云南维西县格坡洛锑矿床构造控矿规律

Tectonic ore-controlling regularity of Gepoluo antimony deposit in Weixi County,Yunnan

格坡洛锑矿是西南三江成矿带中南段与花岗斑岩有关的热液型锑矿床,矿体产于喜马拉雅期阿南多塘花岗斑岩体内、外接触带的压扭性断裂破碎带中,严格受断裂构造控制。经野外地质调查及构造研究认为,矿区存在四期活动断裂,具有不同的控矿特点:NNW向的攀天阁深大断裂位于矿区东部,是阿南多塘花岗斑岩体的边界断裂,是最早活动断裂,为矿区容矿构造之一;第二期活动断裂为NE向断裂,主体发育于阿南多塘花岗斑岩体内,是矿区最主要的容矿构造;NW向断裂为第三期断裂,是矿区主要导矿构造及容矿构造;近EW向断裂切割了NW、NE向断裂,为最晚期活动的破矿构造。

Gepoluo antimony deposit is a hydrothermal type antimony deposit related to granite porphyry in the southwest Sanjiang metallogenic belt. Its ore bodies are found out in the compression shear fault and fracture zone near the inside and outside contact zone of Ananduotang granite porphyry of Himalayanian phase, which is strictly controlled by fault structure. Through field geological survey and tectonic research, the author thinks that there are four stages of active faults in the mining area. Those faults have different ore-controlling features as follows. NNW Pantiange deep fault located in the eastern mining area is the boundary controlling faults of Ananduotang granite porphyry, and is the first-stage active faults as one of the ore-storage structures. The NE faults, mainly developed in Ananduotang granite porphyry, are the second-stage active faults and are one of the main ore-storage structures. The NW faults of the third-stage are the main ore-leading structures and ore-storage structures. The EW faults which are cutting the NW and NE faults are the latest active ones of ore broken structures.