Isotope geochemistry of granitoids in South China and their metallogeny

On the basis of data of initial strontium ratios for over 300 plutons, neod ymium isotopes for 240 plutons and oxygen isotopes for more than 200 pluton s, the granites of South China are divided into six belts which are differe nt from each other in petrology, geochemistry and mineralization. The simil ar Nd isotopic composition between the peraluminous granites and Proterozoi c crust reveals that there is intermediate to felsic composition crust at m id-crustal depth throughout the South China interior. The six granitic belt s mentioned above belong to different lithospheric plates with different co mposition basement. Differences in the extent and nature of interaction bet ween mantle and crusts in different geodynamic setting and the different ex tent of differentiation of magma have all controlled the characteristics of the granites and their related mineralization.