我国砂岩型铀矿成矿构造研究现状及发展趋势OA

[Objective]The traditional theory of sandstone-type uranium mineralization has limitations in understanding the role of tectonics in mineralization.However,the distribution and occurrence characteristics of sandstone-type uranium deposits in China are significantly controlled by tectonics.To deeply analyze the constraining mechanism of tectonic elements on the uranium mineralization process,we systematically study the mineralization characteristics of the main sandstone-type uranium deposit clusters in China,aiming to reveal the different manifestations and causes of uranium mineralization under different tectonic backgrounds.[Method]By conducting a comprehensive comparative analysis of the mineralization characteristics of typical sandstone-type uranium deposit clusters in Northwest,North Central and Northeast China,and combining the mineralization dynamic background,the coupling relationship between tectonics,fluids,and mineralization is explored.[Results]The study shows that uranium mineralization in Northwest China is concentrated in the foreland basins of compressive orogenic belts,forming typical interlayer oxidation zone-type uranium deposits;in North Central China,it exhibits complex mineralization characteristics closely related to strike-slip fault systems;uranium mineralization in Northeast China is mainly controlled by the extensional tectonic regime,with the development of deep thermal fluid superimposed and remodeled uranium mineralization.Deep fluids migrate along fault systems and alter the geochemical environment of ore-bearing layers,promoting the accumulation of uranium in favorable tectonic positions;neotectonic movements,through the reactivation of faults and differential uplift of basins,not only transform pre-existing mineralization bodies but also form complex features of multi-stage fluid superimposed mineralization.[Conclusion]The coupling mechanism of tectonics,fluids,and mineralization is the key to understanding the mineralization laws of sandstone-type uranium deposits.It is suggested that in the future,efforts should be focused on constructing a coupling model of tectonics,fluids,and mineralization,and strengthening the application of deep exploration prediction technologies to provide theoretical and technical support for expanding the exploration of uranium resources.