Discussion on the precambrlan structural framework of the Gan-Hang tectonic belt

Progresses have been made successively on the study of the precambrian structural framework of the southern China. The comprehensive analysis and study on the precambrian formations and structures suggest that: the Cathaysia is a dismembered Early proterozoic old-land, the western Zhejiang-Northeast Jiangxi region was located at the active continental margin of the Cathaysia during the late stage of middle Proterozoic, Wuling movement is the most important orogeny in the southern China, and the collision between the Cathaysia and the Yangtze block along the Gangdongbei fault belt led to the formation of a united south China old -land. Because of different regional geological conditions, there exists evident difference in the late proterozoic tectonic evolution in different parts of the Cathaysia. During caledonian period, the studied region was developed into the Western Zhejiang Northeast Jiangxi aulacogen