Research on the site selection of Nanling Scientific Drilling-1

Abstract：The Yinkeng ore field in Jiangxi Province is one of the first prior research targets of Sinoprobe-Deep Exploration in China, with the exploration of the ore-forming regularity of deep mineral resources as the main aim. Geological exploration profiling survey, geochemical survey, ore field structure, magmatism, typical ore deposits and integrated geophysical studies were conducted in this region. It is revealed that hypothermal W-polymetallic deposits and mesothermal Au-Ag-Cu-Pb-Zn polymetallic deposits characterized by metallogenic zoning are existent in 2D space. According to the study of ore-forming regularity of magmatism and typical deposits, the authors hold that the two types of ore deposits are temporally, spatially, and genetically closely associated with the two series of magmatic activities at the early stage of Yanshanian period. Accurate rock-forming and mineralization chronology framework was established, which suggests that the two types of deposits have space-time relationship. By using high-accuracy gravity and magnetic area survey and the detection methods of major cross-sections such as ground magnetic survey, seismic reflection, and CSAMT/AMT, the authors carried out comprehensive geophysical detection research, and primarily determined the deep structure of strata-rock body-structure. The results obtained by the authors provide the scientific basis for the site selection of Nanling scientific drilling (SP-NLSD-1) (Fig.2). Furthermore, it is revealed that dual-layer structure of mineralization may be exist in the Yinkeng ore field, which contributes to the further research on the ore-forming regularity of Nanling region in 4D time-space.