ON THE STIPULATION OF THE QINGBAIKOU SYSTEM IN THE SOUTH CHINA

There has been a long debate upon the important question whether the Qingbaikou System developed in South China and how its division and correlation can be made.In accordance with the principles of tectonomagmatic cycles,the Precambrian Systems mainly in Yangtze region are divided,studied and analysed in the paper,on the basis of the regional unconformity,sedimentary formation and correlation combined with the data of iso-topic age and micropaleobotany assemblage.The author proposes a scheme for the division and correlation of the Qingbaikou System in South China.Its bottom boundary is an unconformity resulted from the Jinning Movement,and its top boundary is at the bottom boundary of Liantuo Formation or the bottom boundary of equivalent horizons to Liahtuo Formation,with the isotopic ages being 100±Ma and 80±Ma,respectively.The strati-graphic characteristics of the system are discussed for each subarea.