Abstract
The work is aimed at determining the age of ice wedges, as well as at characterizing winter temperature fluctuations during the formation of the Yedoma based on the isotopic composition of ice wedges in the unique outcrop of the Batagay mega-slump. The researchers carried out a detailed sampling from the Upper Ice Wedge Complex of the Batagay Yedoma, determined the isotopic composition in three ice wedges at different altitudes. The results of radiocarbon dating of organic matter from ice wedge confirm the time of syngenetic formation of the upper-tier ice wedges in the range from 27.2 to 30.8 thousand cal. years. Ice wedges of the lower tier, according to the results of radiocarbon dating of ice accumulated 44.7—47.9 thousand years ago simultaneously at different levels: 274—268 m and 224—227 respectively. The study of yedoma deposits and ice-wedge ice made it possible to obtain data on climatic fluctuations in a region with the most severe continental climate. Direct radiocarbon dating of syngenetic ice wedges provided dating of ice growth in the Batagay yedoma, data on the content of stable isotopes in the ice demonstrated stable and very harsh conditions of the winter season. The air paleotemperature in Batagay in January 47—42 and 30—25 thousand cal. years ago was consistently low about –51°C.
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