Инд. авторы:	Strakhovenko V.D., Gas'kova O.L.
Заглавие:	Thermodynamic model of formation of carbonates and uranium mineral phases in lakes Namshi-Nur and Tsagan-Tyrm (Cisbaikalia)
Библ. ссылка:	Strakhovenko V.D., Gas'kova O.L. Thermodynamic model of formation of carbonates and uranium mineral phases in lakes Namshi-Nur and Tsagan-Tyrm (Cisbaikalia) // Russian Geology and Geophysics. - 2018. - Vol.59. - Iss. 4. - P.374-385. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы:	DOI: 10.1016/j.rgg.2017.05.002; SCOPUS: 2-s2.0-85045392440; WoS: 000429910700004;
Реферат:	eng: The Tazheran lakes are located compactly in the small Tazheran steppe area. Their bottom sediments are predominantly various calcite-dolomite carbonates, and their waters are rich in uranium. The studies have shown that the main process in these lakes is chemogenic carbonate precipitation with the participation of carbon dioxide formed through the bacterial destruction of organic matter. For thermodynamic modeling of the composition of bottom sediments, we chose two lakes with different basic parameters. Calculations were made for the 15-component heterogeneous system H2O-Na-Ca-Mg-K-Sr-Ba-Si-Al-Cl-C-S-Fe-U-Mn including particles in the solution, minerals, and gases at 25 degrees C and 1 bar. As starting information, we used the obtained analytical data on the natural composition of waters and bottom sediments. The results show that calcite-dolomite carbonates are predominant in the bottom sediments and the destruction of organic matter results in reducing conditions. This confirms the hypothesis of the formation of mineral phases of U( IV) during diagenetic processes in the bottom sediments of the studied lakes. (C) 2018, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.
Ключевые слова:	RADIONUCLIDES; BIOREMEDIATION; BEHAVIOR; REDUCTION; BAIKAL REGION; BOTTOM SEDIMENTS; SEDIMENTARY RECORD; OLKHON REGION; SULFATE-REDUCING CONDITIONS; Cisbaikalia; thermodynamic modeling; mineral phases of uranium; mineralogy and geochemistry of authigenic carbonates; bottom deposits of lakes; SIMULATION;
Издано:	2018
Физ. характеристика:	с.374-385