相山矿田热液水云母化及其与铀矿化关系研究

RELATIONSHIP BETWEEN HYDROMICATIZATION AND URANIUM MINERALIZATION IN THE XIANGSHAN OREFIELD

相山铀矿田广泛发育热液水云母化 ,且水云母以伊利石、蒙皂石混层矿物居多。对典型矿床围岩、蚀变岩石和矿石中粘土组成的定量分析和化学成分分析表明 :随着 U元素的逐渐富集 ,粘土矿物存在蒙皂石→伊利石、蒙皂石混层矿物→伊利石的转化过程 ,而且这一转化过程在本区是一个动态的平衡过程 ,这一研究结果很好解释了相山矿田以群脉型矿床为主的特征 ;蚀变岩石中高蒙皂石含量的粘土矿物为后期形成富大铀矿起了富集 U的作用。

The Xiangshan uranium orefield in Jiangxi Province is the largest volcanogenic hydrothermal uranium orefield in China.There are more than twenty uranium deposits in this area.Hydromicatization is the basic and important alteration in the Xiangshan orefield.X\|ray diffraction quantitative identification of clay minerals shows that the transformation from smectite to illite accompanied the uranium mineralization,and illite/smectite mixed\|layer minerals concentrated uranium for further uranium precipitation.The transformation process from smectite to I/S to illite is a dynamic equilibrium process.The termination of transformation from smectite to illite in I/S mixed\|layer minerals accounts for the fact that the Xiangshan uranium orefield is characterized by vein deposits.