| Abstract: | Abstract The Middle Proterozoic Chartai Group separated by two unconformities consists of three depositional sequences: the Shujigou Formation-Zenglongchang Formation (DS I ), the Agulugou Formation (DS II ), and the Liuhongwan Formation (DSIU). The carbonate platform and back-platform basin are the basic environment model of the Chartai Group. The syndepositional faults on the oceanward side of the carbonate platform and large- scale slumping in the soft sediments are important marks of facies tracts. The newly established Zenglongchan uplifting, an epeirogenetic uplifting, plays an important role in the formation of the palaeogeographic framework of the Chartai Group. The stratigraphic correlation between the Chartai Group and the Bayan Obo Group is made for the first time by using sequence stratigraphic principie and model established by P.R. Vail. The Chartai Group, which was deposited on the northern passive continental margin of the North China platfom, represents the platform cover. |
