苏浙皖边界地区苏皖运动的有关问题

A DISCUSSION ABOUT THE SUWAN MOVEMENT ON THE BORDERLAND OF JIANGSU, ZHEJIANG AND ANHUI

苏皖运动的存在于否,对研究苏浙皖边界地区的地质发展史和正确认识长兴阶地层有重要意义。笔者论证了长兴组的厚度变化、界线粘土层的性质与成因、底砾岩的确认和地层接触关系、古生物群的突变等问题,认为:1)区内苏皖运动是存在的;2)砺山—江阴海堤不可否定;将安徽广德牛头山经江苏宜兴至江阴条带内的龙潭组上部地层作为长兴组的相变产物是不妥的。

It is important whether the Suwan Movement exist or not for researching the geological history of the border region of Jiangsu ,Zhejiang and Anhui and recognizing the Changxing formation really. After making studies of the thickness change of Changxing formation,the features and genesis of the boundary clay band,the basal conglomerate and the contact relationship between strata,as well as the mutation of palaeobiota,we propose follows: first the Suwan Movement is existent,though it is not so extensive and strong that con be some-times called Suwan dislocation. Secondly the existence of Lishan-Jiangyin seawall is true. And it may be false to regard the upper part of Longtan formation distributed from Niutoushan,Anhui to Jiangyin,Jiangsu as the facies change of Changxing formation.