塔木素铀矿床含铀黄铁矿特征及铀成矿过程探讨

Characteristics of Uraniferous Pyrite and Metallogenic Process of Tamusu Uranium Deposit

塔木素铀矿床位于内蒙古巴音戈壁盆地西南部,是一个扇三角洲砂岩型铀矿床。黄铁矿是该矿床中一个主要的贯通性矿物,文章通过黄铁矿的分布、矿石组构和矿物共生组合特征,结合显微镜下观察,厘定出4个世代黄铁矿,然后通过电子探针分析,查明了黄铁矿的化学组成,通过黄铁矿中硫同位素分析,认为黄铁矿成因为细菌硫酸盐还原作用所致。最后讨论了Th、Ni、Re和Y元素与U的相关性。基于上述研究成果,建立了塔木素含铀砂体中黄铁矿的形成与演化模式,并讨论了塔木素铀矿床的成矿过程。

Tamusu uranium deposit is located in the southwest of Bayingebi basin,Inner Mongolia,which is sandstone type uranium deposit in fan delta sediments.Pyrite is a major mineral occurred in the whole metallogenic process.By studying the distribution and the fabric of pyrite and mineral assemblages with the microscope,four generations of pyrite was recognized and its chemical composition was identified by electron microprobe analysis.isotope analysis suggested the pyrite was the product of sulfate-reducing bacteria effect.The correlation between U and Th,Ni,Re and Y elements was also discussed.Based on the above research results,the formation and evolution model of pyrite in uranium host sand body was established,and the metallogenic process of Tamusu uranium deposit was discussed.