The petro-chemistry and Nd isotopes study of metamorphic intrusions in Kangding-Mianning,Sichuan province.

It was indicated that Kangding metamorphosed intrusions in Kangding and Mianning,Sichuan Province formed in island arc setting through the integrated study including whole rock chemistry,trace elements geochemistry and Nd isotopic geochemistry of plutonic rocks range from acid to basic ones.There is no isochrones formed by Sm-Nd isotopic data,which indicated these samples may have experienced a high temperature disturbance.Positive e_(Nd) (t) suggested that they may have derived from a relative depleted mantle source,and most of them had 1.2～1.4Ga depleted model ages.Through AFC (Assimilation and Fractional Crystallization) simulation,the results show that the assimilation rate was nearly equal to the crystallization rate when the residual magma fraction was about 60% of the original one.