SULFATE MINERAL LAKES OF WESTERN TRANSBAIKALIA: FORMATION CONDITIONS, CHEMICAL COMPOSITION OF WATERS AND BOTTOM SEDIMENTS
A.M. Plyusnin1,2, Z.I. Khazheeva1, S.S. Sanzhanova1, E.G. Peryazeva1, N.A. Angakhaeva1
1Geological Institute, Siberian Branch of the Russian Academy of Sciences, ul. Sakh’yanovoi 6a, Ulan Ude, 670047, Russia
2East Siberia State University of Technology and Management, ul. Klyuchevskaya 40V, str. 1, Ulan-Ude, 670013, Russia
Keywords: Mineral lakes, evaporation, freezing-out, sulfate ion, trace elements, REE, isotope composition, bottom sediments
Abstract
The paper discusses the formation of the chemical composition of water in the sulfate mineral lakes of western Transbaikalia. It is shown that sodium sulfate water in the regional lakes forms in two zones of continental salinization, the Barguzin and Gusinoe Ozero-Orongoi depressions. The average mineralization of the lakes reaches 30.8 g/L, pH = 7.90-8.84, the fractional content of sulfate ion is 55.2-81.8 % eq, and the fractional content of sodium ion is 59.1-82.1 % eq. The paper presents the major-ion and trace-element composition of lake waters and the chemical and mineral composition of bottom sediments. It is shown that groundwater enriched in sodium sulfate plays a major role in the lake formation.
DOI: 10.15372/RGG2019154
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