Zircon U-Pb Age, Geochemistry and Mineralization Prospective of the Caledonian Doushui Granitic Pluton in Southern Jiangxi Province

The Doushui granitic pluton situated in Shangyou county, Jiangxi province, is among the first recognized Caledonian granites in South China according to their geological occurrences, and no isotopic dating result has been reported yet. Zircon grains from the Doushui granite were analyzed using Laser Ablation-Multicollector Inductively Coupled Plasma-Mass Spectrometer(LA-MC-ICPMS) method, which yield a U-Pb age of 460.8±1.5 Ma. This age confirms that the granite was intruded in the Middle Ordovician, which was products of the first peak period of magmatism during the Late Caledonian period in southern China, indicative of a new cycle of folding and orogen. Comparing with the other rare earth bearing Caledonian granitoids in the Nanling region, the Doushi granite is unlikely to form ion exchangeable REE deposit.