Petrogenic and metallogenic geochronology and its geological significance of the Dawangshan quartz vein type scheelite-molybdenite polymetallic deposit in central Jiangxi Province
1. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China 2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China 3. China Geological Survey, Wuhan Center, Wuhan 430205, China
The Dawangshan tungsten-molybdenum polymetallic deposit in Jiangxi province is a typical quartz vein type deposit, lies in the Dawangshan-Yudu Cu-Mo-Au-Ag-Pb-Zn ore belt. The ore-bearing rock mass is characterized by multiple stages. According to the LA-ICPMS zircon U-Pb dating technique, the diagenetic age of fine-grained granite in the late stage is 145.1±0.89 Ma, which is close to the formation time of medium-grained granite formed in the early stage (147.8±1.9 Ma). Using the Re-Os isotope dating technique of molybdenite, the metallogenic age was 147.6±1.8 Ma. Indicating that the deposit was formed in the late Jurassic, It is consistent with the diagenesis and mineralization age of Yanshanian quartz vein type tungsten molybdenum polymetallic deposit in Nanling area. Re content of molybdenite has important reference value to indicate the source of mineralization materials. The Dawangshan tungsten-molybdenum polymetallic deposit is related with Yanshanian granites, the Re contents of molybdenite samples is 2 215×10 -9~10 183×10 -9, It is consistent with the characteristics of tungsten deposit associated molybdenum,which indicates that the ore-forming materials are likely to come from the crust or crust-mantle-derived ones. In combination with metallogenic geological background, the author infers that the Dawangshan deposit is associated with the subduction of the Paleo-Pacificocean plate beneath the Eurasian continent. It is proposed that the ore-forming materials were extracted by alkali metasomatism between the magma and the wall rock and then concentrated in the favourable areas.
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