Geochemical features and origin of Taoling pluton, eastern Jiangnan orogen

Abstract：Taoling pluton is located in northeast Jiangxi Province in the eastern part of Jiangnan orogen. The pluton is characterized by high potassium calc alkaline series, weakly peraluminous - strongly peraluminous nature, and high Mg#. Taoling pluton is enriched in LREE and LREE, and depleted in HFSE, with weak negative Eu anomalies (δEu=0.62-0.81) (except for sample TL-1, whose δEu is 0.47). Zircon LA-ICPMS U-Pb dating shows that the pluton intruded at 140±1 Ma. The initial 87Sr/86Sr ratios and εNd(t) of the pluton are (0.7131-0.7141) and (-7.43 - -6.71), respectively. Combined with previous studies, the authors hold that the mafic magmas ascended from the metasomatized mantle and heated the lower crust, triggering partial melting of metasedimentary basement in the depth (＞40 km) to form Taoling pluton, with the addition of relatively small amounts of mantle-derived materials.