Tectonic feature and strain pattern of Changling fault depression on the southern edge of Songliao Basin. Geological Bulletin of China

By means of structure-stratigraphy method, based on the knowledge of faulting active phase, pattern of the basin edge as well as tectonic deformation traced by deposition record, with the help of systematic 2 dimension structure-stratigraphy balance recovery, it’s indicated that during the developing process of Changling faulted depression, there was clockwise rotating from NE-SW to EW along the expanding direction.This movement generally happened at the same time as formation of Lower Cretaceous Shahezi Group. Because of the special tectonic location of Changling faulted depression on the southern edge of central Songliao Basin, in this early stage, noticeable northeast expanding depression overlapped later northwest tectonic expanding, which leads to complicated tectonic pattern.