The Dongzhi fault zone is one of the important tectonic fracture zones with brittle NNE-striking slip properties in the southwest region of Anhui Province. Detailed structural analysis indicate that the fault zone experienced three-stage tectonic deformations primarily, including extensive and intense sinistral strike-slip movement occurred at the Late Jurassic to the earliest Early Cretaceous, extensional fault during the Early Cretaceous, and dextral strike-slip brittle structures at the Late Cretaceous to the Cenozoic. Based on the inversion of fault slickenside vector and the analysis of fault superposition and reconstruction relation, it is demonstrate that the regional stress field corresponding to the multi-stage deformation are as follows： nearly N-S compression, NNW-SSE compression, NW-SE extension, and nearly E-W compression. The formation and evolution of the Dongzhi fault zone is similar to the Tan-Lu fault zone, mainly controlled by various tectonic systems, including the collision between the North China and South China plate, subduction of the Izanagi plate and paleo-Pacific plate to the Eurasian plate, back arc expansion of the Pacific plate, and eastward tectonic extrusion resulted from the northward collision of the India plate.
Hu Zhaoqi Zhu Qiang Shi Ke Li Ziteng Le Chengsheng Jiang Laili. Tectonic evolution and structural deformation characteristics of the Dongzhi fault zone[J]. Chinese Journal of Geology, 2019, 54(3): 893-909.