1地质背景桂东地区处于桂东—粤西金地球化学省西缘,金银矿化普遍,在广西占有重要的地位。大地构造位于华南地槽系西南部,属南岭纬向构造带南亚带的一部分,经历了地槽、准地台和大陆边缘活动带3个地史发展阶段(陈开礼,2001)。区内地层出露较全,有板溪群、震旦系、寒武系、奥陶 1 Geological Background Guidong area is in the western margin of Guidong-western Guangdong Geochemical Province, where gold and silver mineralization is widespread and occupies an important position in Guangxi. The earth structure is located in the southwestern part of the South China Slot Trough and belongs to the South Belt of the Nanling Zonal Structure Belt. It has undergone three stages of the development of the Earth’s geodetic terraces, quasi-terraces and continental marginal zones (Chen et al., 2001). The strata in the area are more exposed, with Banxi Group, Sinian, Cambrian and Ordovician