The role of contact metamorphism in the formation of uranium mineralization

Mechanisms of substance migrations in zones of contact metamorphism and main regularities in uranium deposit formation under these conditions are considered on the basis of quantitative petrochemical, radiogeochemical and thermobaric data. A geochemical model of these processes is suggested. The developed model of uranium mineralization is determined by storage of primary potential uranium reserves in the course of earlier geological history, by its transition to potential-mobile form, by appearance of the aureole of highly compact aquatic-carbonic acid fluid, by alteration of physico-mechanical properties of rocks in the progressive phase of contact metamorphism, by combination of further thermal and tectonic history of the development of the given area in the regressive phase. Each of these factors can be realized by different geological processes and with different intensity, but only their successful coincidence results in formation of large deposits