TY - JOUR

T1 - Sedimentary Record of Bolshoi Bagan Lake (Western Siberia): Response to Holocene Climatic Events

AU - Solotchin, P. A.

AU - Kuzmin, M. I.

AU - Solotchina, E. P.

AU - Maltsev, A. E.

AU - Leonova, G. A.

AU - Zhdanova, A. N.

AU - Krivonogov, S. K.

N1 - Funding Information: This work was carried out according to a State Assignment of the Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, with the support of the Russian Foundation for Basic Research (project nos. 21-55-53037 GFEN_a and 19-29-05085 mc). The main analytical work was carried out in the Center for Common Use of Multielement and Isotope Studies, Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, and in the Center for Common Use “Geochronology of the Cenozoic” Siberian Branch, Russian Academy of Sciences. Publisher Copyright: © 2022, Pleiades Publishing, Ltd.

PY - 2022/10

Y1 - 2022/10

N2 - The results of lithological and mineralogical studies of the Holocene bottom sediments from the shallow hypersaline (mineralization up to 282 g/L) Bolshoi Bagan Lake, located in the East Baraba Lowland (southwestern Siberia), are presented. The research methods included X-ray diffractometry (XRD), infrared spectroscopy, laser grain size analysis, scanning electron microscopy, elemental composition study, and radiocarbon (14C AMS) dating. It was found that intensive authigenic minerogenesis occurred in the lake basin during the Holocene. Halite, gypsum, and carbonates dominate among the newly formed mineral phases. Mg-calcites with different Mg contents, excess-Ca dolomites, aragonite, and occasionally Mg-siderite have been established in the assemblage of carbonate minerals by the mathematical modeling of complex XRD patterns. The mineralogical and crystallochemical studies, supplemented by the results of other analyses, allowed us to identify four stages of the evolution of Bolshoi Bagan Lake in the Holocene, due to variations in the regional climate. The boundaries of the stages generally correspond to the boundaries of the climatic stratigraphical phases by the Blytt–Sernander classification: stage I (the end of the Boreal), lake formation, humid climate; stage II (Atlantic), climate drying, shallowing of the lake; stage III (Subboreal), unstable climate, frequent change of conditions; stage IV (Sub-Atlantic), moderately cool and dry climate. The mineralogical signals of the global climatic Bond events in southwestern Siberia have been identified.

AB - The results of lithological and mineralogical studies of the Holocene bottom sediments from the shallow hypersaline (mineralization up to 282 g/L) Bolshoi Bagan Lake, located in the East Baraba Lowland (southwestern Siberia), are presented. The research methods included X-ray diffractometry (XRD), infrared spectroscopy, laser grain size analysis, scanning electron microscopy, elemental composition study, and radiocarbon (14C AMS) dating. It was found that intensive authigenic minerogenesis occurred in the lake basin during the Holocene. Halite, gypsum, and carbonates dominate among the newly formed mineral phases. Mg-calcites with different Mg contents, excess-Ca dolomites, aragonite, and occasionally Mg-siderite have been established in the assemblage of carbonate minerals by the mathematical modeling of complex XRD patterns. The mineralogical and crystallochemical studies, supplemented by the results of other analyses, allowed us to identify four stages of the evolution of Bolshoi Bagan Lake in the Holocene, due to variations in the regional climate. The boundaries of the stages generally correspond to the boundaries of the climatic stratigraphical phases by the Blytt–Sernander classification: stage I (the end of the Boreal), lake formation, humid climate; stage II (Atlantic), climate drying, shallowing of the lake; stage III (Subboreal), unstable climate, frequent change of conditions; stage IV (Sub-Atlantic), moderately cool and dry climate. The mineralogical signals of the global climatic Bond events in southwestern Siberia have been identified.

KW - bottom sediments

KW - carbonates

KW - geochemistry

KW - Holocene

KW - hypersaline lake

KW - paleoclimate

KW - Western Siberia

KW - XRD analysis

UR - http://www.scopus.com/inward/record.url?scp=85141886548&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/808d335a-51b9-3c2d-aae2-f0fa396deb24/

U2 - 10.1134/S1028334X22700271

DO - 10.1134/S1028334X22700271

M3 - Article

AN - SCOPUS:85141886548

VL - 506

SP - 768

EP - 774

JO - Doklady Earth Sciences

JF - Doklady Earth Sciences

SN - 1028-334X

IS - 2

ER -