The Holocene environmental changes revealed from the sediments of the Yarkov sub-basin of Lake Chany, south-western Siberia

Krivonogov S.K. Zhdanova A.N. Solotchin P.A. Kazansky A.Y. Chegis V.V. Liu Z. Song M. Zhilich S.V. Rudaya N.A. Cao X. Palagushkina O.V. Nazarova L.B. Syrykh L.S.
March 2023 Elsevier B.V.

Geoscience Frontiers
2023 #14 Issue 2

Lake Chany is the largest endorheic lake in Siberia whose catchment is entirely on the territory of Russia. Its geographical location on the climate-sensitive boundary of wet and dry landscapes provides an opportunity to gain more knowledge about environmental changes in the West Siberian interior during the Holocene and about the evolution of the lake itself. Sediment cores obtained from the Yarkov sub-basin of the lake in 2008 have been comprehensively studied by a number of approaches including sedimentology and AMS dating, pollen, diatom and chironomid analyses (with statistical interpretation of the results), mineralogy of authigenic minerals and geochemistry of plant lipids (biomarker analysis.). Synthesis of new results presented here and published data provides a good justification for our hypothesis that Lake Chany is very young, no older than 3.6 ka BP. Before that, between 9 and 3.6 ka BP, the Chany basin was a swampy landscape with a very low sedimentation rate; it could not be identified as a water body. In the early lake phase, between 3.6 and 1.5 ka BP, the lake was shallow, 1.2–3.5 m in depth, and it rose to its modern size, up to 6.5 m in depth, during the last millennium. Our data reveal important changes in the understanding of the history of this large endorheic lake, as before it was envisioned as a large lake with significant changes in water level since ca. 14 ka BP. In addition to hydrology, our proxies provide updates and details of the regional vegetation and climate change since ca. 4 ka BP in the West-Siberian forest-steppe and steppe. As evolution of the Chany basin is dependent on hydroclimatic changes in a large region of southern West Siberia, we compare lake-level change and climate-change proxies from the other recently and most comprehensively studied lakes of the region.

Climate , Environment , Holocene , Multiproxy study , Saline lake , West Siberia

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Institute of Geology and Mineralogy, Russian Academy of Sciences, Siberian Branch, Novosibirsk, Russian Federation
Novosibirsk State University, Novosibirsk, Russian Federation
Korkyt Ata Kyzylorda University, Kyzylorda, Kazakhstan
Moscow State University, Moscow, Russian Federation
Geological Institute, Russian Academy of Sciences, Moscow, Russian Federation
Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences, Troitsk, Russian Federation
Department of Earth Sciences, The University of Hong Kong, Hong Kong
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xian, China
Institute of Archaeology and Ethnography, Russian Academy of Sciences, Siberian Branch, Novosibirsk, Russian Federation
Tomsk State University, Tomsk, Russian Federation
Alpine Paleoecology and Human Adaptation Group (ALPHA), State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER), Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China
Volga Region Federal University, Kazan, Russian Federation
Krasnoyarsk Science Center, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation
Herzen State Pedagogical University, St. Petersburg, Russian Federation

Institute of Geology and Mineralogy
Novosibirsk State University
Korkyt Ata Kyzylorda University
Moscow State University
Geological Institute
Pushkov Institute of Terrestrial Magnetism
Department of Earth Sciences
State Key Laboratory of Loess and Quaternary Geology
Institute of Archaeology and Ethnography
Tomsk State University
Alpine Paleoecology and Human Adaptation Group (ALPHA)
Volga Region Federal University
Krasnoyarsk Science Center
Herzen State Pedagogical University

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