Abstract
Small lakes located compactlyon small territories in the steppe landscape of different regions of Siberia have been studied. High uranium contents in waters of lakes of sodium bicarbonate composition with high alkalinity, as well as increased concentrations of uranium in the bottom sediments of some lakes were revealed. It has been determined that carbonates are deposited in these lakes against the background of the predominant terrigenous fraction (quartz, feldspars) as a result of chemogenic and biogenic processes with the participation of carbon dioxide gas, which is formed due to the bacterial destruction of organic matter. Сalcite-dolomite carbonates are shown to be predominated in the bottom sediments, and reducing conditions are created due to the destruction of organic matter. During the carbonate crystallization the U sorption occurs by newly formed minerals.
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