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THE EVOLUTION OF HYDROTHERMAL-METASOMATIC URANIUM PROCESSES IN THE HISTORY OF GEOLOGICAL DEVELOPMENT OF THE CHARSKY AREA

Гребенкин Н.А.
We studied uraniferous hydrothermal-metasomatic rocks that were forming the long geological history of the Charsky area. Uranium-bearing silica alkaline metasomatites with uraninite, monazite and xenotime were formed in the early Proterozoic. Processes of diaphthoresis (R1-2) and metasomatosis of acid type (R2-3) existed in the Riphean era. These processes were accompanied with uranium-phosphoric and uranium-sulfide mineralization. Mesozoic time was characterized by formation of pyrite-carbonate-feldspar hydrothermal gold-contained alterations of the rocks and pyrite-carbonate-koffinit vein (J2). Fenites, vein-type and breccias with thorium and uranium mineralization were formed later than pyrite-carbonate-feldspar hydrothermal rock alterations (J3-K1). It is shown that the main perspectives identify industrial uranium deposits in the Charsky area are associated with Late Riphean activation. This period is characterized by uraniferous metasomatic rocks of acid type.