Research Progress of Magmatic Hydrothermal Mineralization in the Polymetallic Ore Concentration Area of Southern Hunan

The medium-acidic igneous rocks are widely exposed in the southern Hunan province, in the middle part of the Nanling metallogenic belt, and commonly associated with large scale and distinctive ore mineralization. There are many world-class ultra-large to large Cu-W-Sn-Pb-Zn deposits occurring around the intrusions. Because of the unique ore mineral resources, the Indosinian-Yanshanian granites and associated ore deposits in the region have been focus of many reseaches. In this paper, we compile a large dataset of petrological, chronological, and geochemical results of the ore-related granites and the polymetallic deposits. The major and trace elements, Sr-Nd-Hf isotopes, ages and stable isotope compositions of the ore-related granites and the ores of the polymetallic deposits in the southern Hunan polymetallic ore concentration area are compiled and analyzed. The results show that the types of granites in Southern Hunan are complex and have obvious metallogenic specificity. The overall polymetallic mineralization is closely related to granites in time and space. The peak ages of granite magmatism are 240 Ma to 230 Ma (Indosinian) and 160 Ma to 150 Ma (Yanshanian). But the peak period of polymetallic mineralization is the early to middle Yanshanian. Stable isotope compositions indicates that the ore-forming materials are mainly derived from magmas, and are obviously contaminated by the sedimentary rocks and atmospheric precipitation in the later stage. The Sr-Nd-Hf isotope data show that the granite magmas were mainly derived from the crust, with a small amount of mantle source mixing. The comprehensive study suggests that it is necessary to further deepen the in-depth study of polymetallic composite metallogenic mechanism, magmatic evolution, and ore-controlling mechanism of tectonic system and magmatic hydrothermal metallogenic system. © 2023 Science Press. All rights reserved.