石人嶂钨矿床放射性矿物的赋存状态及成分特征

Occurrence and Composition Characteristics of Radioactive Minerals in Shirenzhang Tungsten Deposit

石人嶂钨矿床中石英钨矿脉、花岗岩和变质岩中均发现有一定量的放射性矿物,经显微镜下鉴定初步确定为晶质铀矿、钍石、方钍石,部分与黄铁矿连生或被黄铁矿包围构成环边,部分以自形晶与独居石、锆石、钛铁矿、磁铁矿、磷钇矿等副矿物共生,有些还受力破碎错位。对所发现矿物进行扫描电镜能谱分析,其中晶质铀矿含量(wB)UO386.38%～100%,ThO20～11.88%;而锆石除含SiO2(28.76%～33.49%)、ZrO2(58.11%～67.28%)和HfO2(0.25%～5.24%)外,还含少量UO3(0～5.05%)。

Some radioactive minerals are found in quartz tungsten vein, granite and metamorphic rocks in Shirenzhang tungsten deposit. According to microscope analysis, there are uraninite, thorite and thorianite. Part of the intergrown surrounded by pyrite is euhedral crystal with minerals as monazite, zircon, ilmenite, mag- netite and xenotime. Some of them are broken and dislocated by force. By analysis of scanning electron micros- copy and energy dispersive spectrum, the crystalloid uranium contains UO3 86. 38% - 100%, ThO2 0 - 11.88%. The zircon contains UO3 0-5.05% besides SiO2 （28.76% -33.49%）, ZrO2 （58. 11% - 67.28% ） and HfO2 （0. 25% -5.24% ）.