AMS 14С dating of Seyakha yedoma and January air palaeotemperatures for 25-21 cal ka BP based on the stable isotope compositions of syngenetic ice wedges

Авторы: Vasil'chuk Yu, Vasil'chuk A., Budantseva N.
Журнал: Radiocarbon
Том: 64
Номер: 6
Год издания: 2023
Издательство: American Journal of Science
Местоположение издательства: United States
Первая страница: 1419
Последняя страница: 1429
DOI: 10.1017/RDC.2022.15
Аннотация: 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.
Добавил в систему: Васильчук Алла Константиновна

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