TY - JOUR

T1 - Carbonate Sedimentation in High-Mineralized Lake Bolshoi Bagan (South of West Siberia): Dependence on Holocene Climate Changes

AU - Solotchin, P. A.

AU - Solotchina, E. P.

AU - Maltsev, A. E.

AU - Leonova, G. A.

AU - Krivonogov, S. K.

AU - Zhdanova, A. N.

AU - Danilenko, I. V.

N1 - This work was performed under a state assignment of IGM SB RAS (No. 122041400243-9) with the support of the Ministry of Science and Higher Education of the Russian Federation and Russian Foundation for Basic Research (grant No. 21-55-53037 SFNS_a). The main analytical work was carried out in the Analytical Center for Multi-Elemental and Isotope Research (IGM SB RAS, Novosibirsk).

PY - 2023/9

Y1 - 2023/9

N2 - We present the results of comprehensive studies of Holocene bottom sediments from the shallow hypersaline (mineralization up to 282 g/L) Lake Bolshoi Bagan, located in the East Baraba lowland (south of Western Siberia). The research methods include X-ray diffractometry (XRD), IR spectroscopy, laser granulometry, scanning electron microscopy, elemental analysis of sediments and pore water, radiocarbon (14C AMS) dating. It has been found that during the Holocene an intensive authigenic mineral formation took place in the lake basin; gypsum, halite and carbonates of calcite-dolomite series dominate among the newly formed mineral phases. Mg-calcites with different Mg contents, excess-Ca dolomites, aragonite and occasionally Mg-siderite have been found in the assemblage of carbonate minerals by mathematical modeling of complex XRD patterns. Mineralogical and crystallochemical studies, supplemented by the results of geochemical analyses, allowed us to identify four stages of the evolution of Lake Bolshoi Bagan in the Holocene, due to regional climate variations. The boundaries of the stages in general correspond to the boundaries of the climatostratigraphic phases by the Blytt–Sernander system: Stage I (the end of the Boreal) – the lake formation, humid climate; Stage II (Atlantic) – climate aridization, shallowing of the lake; Stage III (Subboreal) – unstable climate, frequent change of conditions; Stage IV (Subatlantic) – moderately cool and dry climate.

AB - We present the results of comprehensive studies of Holocene bottom sediments from the shallow hypersaline (mineralization up to 282 g/L) Lake Bolshoi Bagan, located in the East Baraba lowland (south of Western Siberia). The research methods include X-ray diffractometry (XRD), IR spectroscopy, laser granulometry, scanning electron microscopy, elemental analysis of sediments and pore water, radiocarbon (14C AMS) dating. It has been found that during the Holocene an intensive authigenic mineral formation took place in the lake basin; gypsum, halite and carbonates of calcite-dolomite series dominate among the newly formed mineral phases. Mg-calcites with different Mg contents, excess-Ca dolomites, aragonite and occasionally Mg-siderite have been found in the assemblage of carbonate minerals by mathematical modeling of complex XRD patterns. Mineralogical and crystallochemical studies, supplemented by the results of geochemical analyses, allowed us to identify four stages of the evolution of Lake Bolshoi Bagan in the Holocene, due to regional climate variations. The boundaries of the stages in general correspond to the boundaries of the climatostratigraphic phases by the Blytt–Sernander system: Stage I (the end of the Boreal) – the lake formation, humid climate; Stage II (Atlantic) – climate aridization, shallowing of the lake; Stage III (Subboreal) – unstable climate, frequent change of conditions; Stage IV (Subatlantic) – moderately cool and dry climate.

KW - Holocene

KW - Western Siberia

KW - XRD analysis

KW - bottom sediments

KW - carbonates

KW - geochemistry

KW - hypersaline lake

KW - paleoclimate

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85170263993&origin=inward&txGid=f243fe23488cce36601129952067a489

UR - https://www.mendeley.com/catalogue/ca1ce37a-1b5b-3bf3-a3be-9346a881e3dc/

U2 - 10.2113/RGG20234567

DO - 10.2113/RGG20234567

M3 - Article

VL - 64

SP - 1098

EP - 1107

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 9

ER -