Sedimentary characteristics and palaeogeography evolution in the Late Permian of middle Yangtze area

By use of profile measuring, lithofacies and sedimentary facies analysis in the middle Yangtze, Late Permian mainly developed open platform, shelf and basin, Wuchiapingian developed shallow marine sediments, deep-water basin range is small, Changxing developed platform and basin facies, deep-water basin range is expanding. Sedimentary of the Late Permian is controlled by the activities of the south Qinling sea, an obvious sedimentary facies differentiation occurred during Late Permian, which is controlled by basin evolution. Palaeogeographic evolution show that the northern margin of the middle Yangtze Wujiapingian is deep basin, in the main middle Yangtze craton open platform developed, western Hubei trough is an isolated basin; Changhsingian transgression intensified and reach a climax in late Changxingian, the northern margin of the middle Yangtze is deep basin and the scope further expand, the Yangtze craton come into craton margin basin.