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—For uranium deposits to form from oxidizing waters of surface origin, it is necessary to combine several conditions and processes of different ranks that make up a specific mineral system. Analysis of exogenic deposits of different scales and ore quality from different regions of the world showed that, among all the critical processes necessary for the formation of large deposits and vast provinces, global tectonic movements play a particular role. A geodynamic regime with moderate vertical differentiation of crustal blocks is most favorable for development of a hydrodynamic infiltration ore-forming system under near-surface conditions. An infiltration artesian system is capable of functioning for millions and tens of millions of years, which makes it possible to accumulate large uranium reserves at the geochemical reduction barrier. The required regime is typical of regions with a certain geotectonic position. For example, the peripheral regions of orogenic belts along tectonic plate boundaries, as well as the frames of some long-lived intraplate deep faults. In the same regions, the proximity of infiltration and expulsion hydrodynamic systems is possible. In local areas where groundwater of various origin and composition interact, conditions occur for particularly efficient uranium concentration in ores. Limitations on the productivity of a hydrodynamic infiltration ore-forming system are imposed by historical factors that predetermine the formation of the uranium source and lithological conditions for ore localization, as well as the climatic conditions of the time in which the system functioned and postore conditions determining the preservation of mineralization accumulated in the system. The revealed patterns be used to predict ancient provinces of exogenic uranium deposits.

Special Conditions for the Formation of Large Exogenic Epigenetic Uranium Deposits