Tectonic metallogenesis of uranium and its time-space evolution in uranium metallogenic provinces of south China

The paper discusses grade-sequences and clusters of linear structures and ore-concentrating structures controlling uranium mineralization. Time-space evolutional model of uranium in metalogenic provinces is suggested. The time-bound interval of uranium commercial concentration is about 35 Ma. It is just in the transitional period between two tectonic episodes of Yanshanian and Himalayan tectonic cycles respectively, and it is consistent with maximum mobility period and residual mobility period of the Diwa stage. Economic concentration of uranium took place in Mesozoic period which was a relatively stable period for the continental crust changing from the stage of compression into tension under the action of plate tectonics. With the strong tectonic reactivation in Mesozoic and Cenozoic period, uranium was further increased in the tectonic-geochemical environments of uranium-rich strata (body). Under the mutual action of various uranium sources, fluid sources and heat sources, uranium in the particular tectono-geochemical barriers was enriched and uranium deposits were formed