Re-Os dating of molybdenite from the Hukeng tungsten deposit in the Wugongshan area,Jiangxi Province,and its geological implications

Hukeng tungsten deposit is one large scale quartz vein type wolframite deposit in the Wugongshan metallogenic belt in central Jiangxi Province.For the purpose of studying the chronology of the deposit,five molybdenite samples from the paragenetic wolframite in the W-bearing quartz veins were selected to do the Re-Os dating,yielding an isochrone age of 150.2±2.2Ma and weighted average model age of 149.82±0.92Ma.These results indicate the Hukeng tungsten deposit formed in about 150Ma and was the product of the peak period of Mesozoic large scale petrogenesis and metallogenesis in South China.The molybdenites from the Hukeng tungsten deposit have a very low content of Re,showing a crustal source for ore-forming materials.The deposit formed in the Yanshanian lithospheric extensional and thinning environment.