滇东南老君山南捞铜钨矿床地质特征及成因探讨

Geological Characteristics and Genesis of the Nanlao Cu-W Deposit in Laojunshan Area,Southeastern Yunnan Province

南捞铜钨矿床是老君山花岗岩体北西翼外接触带新发现的一个矿床,探明铜钨资源储量均达到小型规模。铜钨矿化部位主要位于剥离断层附近的新寨岩组(Pt_(3)x)片岩与南捞片麻岩(Ngn)之间,赋矿围岩普遍发生硅化、矽卡岩化蚀变。通过成矿地质背景和矿床地质-地球化学特征研究,表明该矿床具有多因素复合控矿、成矿物质具有多来源的特征,初步总结了矿床成因,认为该矿床与区内多期次构造-岩浆活动有关,并指出了本区下一步的找矿方向。

The Nanlao Cu-W deposit,a newly-discovered ore deposit,is located in the northwestern periphery of the Laojunshan granite body.Its proved Cu and W reserves have reached the middle scale,as evidenced by recent exploration.The Cu and W mineralization occurs near the interbedded detachment faults between Xinzhai Formation and Nanlao gneiss.The ore bodies are mainly hosted in the wall rocks which experienced alterations such as silicification and skarnization.The geological and geochemical characteristics of the ore deposit suggest that the mineralization of the ore deposit was mainly controlled by Yanshanian granites,strata and detachment faults,and the ore-forming materials might have been mainly derived from Yanshanian and Caledonian granites.It is held that the formation of this ore deposit was related to the multiphase tectonism-magmatism.In addition,the ore-prospecting direction in Laojunshan area is pointed out in this paper.