The characteristics and tectonic significance of Meso-Proterozoic late stage granitoids in Wucuan-Kangbao
华北北部武川-康保地区中元古代晚期花岗岩类基本特征及其构造意义

Mesoproterozoic late stag granitoids occurred in Wucuan-Kangbao of Central Inner Mongolia, mainly consist of biotite granites and monzonitic granites. Two types of granites are peraluminous granite having high SiO_2,K_2O and low FeO, MgO, CaO, TiO_2,A/CNK>1. 1; trace elements have high Rb, K, Ta, Nd, Hf and low Nb, Sr, P, Ti; Two types of granites have strong contrast between LREE and HREE (La/Yb = 6. 61 - 54. 63), REE models have middle negative Eu abnormality. The granitoids belt is approximately EW-trenging and parallel with Mesoproterozoic island arc belt of Bainaimiao group and Weijiagou rock group and ophiolite melanges belt of Kaiyuan rock group. Our research suggests thant Wucuan-Kangbao granitoids belts belong to syn-collisional granitoids(S-type). They were produced during processes of Mesoproterozoic late stage subduction and collision between the North China Plate and Xiboliya Plate. The correlation of North China Plate with other Plates of the world on Mesoproterocoic tectonics will provide important constraints for reconstruction of Rodinia.