New Oxygen Isotope Diagrams of Late Pleistocene and Holocene Ice Wedges in Mamontova Gora and Syrdakh Lake, Central Yakutia

Vasil’chuk, Y.K.; Shmelev, D.G.; Cherbunina, M.Y.; Budantseva, N.A.; Brushkov, A.V.; Vasil’chuk, A.C.

Авторы: Vasil’chuk Yu K., Shmelev D.G., Cherbunina M.Yu, Budantseva N.A., Brushkov A.V., Vasil’chuk A.C.
Журнал: Doklady Earth Sciences
Том: 486
Номер: 1
Год издания: 2019
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 580
Последняя страница: 584
Оригинальные версии: Новые изотопно-кислородные диаграммы позднеплейстоценовых и голоценовых повторно-жильных льдов Мамонтовой Горы и Сырдаха, Центральная Якутия
DOI: 10.1134/S1028334X19050283
Аннотация: This paper reports on the oxygen isotope composition of the Late Pleistocene and Holocene syngenetic ice wedges, which were exposed at Mamontova Gora and Syrdakh Lake, the Accelerator Mass Spectrometry dating, and the reconstruction of the winter air temperatures during ice wedge formation. Organic microinclusions from the ice wedges were directly dated, which allowed us to establish seven dates ranging from 13 to 19 ka. The age of the ice wedges is shown to be younger than 20 ka, but older than 10 ka BP. In the area of Mamontova Gora, δ18O is in the range of –24.7 to –30.9‰ for the Late Pleistocene ice wedges, and of –23.2 to –25.9‰ for the Holocene ice wedges. In the area of Syrdakh Lake, δ18O ranges from –29.2 to – 32.5‰. At the Mamontova Gora site, the average winter air temperatures, which were reconstructed from the isotope data, ranged from –28 to –31°C during most of the period when the Late Pleistocene ice wedges were formed; the January temperature was 42°C, 46°C. At the Syrdakh Lake site, the Late Pleistocene winter conditions were more severe: the average winter air temperature ranged from –30 to –32°C, and the average January air temperature was 44°C, –48°C. In the Holocene, the average winter air temperatures were higher and ranged from –25 to 28°C, while the average January temperatures ranged from –36 to –42°C.
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New Oxygen Isotope Diagrams of Late Pleistocene and Holocene Ice Wedges in Mamontova Gora and Syrdakh Lake, Central Yakutiaстатья

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