中文摘要：

本世纪初这几年利用SHRIMP和La-ICP-MS锆石u-Pb法及其他新的定年方法已获得的定年结果表明，扬子与华夏板块的拼合发生在870-820Ma之间，形成格林威尔造山带的“陆-陆碰撞”发生在1190-980Ma期间，江南造山带的碰撞事件要滞后320-160Ma。江南造山带形成过程中普遍发生绿片岩相的区域变质作用，未找到格林威尔造山带中广泛存在的麻粒岩相的高级变质记录。根据这两点，目前无法确认江南造山带是格林威尔期造山带。江南造山带可能是Rodinia向Gondwana超级大陆过渡过程中两相邻陆块拼合的产物。在江南造山带西段，作为基底出露的四堡群、梵净山群、冷家溪群等曾被认为是中元古代地层，这些地层中砂岩的碎屑锆石定年表明，这些基底地层的最大沉积年龄为870-860Ma，属于新元古代。沿着江南造山带分布的S-型花岗岩可作为板块间碰撞、造山事件的岩石学记录，并非地幔柱岩浆作用的产物。江南造山带西段-760Ma的部分基性火山-侵入岩、扬子地块周边及华夏地块某些新元古代“双峰式火山岩”（803-818Ma）中的基性火山岩具OIB的地球化学特征，它们的规模很小，是造山后伸展阶段、软流圈局部上侵形成的，不能作为Rodinia裂解的岩石学证据。

英文摘要：

This discussion is made on the basis of age data reported in recent years of 21 century, which have been obtained by SHRIMP, LA-ICP-MS zircon U-Pb and other new dating methods. The assembly of the Yangtze and Cathysia blocks took place between 860 and 820 Ma. The continent-continent collision event forming Grenvillian orogenic belt spanned a period from 1190 to 980 Ma. Therefore, the collision between the Yangtze and Cathysia blocks occurred about 320-160 Ma later. The basement strata in the Jiangnan orogenic belt underwent thoroughly greenschist facies metamorphism. High grade metamorphism, such as granular facies existed widely in the Grenvillian orogenic belt, has never been found in the metamorphic sedimentary-igneous rocks in the Jiangnan orogenic belt. Because of above two reasons, the Jiangnan orogenic belt should not be considered as a Grenvillian orogenic belt. It is proposed that the Jiangnan orogenic belt might be a product of collision between two neighborhood blocks during the transformation from the Rodinia to Gondwana supercontinent. The Sibao, Lengjiaxi and Fanjingshan groups in the western part of the Jiangnan orogenic belt, as basement strata, were previously believed to be Mesoproterozoic. Recent dating results of detrital zircons from the sandstones of the basement strata indicate that these strata have the maximum depositional ages of 870-860 Ma, i.e. Neoproterozoic. The S-type granites distributed along the Jiangnan orogenic belt may be considered as a petrological record of the continent-continent collisional event between the Yangtze and Cathaysia blocks rather than the products of plume magmatism. Some Neoproterozoic mafic volcanic-intrusive rocks （-760 Ma） from the western part of Jiangnan orogenic belt and the mafic rocks from the bimodal volcanic rocks （803-818 Ma） distributed around or within the Yangtze block or within Cathaysia block show some geochemical signatures of OIB. However, their exposed volumes are very small. They might have been generated in the post-orogenic ext