Zircon LA-ICPMS U-Pb dating of Hukeng granite in Wugongshan area,Jiangxi Province and its geochemical characteristics

Hukeng granite intrusion locates in southeast limb of Wugongshan compound anticline,where developed large scale Hukeng tungsten deposit that is an important part of Wugongshan W-Cu-Bi-Mo poly-metallic metallogenic belt.Through precise LA- ICPMS U-Pb dating of zircon from Hukeng granite,the crystallization age of the intrusion was determined to be 151.6±2.6Ma, corresponding to Late Jurassic era and ascribed to the first intruding event of granites in Mesozoic era in South China(164～153Ma). The formation temperature of granite magma was 676～695℃.Through the analysis of major and trace elements of Hukeng muscovite granites,they belonged to high-K calc-alkaline series and were thought to be metaluminous——weak peraluminous differentiation S-type granites.They should mainly derive from clay-enriched argillaceous rock source in upper crust and form under lithospheric extensional and thinning environment.