十红滩铀矿床有机地球化学特征及与铀成矿作用

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 Organic Geochemistry Characteristic Simple Analyse of Shihongtan Sandstone-type Uranium Deposit in Turpan-Hami Basin(In Chinese)

The Shihongtan uranium deposit in Turpan-Hami basin is an interlayer oxi- dized zone type sandstone uranium deposit.The deposit occurs in the coal-bear- ing detrital rocks of braided meandering steam facies in the Middle Jurassic Xis- hanyao formation.There is a great deal of organic matter in the ore-hosting bed.There is distinct content of organic carbon,soluble organic matter,acidol- ysis hydrocarbon in various geochemistry belt rock,and the maximum content in the ore belt.Organics carbon mother-material type is sapropelic humus,or- ganic matter is under mature stage,Aeidolysis hydrocarbon is coal-gas type.U- ranium content in rock is positive correlativity to soluble organics and acidolysis hydrocarbon by statistical count.The role of organic matter in sandstone type uranium metallogenetic process is analysed,it is thought that material decom- posed under oxygenic codition is advantage to uranium dissolution and migration in groundwater,material decomposed and polymerized under oxygen-deficient condition forms reducing and adsorption geochemistry barrier for uranium pre- cipitation,play a important role in uranium metallogenetic process.