Geological comparison between east European and Canadian uranium deposits

The comparison of some geological features between the Canadian and East European (including the Asian part of U. S.S. R.) uranium deposits and types of deposits show many similarities, e.g. the deposits were formed during analogous mineragenetic processes, they were related to certain orogenies and to certain phases of the tectonic cycles in specific geological conditions . The distribution of the endogenetic uranium deposits is structurally controlled by regional deep fault and fracture systems, along which the tectonic movements were repeated several times. The intersections and ramifications of such systems are the favourable loci for uranium deposits, if other favourable conditions are pre sent. Favourable lithological features of sedimentary rocks within the uranium-bearing areas and provinces influenced the localization of uranium mineralization in the sedimentary syngenetic deposits or in the epigenetic deposits in sediments. The syngeneic differentiation and accumulation of uranium caused the primary enrichment of rocks with uranium. Weathering processes, which affected the uranium enriched rocks, separated the uranium compounds and introduced them either as a part of weathered material into the detritus or into the hydrological cycle. Metamorphic processes an ls o participated in differentiation and accumulation of uranium. Comparison of some geological features of uranium deposits from different geological environments as well as the hitherto published classifications of uranium deposits allowed a new classification of uranium deposits into several syngeneic, metamorphic and epigenetic groups and various types within them.