SINIAN SEA LEVEL FLUCTUATIONS AND ORE-CONTROLLING PROCESSES IN THE YANGTZE AREA

On the basis of the distribution of the Sinian manganese, phosphorite and iron deposits in the lower part of the transgressive sequences on the Chang' anian and Nantuoian tillite horizons, the sea level fluctuations created by glaciation are believed to be the main controls on the formation and distribution of the Sinian phosphorite, manganese and iron deposits, and thus the mineralization models of the Sinian phosphorite and manganese deposits in the Yangtze area are proposed. In addition, the characteristics of δ ¹³C and δ ³⁴S, rare earth elements and trace elements from the Sinian manganeseand phosphorite-bearing series are similar to the diagenetic and mineralization, characteristics caused by the Cenomanian—Turonian （Cretaceous） sea level rises in Europe. This demonstrates the correctness of the theory of "upwelling current" caused by the Sinian post-glacial sea level rises.