LA-ICP-MS Zircon U-Pb Dating and Petrologic Geochemistry of Finegrained Granite from Zhuxi Cu-W Deposit, Jiangxi Province and Its Geological Significance

Zhuxi W-Cu deposit in northern Jiangxi Province is a recently found super large skarn W deposit. The formation of this deposit is closely related to granitic intrusions. The mining area is located in the central Jiangxi Taqian-Fuchun ore belt in Qin( zhou)-Hang( zhou) joint zone. The discovery of this deposit is further evidence for the model of the Southern tungsten North expansion. However,due to the lack of systematic geochemistry and geochronology of ore-related intrusions,the knowledge of this model is limited. Ore-related fine-grained muscovite granite was chosen as the research object for the study reported on in this paper. LA-ICP-MS zircon U-Pb dating of granite yielded a206 Pb /238 U weighted average age of 146. 90 ± 0. 97 Ma( MSWD = 0. 55). These granitic rocks have high silicon,alkali and potassium,and are strongly peraluminous,which belongs to the typical S-type granite. This study has indicated that ore-related magmatism occurred at the late Jurassic in Jiangnan uplift and provides new evidence for the genesis of Zhuxi W-Cu deposit and metallogenic regularity of the Taqian-Fuchun metallogenic belt.