The Shuikoushan ore district, located in southern Hunan Province, South China, contains Pb-Zn-Au mineralization hosted in the Devonian to Triassic strata and Mesozoic granodiorite intrusions. Ore minerals are mainly pyrite, sphalerite, galena and minor molybdenite. Molybdenite, usually intergrown with pyrite, formed during Pb-Zn hydrothermal mineralization. In order to determine the precise age of Pb-Zn mineralization and further understand the relationship between magma emplacement and hydrothermal mineralization in the ore district, molybdenite Re-Os dating and zircon SIMS U-Pb dating were undertaken. The zircon U-Pb dating reveals that the granodiorite intrusion was emplaced at 158.8±1.8Ma (MSWD=0.40). Re-Os isotopic age of seven molybdenite samples yields model ages ranging from 157.5±2.5Ma to 161.0±2.4Ma, and gives a well-defined <sup>187</sup>Re-<sup>187</sup>Os isochron age of 157.8±1.4Ma (2σ, MSWD=1.3), indicating the timing of Pb-Zn mineralization in the Shuikoushan ore district at about 158Ma. This date coincides well with the zircon SIMS U-Pb age of the granodiorite, revealing a genetic association between the Pb-Zn mineralization and the granitic magmatism. Combined with geochronological data published for other Pb-Zn-(Cu) deposits in southern Hunan, it can be concluded that the granodiorite-related Pb-Zn mineralization throughout southern Hunan mainly occurred at 160-156Ma, rather than 180-170Ma or 170-160Ma as considered previously. The Pb-Zn mineralization and major W-Sn mineralization in southern Hunan are coeval and may be related to the same geological event.
Huang, J. C., Peng, J. T., Yang, J. H., Zhang, B. L., & Xu, C. X. (2015). Precise zircon U-Pb and molybdenite Re-Os dating of the Shuikoushan granodiorite-related Pb-Zn mineralization, southern Hunan, South China. Ore Geology Reviews, 71, 305–317. https://doi.org/10.1016/j.oregeorev.2015.06.011