U-Pb ZIRCON AGE OF LIANHUASHAN PLUTON IN THE JUNCTION OF ANHUI-ZHEJIANG-JIANGXI PROVINCES: Geological Implication

The Lianhuashan pluton in the junction of Anhui-Zhejiang-Jiangxi provinces is located in the southeast margin of Yangtze Plate, namely the junction zone of Yangtze Plate and Cathaysia Plate (the northern margin of eastern section of Jiangnan orogenic belt). The pluton intruded into the late Neoproterozoic Shangshu Formation (northeastern Jiangxi), with the lithology of syenogranite and granophyres. In later period, the metamorphic deformation resulted in foliated and greenschist facies epimetamorphic mineral assemblage. The geochemical characteristics indicate that the Lianhuashan granite is probably A₂ type formed in continental margin post-orogenic environment. The zircon LA-ICP-MS U-Pb dating of the pluton yields the age of 878±70 Ma, which is the product of late Jinning Period.