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Stable isotopes of oxygen and hydrogen in Holocene ice wedges on the western coast of Baydarata Bay, at the mouth of the Ngarka-Tambyakha River
Abstract.The object of this study is the ice wedges of Holocene age on the western coast of the Baydarata Bay, at the mouth of the Ngarka-Tambyakha River. In the coastal cliff structure of the thin polygonal peatland have been studied. The peatland is located in the upper part of the terrace 8-17 m high. The peat is underlain by gray icy loam with layered-lenticular cryogenic structure. Ice wedges revealed at the depth 0.8 m. Their width was 1.5-2 m, and outcropped height about 1.15 m high. One representative ice wedge was sampled across horizontal axis in the upper part, 9 samples were analyzed on a mass spectrometer, the oxygen isotope and hydrogen isotope composition of ice wedges was obtained. The main conclusions are: harsh winter air temperature in the area in Holocene varied between –16 and –19° С, which is about 10°С warmer compared to Late Pleistocene and were close to modern ones. Obtained results complement sparse information on Holocene winter air temperature for the Baydarata Bay coast.
Keywords: Baydarata Bay, Ngarka-Tambyakha, radiocarbon, Holocene, hydrogen isotopes, oxygen isotopes, modern ice vein, ice wedge, peatland, Arctic
Article was received:31-03-2018
This article written in Russian. You can find full text of article in Russian here .