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金矿成因类型甚多,隶属正长岩者国内外报道较少。近年来,在滇西某地进行重砂异常检查,于正长岩中发现了原生金矿化。正长岩体呈群出露于三江褶皱系义敦褶皱带南端的乡城断裂与次级断裂交汇处,与上三叠统(T_3~1)砂板岩呈侵入接触。附近见有上二叠统、中三叠统幔源型玄武岩分布。岩群由17个岩体(脉)组成,分布在8平方公里内。出露面积最大者0.4平方公里,最小者10平方米。岩体一般剥蚀较浅,个别剥蚀较深者相带齐全,且金矿化较强。
There are many types of gold deposits, and few are reported at home and abroad. In recent years, heavy sand anomalies have been inspected in a certain place in western Yunnan, and primary gold mineralization has been found in the syenite. The syenite body is exposed in the intersection of the Xiangcheng fault and the secondary fault at the southern end of the Yintun fold belt of the Sanjiang fold system and intruded into contact with the sandstone of the T_3 ~ 1. Near the Upper Permian, the Middle Triassic mantle-derived basalt distribution. The rock mass is composed of 17 rock mass (vein), distributed in 8 square kilometers. Out of the largest area of 0.4 square kilometers, the smallest 10 square meters. Generally, the denudation of the rock mass is shallow, and some of the denuded ones are quite complete with strong gold mineralization.