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EARLY HOLOCENE OXYGEN ISOTOPE CHRONOLOGIES (11,267–6420 CAL BP) FROM ICE WEDGE AT CHARA, TRANSBAIKALIA

Published online by Cambridge University Press:  04 April 2024

Yurij K Vasil’chuk
Affiliation:
Faculty of Geography, Lomonosov Moscow State University, Moscow, Russia
Alla C 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
Alexander P Ginzburg
Affiliation:
Faculty of Geography, Lomonosov Moscow State University, Moscow, Russia
Igor V Tokarev
Affiliation:
Science Park, Saint Petersburg State University, Saint Petersburg, Russia
Jessica Yu Vasil’chuk
Affiliation:
Faculty of Geography, Lomonosov Moscow State University, Moscow, Russia
*
*Corresponding author. Email: alla-vasilch@yandex.ru

Abstract

Accelerator mass spectrometry radiocarbon (AMS 14C) dating was used for determining the age of wedge ice. It has been found that between 11,270 and 6420 cal BP, or the Greenlandian and Northgrippian stages of the Holocene, ice wedges grew syngenetically in sandy deposits with gravel in the Chara River valley. The variations of δ18O values in the ice wedges are about 8‰, from –25.5‰ to –18.8‰. Based on the stable isotope composition of ice wedges, paleotemperature reconstructions revealed that the mean January temperature was as low as –38°C during the coldest periods of the early half of the Holocene and as high as –28°C during the warmer periods.

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

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