鄂东南沱期冰碛层的发现及震旦系的重新厘定

笔者认为鄂东地区存在南沱期冰碛层,并认为该区震旦系与红安群不存在上下关系,也不存在不整合关系;二者是不同的两个原岩建造,不同的形变期次和不同的沉积构造单元的产物。震旦系可以划分为上、下二统和四个组,其中潘家湾组和胡海凹组为新建组。

THE DISCOVERY OF THE NANTUO DRIFT SHEET IN EASTERN HUBEI AND REDEFINITION OF THE SINIAN SYSTEM

The author and others measured two Sinian sections,the Hu’ai’ao and Liu Xinfa sections,in eastern Hubei.The predecessors considered that there is an unconformity between carbanate rocks and clastic rocks,which implies the existence of the Jinningian movement.But the present author holds that an unconformity does not exist between both.Therefore the cla- stic rocks in the lower part should belong to the lower series of the Sinian System.The author has found that the gravels and sediments in the clastic rodks have features of a glacial drift and thus are assigned to the Nantuo drift sheet.The Sinian System in eastern Hubei is divided into the upper and lower series and four formations,of which the Panjiawan and Hu’ai’ao Formations of the lower series are newly established.