Sedimentary Facies and Provenance Analysis of Late Cretaceous Taizhou Formation in Gaoyou-Haian Depression, North Jiangsu (Subei) Basin
苏北盆地高邮-海安地区晚白垩世泰州组沉积相及物源分析

Yizheng movement occurring in Late Cretaceous led to the unconformable superimposition of Taizhou Formation upon Chishan Formation or Pukou Formation. In this depression, the southern part is characterized by faulting and the northern part by overlapping. As a result, the sediments of fan, fan delta, braided delta and semi-deep lake are well developed in 1st Member of Taizhou Formation. From the edge to the center of the basin, the sedimentary facies change gradually from fan to fan delta or shallow semi-deep lake. During the deposition of 2nd Member of Taizhou Formation, there occurred a big lake transgression in the Gaoyou and Haian Sags, and the semi-deep lacustrine facies was well developed. Based on an analysis of the contour maps of garnet and staurolite, the percentage of sand stones (conglomerates), and the distribution pattern of sedimentary facies, the authors have reached the conclusion that the material sources of the sediments must have been mainly derived from the south of Sunan uplift and the north of Jianhu uplift.