The high-resolution oxygen isotope diagram of late Pleistocene ice wedges of Seyaha yedoma, Eastern Yamal Peninsula
- Authors: Vasil’chuk Y.K.1, Budantseva N.A.1, Vasil’chuk A.C.1
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Affiliations:
- Lomonosov Moscow State University
- Issue: Vol 487, No 2 (2019)
- Pages: 208-211
- Section: Geography
- URL: https://journals.eco-vector.com/0869-5652/article/view/15493
- DOI: https://doi.org/10.31857/S0869-56524872208-211
- ID: 15493
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Abstract
The main objective of this work is to study the oxygen isotope composition of late Pleistocene syngenetic ice wedges and to obtain a high-resolution isotope diagram from a carefully sampled outcrop of Seyaha yedoma within of the third lagoon-marine terrace near the Seyaha (Zelyonaya - Green) river mouth, on the bank of the Ob Bay. According to 3 new radiocarbon ages: from 25.2 to 23.3 kyr BP from +2 to +5 m a.s.l., as well as dates: 17.3 kyr from +18.8 m a.s.l. and 11.6 kyr BP from +21.2 m a.s.l., the age of the ice wedge is from 23 to 15 to 18 kyr BP approximately. Values of δ18O in the upper fragment of the ice wedge vary from -25.75 to -3.15‰. Horizontal variations of δ18O values at a height of +15.2 m amounted to 1.49‰, from -23.41 to -24.9‰. The ice of the lower fragment of the ice wedge, at +6 m a.s.l., is characterized by a wider range of δ18O values than in the upper fragment. The horizontal values of δ18O range from -23.41 to -26.63‰. The obtained oxygen isotope diagram in the upper fragment of the ice wedge has resolution of 80-100 years. According to palaeoreconstruction the average January temperature 23-15 (18) kyr BP ranged from -35 to -39 °C.
About the authors
Yu. K. Vasil’chuk
Lomonosov Moscow State University
Author for correspondence.
Email: vasilch_geo@mail.ru
Russian Federation, 1, Leninskie gory, Moscow, 119991
N. A. Budantseva
Lomonosov Moscow State University
Email: vasilch_geo@mail.ru
Russian Federation, 1, Leninskie gory, Moscow, 119991
A. C. Vasil’chuk
Lomonosov Moscow State University
Email: vasilch_geo@mail.ru
Russian Federation, 1, Leninskie gory, Moscow, 119991
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