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.