MINERALOGY OF HOLOCENE SEDIMENTS OF LAKE BOLSHOE YAROVOE (south of Western Siberia): THE ROLE OF THE CLIMATIC FACTOR
Solotchin P.A. Solotchina E.P. Maltsev A.E. Leonova G.A. Zhdanova A.N. Krivonogov S.K. Danilenko I.V.
November 2025Publishing House of Siberian Branch of the Russian Academy of Sciences
Russian Geology and Geophysics
2025#66Issue 111467 - 1475 pp.
We report the results of lithological and mineralogical studies of Holocene bottom sediments from the hypersaline Lake Bolshoe Yarovoe (salinity 150 g/L), located on the territory of the Kulunda steppe (south of Western Siberia). Research methods: X-ray diffractometry (XRD), IR spectroscopy, laser grain-size analysis, elemental analysis, and radiocarbon dating. The thickness of the uncovered sediments is 483 cm. Terrige-nous minerals throughout the section are represented by quartz, plagioclase, and layered silicates (mica, chlorite, smectite, and kaolinite). The variable amounts of omnipres-ent authigenic minerals include halite, gypsum, carbonates, and traces of pyrite. We identified Mg-calcites with different Mg contents and aragonite using the mathematical modeling of X-ray diffraction patterns in the assemblage of carbonate minerals. The mineralogical and crystallochemical studies of sediments supplemented by the results of other analyses have provided information about the evolution of the climate of the Kulunda steppe in the Middle to Late Holocene. The comparatively arid regional climate of the Middle Holocene became more humid in the first half of the Subatlantic, but aridization signs reappeared in the section about 600 years ago (Little Ice Age).
bottom sediment , carbonate , crystal chemistry , Holocene , Hypersaline lake , mineralogy , paleoclimate , Western Siberia , X-ray diffractometry
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V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russian Federation
Korkyt Ata Kyzylorda University, Aiteke bi 29A, Kyzylorda, 120014, Kazakhstan
V.S. Sobolev Institute of Geology and Mineralogy
Korkyt Ata Kyzylorda University
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