The Correlation between Sandstone Uranium Ore-Body and the Coal Bed in Jurassic System, Dongsheng, Inner Mongolia
摘要
Much more attention has been paid to the relationship of the metallogenesis and the organics accumulation formation.The relationship between the uranium ore-body in sandstone and the coal bed in Dongsheng uranium ore district,Ordos Basin,is still unknown.According to many years of exploration,the paper suggests that the plan location of the uranium ore-body is overlapping or near that of the coal bed in Dongsheng uranium ore district.There are coal beds over or under the uranium ore-body in the section,and the vertical distance between them is 2-15m.The depth changes of the uranium ore-body respond well to that of the coal beds,and there are some inner relationships between the uranium ore-body and the coal bed.The acidolysis hydrocarbon from the uranium-bearing bed is CH4,the same as that in the coal bed gas.The mean content of the acidolysis hydrocarbon is 569.43 μ L / kg in the uranium ore,174.93 μ L / kg in the uranium-bearing sandstone and 156.12 μ L / kg in non-uranium sandstone.The coal bed,especially the coal bed gas,is an important reductant during the uranium mineralization in Dongsheng uranium-bearing bed,and the coal bed and its depth changes may serve as exploration indicators for the sandstone-type of uranium deposits.