Research output: Contribution to journal › Article › peer-review
Mineralogical Indicators of Climate Changes in Southwestern Siberia in Holocene Sediments of Bolshie Toroki Lake. / Solotchina, E. P.; Kuzmin, M. I.; Solotchin, P. A. et al.
In: Doklady Earth Sciences, Vol. 496, No. 1, 01.2021, p. 17-23.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Mineralogical Indicators of Climate Changes in Southwestern Siberia in Holocene Sediments of Bolshie Toroki Lake
AU - Solotchina, E. P.
AU - Kuzmin, M. I.
AU - Solotchin, P. A.
AU - Maltsev, A. E.
AU - Leonova, G. A.
AU - Krivonogov, S. K.
N1 - Publisher Copyright: © 2021, Pleiades Publishing, Ltd. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021/1
Y1 - 2021/1
N2 - We present the results of studying the Holocene sediments of Bolshie Toroki Lake, a shallow brackish lake with carbonate sedimentation and high bioproductivity, located in the eastern part of Baraba lowland (southwestern Siberia). The mineral component of bottom sediments was studied by such methods as X-ray diffraction (XRD) analysis, IR spectroscopy, laser granulometry, elemental analysis, and others. By the mathematical modeling of complex XRD patterns, Mg-calcites with different Mg contents and aragonite have been established in the assemblage of carbonate minerals. Their structural and crystallochemical features and quantitative ratios were determined. The obtained high-resolution carbonate record was compared in the dated section with the distribution of the ash content, which is determined by the bioproductivity of the basin, and with a number of geochemical indicators of climate changes. The use of such a complex approach allowed us for the first time to recognize four stages in the evolution of Bolshie Toroki Lake; these stages were caused by cycles of drying/wetting of the regional climate and fluctuations of the lake level in the second half of the Holocene. Stage I (middle of the Atlantic) corresponded to the formation of the lake; stage II (second half of the Atlantic) was characterized by shallowing of the lake in a dry and warm climate; stage III (most of the Subboreal), shallow basin in a dry and cool climate; and stage IV (from the end of the Subboreal until the present) was marked by an increase in the water level of the lake and climate humidization.
AB - We present the results of studying the Holocene sediments of Bolshie Toroki Lake, a shallow brackish lake with carbonate sedimentation and high bioproductivity, located in the eastern part of Baraba lowland (southwestern Siberia). The mineral component of bottom sediments was studied by such methods as X-ray diffraction (XRD) analysis, IR spectroscopy, laser granulometry, elemental analysis, and others. By the mathematical modeling of complex XRD patterns, Mg-calcites with different Mg contents and aragonite have been established in the assemblage of carbonate minerals. Their structural and crystallochemical features and quantitative ratios were determined. The obtained high-resolution carbonate record was compared in the dated section with the distribution of the ash content, which is determined by the bioproductivity of the basin, and with a number of geochemical indicators of climate changes. The use of such a complex approach allowed us for the first time to recognize four stages in the evolution of Bolshie Toroki Lake; these stages were caused by cycles of drying/wetting of the regional climate and fluctuations of the lake level in the second half of the Holocene. Stage I (middle of the Atlantic) corresponded to the formation of the lake; stage II (second half of the Atlantic) was characterized by shallowing of the lake in a dry and warm climate; stage III (most of the Subboreal), shallow basin in a dry and cool climate; and stage IV (from the end of the Subboreal until the present) was marked by an increase in the water level of the lake and climate humidization.
KW - bottom sediments
KW - brackish lake
KW - carbonates
KW - geochemistry
KW - Holocene
KW - paleoclimate
KW - West Siberia
KW - XRD analysis
UR - http://www.scopus.com/inward/record.url?scp=85102128200&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/7ca5a466-f264-3101-bce0-b1092bd9641e/
U2 - 10.1134/S1028334X21010220
DO - 10.1134/S1028334X21010220
M3 - Article
AN - SCOPUS:85102128200
VL - 496
SP - 17
EP - 23
JO - Doklady Earth Sciences
JF - Doklady Earth Sciences
SN - 1028-334X
IS - 1
ER -
ID: 28013974