【作者】 李平； 张子龙； 刘红旭； 贺锋；

【Author】 LI Ping;ZHANG Zi-long;LIU Hong-xu;HE Feng;Beijing Research Institute of Uranium Geology;

【机构】 核工业北京地质研究院；

【摘要】 通过鄂尔多斯盆地南部店头地区含矿砂岩的普通薄片观察和电子探针分析,对研究区直罗组下段含矿砂岩矿物的生成顺序进行了较全面的研究,探讨了矿物的生成顺序与铀成矿的关系。研究认为:研究区的主要铀矿物为铀石,以颗粒状分布于黄铁矿边缘和以细分散状均匀分布于胶结物地沥青中,黄铁矿—地沥青—铀石—方解石胶结物-伊蒙混层的形成顺序为草莓状黄铁矿—伊蒙混层—方解石—立方体状黄铁矿—铀石—地沥青—铀石。该过程说明铀石的形成分两期,一期与黄铁矿的还原作用相关,另一期与地沥青的来源相关。更多还原

【Abstract】 The Diantou sandstone type uranium deposit is another important deposit in Ordos basin besides the Dongsheng uranium deposit.By such means as general slice and electron microprobes,the authors conducted a comprehensive analysis of the mineral arisen sequence of mineral bearing sandstone of Zhiluo Formation and on such a basis discussed the relationship between the mineral arisen sequence and uranium mineralization.The results show that the mineral arisen sequence of the Zhiluo Formation down stage sandstone is pyrite framboids→the mixed-layer minerals of illite and smecile→calcite→cubic pyrite→coffinite→land-bitumen→coffinite.Coffinite has two forms of output:fine particle distributed in the edge of cubic pyrite and disperse states distributed in the land-bitumen cement.The sandstone type uranium deposit was related to the reduction of pyrite and the sources of land-bitumen.更多还原