云南江城大团包铜矿区构造-蚀变-地球化学综合方法找矿研究

Comprehensive Structure-Alteration-Geochemistry Prospecting of the Datuanbao Copper Mining Area in Jiangcheng,Yunnan

运用成矿构造学分析、构造蚀变带填图和构造地球化学测量方法对产于滇中中生代红层地区的大团包铜矿区进行了综合方法找矿研究,并取得了以下认识:矿区成矿构造具有多期活动性,北东、北西断裂均为矿区有利的控矿构造,二者交汇部位是成矿有利的部位。4号勘探线是矿区的矿化中心,北东向构造矿化具明显的不均一性,以往仅局限于北东向构造找矿的认识是不全面的。围岩硅化和褪色化是一种特征的找矿标志,构造蚀变带填图应用于中生代红层地区经济快捷,富有成效。成矿构造分析着眼于成矿的空间问题和驱动力,构造蚀变带填图着眼于成矿过程中矿物岩石成分的变化,构造地球化学着眼于成矿过程中化学成分的变化,三者各具特色、互为补充、相互印证。根据综合方法找矿的研究成果,提出了三个可供工程验证的找矿靶区,即:4号勘探线的深部;F5断层及其与长冲菁断层(F2)的交汇部位;F1断层及其与长冲菁断层(F2)的交汇部位。

Metallogenic structure analysis,structural alteration zone mapping and tectonic geochemistry survey were conducted in the Datuanbao copper mine area which is situated in the Mesozoic redbed area in central Yunnan. It is concluded that the metallogenic structure in the mining area is characterized by multistage activity,within which NE and NW faults are favorable ore-controlling structures in the mining area,while the intersection parts are plausible for ore formation. No.4 prospecting line is the center of the ore deposit. NE-trending structure-mineralization is obviously heterogeneous and the prospecting should not be limited to the NE-trending faults. Wallrock alteration and decoloration are good prospecting indicators,whereas structural alteration zone mapping in the Mesozoic redbed area is a fast and economically significant way of ore expecting. Metallogenic structure with a view to space problem and driving force of metallogenic,structural alteration zone mapping with a view to the change of minerals and rocks composition in ore-forming processes,tectonic geochemistry with a view to the change of chemical constituents in ore-forming process,each has its own characteristics and they are complementary. By using comprehensive prospecting method,three prospecting targets are given: the deep of No.4 exploration line,the intersection part of F5 fault and F2 fault,the intersection part of F1 fault and F2 fault.