SHRIMP Zircon U-Pb Dating,Geochemistry,Sr-Nd-Hf Isotopic Analysis of the Yingqian Intrusion in Jiangxi Province,South China and Its Geological Significance
The Yingqian intrusion is located in southern Jiangxi Province of the East Nanling region, and consists of granitoids of two periods of granitoids, mega-porphyritic granodiorites and fine-grained granites.SHRIMP zircon U-Pb dating indicates that the Yingqian intrusion is a Mid-Jurassic magmatic pluton.All of the rocks fall into the calc-alkaline category.LILE enrichment and HFSE depletion, and significantly negative Nb-Ta anomalies characterized the primitive mantle-normalized trace element spidergrams of the rocks.It indicates that the Yingqian intrusion were result of partial melting of ancient crustal materials,interacted with mantle-derived magmas.The Mid-Jurassic magmatism along the “Shi-Hang” belt formed in a continental crustal thinning setting,which is a favorable event of interaction between crustal and mantle.