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FIRST DIRECT RADIOCARBON DATING (22–27 CAL KA BP) OF MASSIVE ICE AT THE MECHIGMEN AND LAVRENTIYA BAYS COAST, EASTERN CHUKOTKA

Published online by Cambridge University Press:  26 March 2024

Yurij K Vasil’chuk*
Affiliation:
Faculty of Geography, Lomonosov Moscow State University, Moscow, Russia
Nadine A Budantseva
Affiliation:
Faculty of Geography, Lomonosov Moscow State University, Moscow, Russia
Alexey A Maslakov
Affiliation:
Faculty of Geography, Lomonosov Moscow State University, Moscow, Russia
Alla C Vasil’chuk
Affiliation:
Faculty of Geography, Lomonosov Moscow State University, Moscow, Russia
Jessica Yu Vasil’chuk
Affiliation:
Faculty of Geography, Lomonosov Moscow State University, Moscow, Russia
*
*Corresponding author. Email: vasilch_geo@mail.ru

Abstract

The Eastern Chukotka is considered a unique permafrost region where massive ice bodies are widespread. However, the origin and age of these ice formations are often discussed. The age of the massive ice of Chukotka was established for the first time using AMS 14C dating. It was revealed that three massive ice bodies on the coast of Mechigmen Bay were formed at the end of the Late Pleistocene: a) near the Akkani site, 21,612 to 22,147 cal BP; b) near the Lavrentiya settlement, 27,553 cal BP; and c) near the Lavrentiya settlement, 22,193 cal BP. Stable isotope values in the studied massive ice vary in a rather wide range by about 10‰ for δ18O values (from –14.8‰ to –24.5‰) and about 75‰ for the δ2H values (from –116‰ to –191‰). The studied massive ice bodies are of intrasedimental genesis and formed epigenetically during the final stage of MIS2 (22–27 cal ka BP).

Type
Research Article
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of University of Arizona

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