Abstract:

The Late Sinian Dengying Formation at Xiejiadian in Suizhou,Hubei Province is dominated by deep-water carbonate deposits of slope basin facies.Dolomitas develoved well in study area,and are characterized by fine crystals,poor crystal forms,stable lateral distribution and well horizontal lamination.The isotope analysis of carbon and oxygen show that the salinity decreases with the increase of water depth,indicating that the dolomites were the products of penecontemporaneous dolomitization,the Mg²⁺ was dervied from high salinity water in platform.According to above mentiioned,model of dolomitization has been established.