华南产铀花岗岩蚀变矿物绿泥石与铀成矿的联系

The Relationship Between Chlorite and Uranium Mineralization of Granites in South China

选取了花岗岩中最为常见的蚀变矿物绿泥石作为研究对象,通过绿泥石的成分、种类来总结产铀花岗岩中的绿泥石所具有的特征。产铀花岗岩绿泥石种类复杂,包括铁绿泥石、铁镁绿泥石、磷绿泥石、鲕绿泥石、铁叶绿泥石和辉绿泥石,其MgO含量较低、FeO和Fe_2O_3含量较高。绿泥石组成显示产铀花岗岩形成于泥质岩源区,其源岩更加富铀。产铀花岗岩的绿泥石四面体和八面体的位置成分复杂。产铀花岗岩的绿泥石形成温度略高,在低氧逸度的环境下形成。

Chlorite as the most common alteration mineral in South China granites. This article researched chlorite and concluded the characteristics of the chlorites in uranium-deposit-bearing granites（ UDG）. The types of the chlorites in UDG are complex,including daphnite,brunsvigite,thuringite,chamosite,euralite,and diabantite.The chlorites in UDG display low MgO,high FeO,and Fe2O3 contents. According to the composition of chlorite,the UDG are derived from a high U contents pelite-source. The sites compositions of the tetrahedral and octahedron of chlorites in UDG are complex. And the chlorites in UDG form under high-temperature and the low-fO2 environment.