Pollen, trace elements and stable isotope plots of Late Pleistocene ice wedges of Seyaha yedoma, Eastern Yamal Peninsula

Vasil'chuk, A.C.; Vasil'chuk, Y.K.; Budantseva, N.A.; Vasil'chuk, J.Y.

Авторы: Vasil'chuk A.C., Vasil'chuk Yu K., Budantseva N.A., Vasil'chuk J.Yu
Сборник: 5th European Conference on Permafrost, Book of Abstract
Тезисы
Год издания: 2018
Место издания: Laboratoire EDYTEM, CNRS, Université Savoie Mont-Blanc
Первая страница: 130
Последняя страница: 131
Аннотация: The Seyaha yedoma is located in eastern coast of Yamal Peninsula (70°10′00″ N, 72°30′30″ E). This sequence (height 22-24 m) is especially valuable for paleotemperature reconstruction because its accumulation was nearly continuous: from 30 to 11 ka BP and because of abundant syngenetic ice wedges. The previous oxygen isotope and radiocarbon results allowed aging the ice-wedge formation from 21 to 11 ka BP. The pollen plot of the large ice wedge represents three units corresponding to changes in taxa composition and their abundance. There are two trends in δ18О values; from +12 to +14.2 m a.s.l. the range in δ18О values is about 1.5‰, from –24.18 to –25.75 ‰, from +14.2 to +15.8 m a.s.l. there is clear upward increase in δ18О values from –25.75 to –23.15 ‰. New isotope data reveal that the average January temperature was –34 to –40 ºC from 23 to 15-18 ka BP. The tendency to upward increase in δ18О values may be explained by increase in average winter and average January temperatures during the final stages of ice-wedge formation. There are 3 maxima of trace element content in the upper part of the ice wedge as follows: at a height of 14.6-15.2 m for Fe, Si, Mn, P, Ba, Sr, Zn, Ni, Cu, Cd, Mo, Sb, Pb; at a height of 13.5-13.8 m for Fe, Si, Mn, Zn, Ba, Sr; and at a height of 12 m for Sb, Cd, Mo, Pb.
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