Climatic signals in the Holocene carbonate sedimentary record of Namshi-Nur lake,West Baikal region |
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Authors: | Solotchina E P Sklyarov E V Vologina E G Solotchin P A Stolpovskaya V N Sklyarova O A Izokh O P Ukhova N N |
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Institution: | 1.Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Universitetskii pr. 3, Novosibirsk, 630090, Russia ;2.Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia ;3.Vinogradov Institute of Geochemistry and Analytical Chemistry, Siberian Branch, Russian Academy of Sciences, ul. Favorskogo 1a, Irkutsk, 664033, Russia ; |
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Abstract: | A new high-resolution Holocene climate record of the Western Baikal region from the evaporite sediments of one of the small
saline lakes with the carbonate type of sedimentation are obtained on the basis of detailed mineralogical and crystallochemical
studies of chemogenic carbonates. All carbonate phases occurring in the sediment are identified by decomposition of complex
XRD-profiles of carbonates into individual peaks using the Pearson VII function, and the quantitative relationships between
them are determined. Mg-calcites provide the major paleoclimatic information. The carbonate record contains data on the stratigraphic
distribution of Mg-calcites, in which the number and ratio between the phases of different magnesium contents are determined
by the past values of the Mg/Ca ratio, salinity, and total alkalinity of lake water that vary according to climatic cycles
and fluctuations of the lake level. The high potential of the approach proposed for paleoclimatic reconstructions is demonstrated. |
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