METALOGENY OF URANIUM IN THE PHANEROZOIC OF THE PLATFORM PART OF UKRAINE

Abstract

Numerous deposits, ore deposits and mineral uranium anomalies are known in the territory of the development of platform Phanerozoic formations in Ukraine. According to the conditions of their formation, metallogenic epochs were isolated and structural-metallogenic zon-ing of the territory was carried out. It is established that the formation of the Phanerozoic platform cover was accompanied by the accumu-lation and redistribution of uranium in it in several stages, which were characterized by participation in of both exogenous and endoge-nous processes. Epigenetic processes perform a leading role in the formation of uranium ore deposits in Phanerozoic sedimentary for-mations. The general principle of exogenous uranium ore formation is the combination of the ore process with the stages of lithogenesis of the rocks containing them. Each genetic type of uranium deposits in sedimentary strata is characterized by a specific epigenetic mineralog-ical-geochemical zonation. Uranium occurrence is always confined to a particular zone and is generally a part of that zonation, which is a typomorphic feature and a major search criterion. Ascending low-temperature or thermal carbon-dioxide-hydrocarbon chloride solutions of deep (metamorphic or metagenetic) origin, which were diluted with underground meteors by the end of ore formation, were involved in the formation of polygenic deposits and ore occurrence of Uranium of the Cimmerian era. The Don-Dnipro structural-metallogenic zone is characterized by the presence of exogenous uranium deposits of the reservoir-infiltration subclass and polygenic exfiltration deposits. Tho-rium-uranium, uranium-coal and uranium-bitumen deposits in the Phanerozoic platform formations are known in the area. Uranium sub-sidence is accompanied by concentrations (often ore) of other metals.

Keywords

• uranium
• ukrainian shield
• metallogenic epochs
• sedimentary cover
• hydrogen deposits