Formation OF THE CHEMICAL COMPOSITION OF BRACKISH AND BRINE GROUNDWATER IN THE TUVA DEPRESSION AND SURROUNDING AREAS
N.V. Guseva1, Yu. G. Kopylova1, Ch.K. Oidup2, K.D. Arakchaa3, K.M. Rychkova2, A.A. Khvashchevskaya1, O.D. Ayunova2
1National Research Tomsk Polytechnic University, pr. Lenina 30, Tomsk, 634050, Russia
2Tuva Institute of Comprehensive Exploration of Natural Resources, Siberian Branch of the Russian Academy of Sciences, ul. Internatsional'naya 117a, Kyzyl, 667007, Russia
3Research Institute of Medical and Social Problems and Management of the Tuva Republic, ul. Lenina 48, Kyzyl, 667000, Russia
Keywords: Солоноватые воды, химический состав, континентальное засоление, окисление, система вода, порода, Тувинский прогиб, Brackish waters, chemical composition, continental salinization, oxidation, water-rock system, Tuva depression
Abstract
Groundwater with high salinity is widespread in different climatic and geologic environments of the world. The formation of its chemical composition, however, is still debatable. The chemical composition of groundwater has been studied in 19 springs of the Tuva depression. In this area, hydrocarbonate, sulfate, and chloride waters with different cation compositions discharge. Their TDS value varies mainly from 1 to 6 g/L, reaching 315 g/L at only one point. The chemical composition of the studied waters is reflective of the geostructural, hydrogeologic, landscape, and geochemical conditions. The main processes determining the chemical composition of the waters are their interaction with aluminosilicate minerals, dissolution of gypsum and halite, evaporation, and oxidation of sulfide minerals.
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