华南地体北缘（湖南部分）前寒武纪地层

THE PRECAMERIAN ON THE NORTHERN MARGIN OF THE SOUTH CHINA TERRANE （HUNAN PART）

摘要: 运用构造解析和多重地层研究手段，将华南地体北缘（湖南部分）的前寒武系，划分为新元古代青白口纪大江边组；震旦纪泗洲山组、天子地组、正园岭组、埃岐岭组、丁腰河组。测得大江边组的沉积年龄８５９—８６６Ｍａ，泗洲山组为７９４Ｍａ，埃岐岭组７１８—７２１Ｍａ。

Abstract: By means of the structural analysis and multiple stratigraphic classification,the Precambrian on the northernmargin of the Hunan terrane（Hunan part ） is divided into the Qingbaikou’an （Neoproterozoic ） Dajiangbian Forma-tion and Sinian Sizhoushan,Tianzide,Zhengyuanling,Aiqiling and Dingyaohe formations ,and the following isotopicages of sedimentation have been determined :859～866 Ma for the Dajiangbian Formation,794 Ma for the Siz-houshan Formation and 718～721 Ma for the Aiqiling Formation.