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

Gejia Pb-Zn poly-metallic 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-metallic ore deposit by contact metasomatic effect. Wall rock alteration in this area is the important sign for prospecting.