Abstract: The purpose of this paper is to study the environmental conditions and to illustrate the belts of the basic facies of the Upper Sinian carbonate rocks which are widely distributed in South China. The Dengying Formation of Upper Sinian consists mainly of dolomites containing a large number of algae of hdifferent structures. They are developed in the platform representing marine shallow water conditions. They were formed by the interaction between blue-green algae and a variety of mechanical and diagenetic processes. By means of petrographical analysis, carbonate rocks accumulated during Late Sinian in this area are divided into three basic facies belts:1) shallow marine platform, 2) slope and 3) open basin. In addition, based on palaeontologic and petrographic data, the shallow marine platform may be subdivided into several types: the lagoons on the platform, the algal banks, the algal banks with patch reefs and the foreslope of the platform. These facies will play an important part in tracing mineral resources and recognizing the relation between environment and life in the geological past. The data on the distribution and the thickness of carbonate rocks show that there is uniformity in the accumulation of carbonate rocks and the development of algal populations.

摘要： 长江流域是我国南方震旦系广泛分布的地区,川、黔、滇、鄂地区及苏、浙、皖地区,上震旦统碳酸盐岩发育,其中蕴藏着丰富的天然气、磷块岩、盐岩、菱锰矿、菱镁矿和白云石等重要矿产资源。因此,探讨碳酸盐岩的分布与形成环境,具有重要意义。