Article
Article name Authigenic carbonate formation in shallow lacustrine basins of Western Transbaikalia
Authors Solotchina E.. ,
Sklyarov E.. ,
Strakhovenko V.. ,
Zhdanova A.. ,
Danilenko I.. ,
Solotchin, P.. candidate of geological and mineralogical sciences, senior researcher, paul@igm.nsc.ru
Bibliographic description
Category Earth science
DOI 549.742:552.143
DOI 10.21209/2227-­9245-­2018-­24-­6­-45-­54
Article type Scientific
Annotation Sediments of intracontinental closed lakes are unique natural archives of the regional environment and climate changes. The aim of this work is to study the processes of sedimentation in two neighboring lakes of different mineralization (Lake Sulfatnoe and Lake Krugloe) located within the Gusinoozerskaya depression in Western Transbaikalia, a comparative analysis of authigenic components, determination of their mineralogical and crystallochemical features. Sediment samples have been analyzed by several methods: powder X-ray diffractometry (XRD), IR spectroscopy, electron microscopy, laser diffraction particle size analysis, elemental analysis, etc. It is shown that the formation of authigenic carbonates occurs in shallow mineral lakes of Transbaikalia. It was established that in the sediments of the lake. Sulphate carbonates make up to 25 % of the mineral composition, and in the sediments of the lake. Round – the first percent at the top of the cut. This difference is due to different hydrogeological regime of lakes and chemical composition of water. By the mathematical modeling of complex XRD patterns of lacustrine sediments, Mg-calcites with different Mg contents and excess-Ca dolomites have been determined in the assemblage of authigenic carbonate minerals. The existing viewpoints on the structure of low-temperature carbonates of the calcite-dolomite series and their formation conditions in lacustrine sediments are considered. It is established that the number and proportion of phases with different Mg contents are determined by the Mg/Ca ratio, salinity, total alkalinity and other chemical parameters of water controlled by climate and lake level changes
Key words mineral formation; carbonates; bottom sediments; shallow lakes; XRD analysis; IR spectroscopy; modeling; Holocene; climate; Western Transbaikalia
Article information Solotchin P., Solotchina E., Sklyarov E., Strakhovenko V., Zhdanova A., Danilenko I. Authigenic carbonate formation in shallow lacustrine basins of Western Transbaikalia // Transbaikal State University Journal, 2018, vol. 24, no. 6, pp. 45-54
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Full articleAuthigenic carbonate formation in shallow lacustrine basins of Western Transbaikalia