Genesis of the Zhilingtou gold deposit, Zhejiang Province, China: constraints from fluid inclusions and H-O-S-Pb isotope systematics

Liu Hanlun¹Yu Xiaofei^1*Duan Shigang²Sun Yandong³wang yingchao⁴Mao Jingwen^2*

• ¹China Geological Survey, Beijing, China
• ²Chinese Academy of Geological Sciences, Beijing, China
• ³Shandong Geological Sciences Institute, Jinan, Shandong Province, China
• ⁴Institute of Mineral Resources Research, China Metallurgical Geology Bureau, Beijing, China

The Zhilingtou gold deposit of Zhejiang Province, China, is located in the Qin-Hang metallogenic belt, which is considered the eastern part of the Cathaysia block. Here, we present the ore geology, fluid inclusion and H-O-S-Pb isotopes to elucidate the genesis and tectonic setting of the deposit. The gold orebodies are hosted within the Paleoproterozoic Badu Group gneiss without penetrating the overlying Cretaceous volcanic caprock, exhibiting stockwork, vein-like, and lens-shaped characteristics.show that the ore-forming fluids were derived from moderate-high temperatures (237-376°C) and low salinities (1.90-6.72 wt.% NaCl eqv) NaCl-H2O-CO2 systems and derived from a magmatic source. The continuous addition of meteoric water during the late stage led to a reduction in the temperature and salinity of the ore-forming fluids, and an increase in the precipitation of gold mineralization. Pb isotopes indicate that the lead was derived from the crust and was closely related to the gneiss of the Paleoproterozoic Badu Group. The gold mineralization is spatially closely related to the concealed biotite monzogranite (230 ± 1 Ma) and developed within the rock and along the contact zone with gneiss. Combined with the results of previous studies, we suggest that the Zhilingtou gold deposit formed in a late Triassic postcollisional extensional setting in the Indosinian, South China, and North China blocks and has excellent potential to form an intrusion-related gold deposit-type Au metallogenic system.