THE CLASSIFICATION AND STRUCTURAL FEATURES OF THE PRECAMBRANN METAMORPHIC ROCK SERIES IN THE NORTHERN PART OF THE JIANGHUAI REGION

The redifined Precambrian metamorphic rock series in the northern part of the Jianghuai region consists in ascending order of the Upper Archean Pengfu Group, Lower Proterozoic Wuhe Group and Middle Proterozoic Fengyang Group. There occurred three phases of folding in them. The E-W-trending linear tight isoclinal folds made up of the Pengfu and Wuhe Groups and the Zhongyue’an weakly deformed migmatitic granite dome in between combine to form the basic tectonic framework of the region.There also occur the E-W-trending dextral ductile strike-slip shear zone and N-S-trending ductile thrust shear zone in the region.