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AMS 14C DATING OF SEYAKHA YEDOMA AND JANUARY AIR PALAEOTEMPERATURES FOR 25–21 CAL KA BP BASED ON THE STABLE ISOTOPE COMPOSITIONS OF SYNGENETIC ICE WEDGES

Published online by Cambridge University Press:  08 April 2022

Yurij Vasil’chuk Open the ORCID record for Yurij Vasil’chuk [Opens in a new window] ,
Alla Vasil’chuk Open the ORCID record for Alla Vasil’chuk [Opens in a new window]  and
Nadine Budantseva Open the ORCID record for Nadine Budantseva [Opens in a new window]
Yurij Vasil’chuk*
Affiliation:
Department of Geography, Lomonosov Moscow State University, 119991, Moscow, Russia
Alla Vasil’chuk
Affiliation:
Department of Geography, Lomonosov Moscow State University, 119991, Moscow, Russia
Nadine Budantseva
Affiliation:
Department of Geography, Lomonosov Moscow State University, 119991, Moscow, Russia
*
*Corresponding author. Email: [email protected]
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Abstract

Yedoma sediments with thick syngenetic ice wedges have been studied on the Yamal Peninsula, northwestern Siberia. The accumulation of yedoma strata occurred under alternating subaqueous-subaerial conditions, and three tiers of ice wedge were formed mainly on subaerial stages. The ice wedges and enclosing sediments were dated, revealing that the ice wedges were formed between 29 and 18 cal ka BP, while the enclosing sediments are generally older, possibly due to contamination with ancient material (especially in the central part of the yedoma). However, the termination of yedoma complex formation was dated not later than 13.5 cal ka BP. Stable oxygen-isotope data for the ice wedges indicate more severe winter climate conditions during 25–21 cal ka BP, when mean January air temperatures were at least 10°C lower that modern ones, favoring syngenetic ice wedge growth. Yedoma accumulation in the western part of northern Siberia does not support the existence here of an ice sheet during the LGM.

Keywords

mean January palaeotemperaturenorthwestern Siberiaradiocarbon ageyedomaice wedges
Type
Conference Paper
Information
Radiocarbon , Volume 64 , Issue 6: 3rd Radiocarbon in the Environment Conference Gliwice, Poland, July 5–9, 2021 , December 2022 , pp. 1419 - 1429
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Copyright
© The Author(s), 2022. Published by Cambridge University Press for the Arizona Board of Regents on behalf of the University of Arizona

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Footnotes

Selected Papers from the 3rd Radiocarbon in the Environment Conference, Gliwice, Poland, 5–9 July 2021

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