云南省个旧市戈贾铅锌多金属矿床地质特征及找矿标志

Geological Features and Prospecting Criteria of Gejia Pb-Zn Polymetallic Ore Deposit in Gejiu County of Yunnan Province

个旧戈贾铅锌多金属矿位于青、藏、滇、缅超巨型反"S"型构造体系,川滇南北构造和南岭东西复杂构造带西缘地区的交接地带。通过野外调研和室内工作,认为该铅锌多金属矿床具有如下地质特征:该矿床的矿体多赋存于中三叠统法郎组的层间破碎带中,矿体一般呈层状、似层状产出;仙人洞断裂是该矿区主要的控矿断裂,层间破碎带是该矿区的容矿构造,"断层加互层","断层扎根"也是矿化富集的场所;花岗岩与成矿关系极为密切。该矿床属由岩浆热液充填及接触交代作用所形成的铅锌多金属矿床。区内围岩蚀变强烈,是找矿重要标志。

Oejia Pb-Zn poly-metailic ore deposit is in one colossal ＂reverse-stype＂ tectonic system located at Qinghai Tibet Yunnan and Burma areas. It is a transition zone for south-north tectonic zone in Sichuan and Yunnan areas and west edge of EW structure belt in Nanling area. The Pb-Zn ore deposit is supposed to such geologic features through field investigation and office work： the ore deposit is discovered at ruptured zone in Falang formation of middle Triassic and basically concordant to the beddings of the confining strata. Xianrendong fracture is the ore-controlled fracture in this area and the ruptured zone is ore-hosting structures. Fault and interbedding＂ and heavily faulted area is also mineralized zone. Granite is closely related to metallogenic. Through the analysis of the research the ore deposit is deemed to be one magmatic-hydrothermal filling Pb-Zn poly-metallie ore deposit by contact metasomatie effect; Wall rock alteration in this area is the important sign for prospecting.