Recognition of Meso- and Neoproterozoic Stratigraphic Framework in North and South China

In recent years,more and more high quality zircon U-Pb ages have been obtained for the Meso- and Neoproterozoic strata in North China and South China continents.A high-grade chronostratigraphic framework has been set up on the basis of these dating data.A high quality chronostratigraphic system constitutes the foundation for the global Precambrian study and stratigraphic correlation.Recent geological studies are therefore focused on the systematic SHRIMP zircon dating.This paper discusses the high-grade chronostratigraphic framework of the Meso- and Neoproterozoic strata and the starting time of the cover bedding of the Changcheng System according to new SHRIMP zircon dating data from the Qianxi complex(2534±9 Ma) and the diabase of the Chuanlinggou Formation(1638±14 Ma),and deals with tectonostratigraphy of the Neoproterozoic chronostratigraphic framework on the southeastern margin of North China continent by using the new SHRIMP zircon dating data.In China's stratigraphic framework,there is a distinguished zone of Proterozoic metamorphosed rocks and a series of magmatic rocks in the intermediate zone between the Yangtze Block and the Cathaysia Block,which is called the"Jiangnan orogenic belt".Moreover,This stratigraphic positioning constitutes an important program for reconstruction of the Late Precambrian tectonic framework and solution to the problem of positioning in the stratigraphic column.This paper also probes into the tectonic stratigraphic implications with new SHRIMP dating data from the Shuangqiaoshan Group in Jiangxi Province and an age data from the adjacent area in Anhui Province.