Contact relationship between Huayuanqiang Formation and Yangshan Formation of Yangshan coal-bearing measures in Beihuaiyang area

The structure of Yangshan coal-bearing measures is complicated in northern Huaiyang area of Dabie Mountains.The results of geological survey indicate that the Huayuanqiang Formation and the Yangshan Formation are divided by a fault.The discontinuous surface is obvious,and the tectonic deformation is different between them,which should be the products of different tectonic movements,and belong to different tectonic movement ages.Combining with the characters of sedimentology,tectonic deformation,kinematics,and dynamics,this study shows that there is an important tectonic movement in the late Paleozoic,so that the structural evolution in northern Huaiyang area could be divided into three important periods since the late Paleozoic: the formation period(the early Hercynian),the advancing period(the Indosinian),and the complete period(the late Yanshanian).Then the structural framework is established basically.