Abstract
Using optically stimulated luminescence (OSL) dating, the deposits of the crest (ridge) landforms in the Tobol–Ishim interfluve (southwestern part of the West Siberian Plain), foot slope colluvial deposits on the right-bank terrace of the Ishim River valley and the dune sands in the Tobol River valley and its tributaries have been studied for the first time. The OSL ages obtained for the first time indicate older ages of crest deposits, than previously assumed, from 33.5 ± 1.5 to 25.8 ± 1.3 ka. The formation of the foot slope colluvial cover on the right bank of the Ishim River valley began ~22 ± 2.0 ka ago. Dune pine forest sands in the Tobol River valley relate to the later stage of aeolian accumulation and were formed due to secondary wind reworking of the alluvial sediments of the first terrace above the floodplain in the Late Glacial–Holocene. The uniformity of depositional conditions over the entire area of the crest relief in the study territory is revealed.
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ACKNOWLEDGMENTS
We are grateful to D.V. Nazarov (Karpinskii Russian Geological Research Institute, St. Petersburg) and A.V. Panin, corresponding member of the Russian Academy of Science, for valuable advice.
Funding
This work was carried out under a State Assignment, project no. 1021061810416-7, and was supported by the Russian Foundation for Basic Research, project no. 21-05-00734А.
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Larin, S.I., Kozlov, O.V., Larina, N.S. et al. First Experience on Optically Stimulated Luminescence Dating of the Crest Relief Deposits in the Tobol-Ishim Interfluve. Dokl. Earth Sc. 515, 573–580 (2024). https://doi.org/10.1134/S1028334X23603218
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DOI: https://doi.org/10.1134/S1028334X23603218