贵州省晴隆大厂矿集区重力三维反演及深部找矿潜力研究

贵州省晴隆大厂矿集区为锑矿产重要资源地之一,研究认为矿集区锑矿成矿与断裂及岩浆活动关系密切。研究以重力资料为主,结合地质、矿产及地球化学资料,对重力数据进行相关处理分析及反演,提取断裂信息,推断花岗岩体三维空间形态;综合分析断裂、岩体形态与地质、矿产及Sb-Au元素异常关系,推断认为深大断裂与浅部断裂为岩浆热液提供运移通道,并控制岩体顶面形态;在断裂F8与断裂F11所夹持区域内的大厂—碧痕一带以及沿断裂F11一带,茅口组灰岩、峨眉山玄武岩组和断裂均发育,成矿元素组合Sb-Au异常强度高、规模大,是深部找矿有利区域。这一研究成果为深部勘查提供地球物理依据。

Gravity three-dimensional (3D) inversion and deep ore prospecting potential in Qinglong-Dachang ore concentration area in Guizhou Province

Qinglong-Dacalhang ore concentration area is one of the important antimony deposit areas in Guizhou Province, and the fault structures and magnetic activities have great influence on the antimony mineralization. Based on gravity data, geology, mineral and geochemical data, the authors analyzed the fault structures and 3D morphology of granite body synthetically, by processing and inverting the gravity data in this paper. Combined with the condition the fault structures, shape of the rock body and geology, mineral and Sb-Au element anomalies, the authors also deduced that the deep faults and shallow faults provided a migration pathway for the magmatic hydrothermal fluids and controlled the top surface of the rock body. The limestone of Maokou Formation, Emeishan Basalt and fault structures were well developed in Dachang-Bihen area of the clamping area between fault F8 and F11, along with fault F11. The Sb-Au element anomalies were high, with large scale, which were a favorable region for deep ore prospecting. This research would provide the geophysical basis for deep ore prospecting.