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十红滩铀矿床属层间氧化带砂岩型铀矿床,赋存于中侏罗统西山窑组含煤碎屑岩中。容矿层岩石中富含有机质,有机碳、可溶有机物、酸解吸附烃在不同地球化学分带的岩石中含量大小不同,尤以氧化还原过渡带含量最高。矿石有机质母质类型为腐殖型,处于未成熟演化阶段,酸解吸附烃为煤成气型。统计计算表明:容矿层中铀和可溶有机物、酸解吸附烃含量之间具明显的相关关系。分析了有机质在砂岩型铀矿床形成过程中的作用,认为容矿层中有机质在含氧环境下分解的产物利于铀在水中的溶解和迁移,而在缺氧条件下分解的产物,构成铀沉淀的还原和吸附地球化学障,在铀的成矿过程中发挥重要的作用。
The Shihongtan uranium deposit is an interlayer oxidation zone sandstone-type uranium deposit and occurs in the coal-bearing clastic rocks of the Xishayao Formation in the Middle Jurassic. The content of organic matter, organic carbon and soluble organic matter in the rock of ore-bearing layer is rich. The contents of acid-desorbing hydrocarbon in rock with different geochemical zoning are different, especially in the redox transition zone. The organic type of ore organic matter is humic type, which is in immature evolution stage, and the acid desorbing hydrocarbon is coal gas type. Statistical calculations show that there is a clear correlation between uranium, soluble organic matter and acid desorbed hydrocarbon content in the ore body. The role of organic matter in the formation of sandstone-type uranium deposits is analyzed. It is considered that the products of organic matter in the ore-bearing layer decompose in the oxygen-containing environment are beneficial to the dissolution and migration of uranium in water, while the products decomposed under anaerobic conditions form uranium precipitation The reduction and adsorption of geochemical barriers play an important role in the mineralization of uranium.