The Confirmation of the Neoproterozoic Langshan Group in Inner Mongolia and Its Significance

There is a large Mesoproterozoic rift at the northern margin of North China Craton(NCC),and one of China’s most important metallogenic belts,the Langshan-Zhaertai Shan-Bayan Obo mesoproterozoic metallogenic belt is just located in this rift.This metallogenic belt contains some large or ultra-large ore deposits,such as the Bayan Obo iron deposits and ultra-large rare earth deposits,and the large Dongshengmiao Cu-Pb-Zn sulphide deposits.The Zhaertai Group is composed of a set of metamorphic rocks,interbedded with thin ferruginous