in this paper are in good agreement with similar investigations conducted previously near point Sablera (Lake Taymyr) and Lake Labaz.

Ice complex, isotopic composition, paleoclimatic conditions, cryogenesis
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