准噶尔盆地东部喀木斯特地区砂岩型铀矿目的层岩石学特征及其意义

Lithology characteristics and meaning of the target layer of sandstone-type uranium deposits in Kamusite area of the eastern Junggar basin

准噶尔盆地是我国重要的能源勘查基地,其铀资源勘查一直难以突破。通过对准东喀木斯特地区煤田资料的"二次开发",进而择优开展钻探验证,发现了工业铀矿体。中侏罗统头屯河组是该区的含矿目的层位,具有十分良好的找矿前景和研究意义。为了深入了解该区目的层砂体的岩石学特征及铀成矿作用,通过详细的野外地质调查、钻孔岩心观察等方法,利用实验室分析测试技术,结合室内地质工作和前人已有成果,研究了该区砂岩的碎屑成分特征、蚀变作用及成岩作用等岩石学特征,并对其铀矿物成分及后生铀成矿作用进行了探索。结果表明,该区砂岩成岩作用较强,主要铀矿物类型为铀石、钛铀矿,具备发育铀储层的良好条件,铀矿化作用较好,找矿远景好。

Junggar basin is an important energy exploration base in China.The exploration of its uranium resources has been difficult to break through.By secondary development of the coal exploration results of Kamusite area in eastern Junggar basin,further drilling verification,industrial uranium orebodies have been found.The Middle Jurassic Toutunhe Formation is the ore-bearing target in this area,has very good prospecting prospect and research significance.In order to understand the petrological characteristics and uranium mineralization of the target-layer sand body in this area,through the detailed field geological survey,borehole observation and other methods,with the advanced analysis and testing technology,combined with the interior geology work and previous achievements,the characteristics of clastic compositions,alteration and diagenesis of sandstone in this area were studied.And the composition of uranium ore and the mineralization of epigenetic uranium were studied.The results show that sandstone diagenesis is strong in this area,has good conditions for developing uranium reservoirs,and the uranium mineralization is better,the main uranium ore types are coffinite and brannerite.