Analyzing on geodynamics and regional tectonic evolution of the Tan-Lu fault zone (Anhui segment) and its environs

According to the regional tectonic layer division and proceeding from a dynamic analysis of faults in the youngest strata, the analyses were performed layer by layer along the Tan-Lu fault zone and its environs. Through statistical analysis and calculation of striations on fault planes by means of the computer program, the paleostress state at every point was obtained, and then the state of the regional paleostress field was reconstructed. After that, the characters of paleostress fields in which fault movements occurred in different periods of time could be determined. Finally, a complete and successive evolutionary succession of the paleostress field could be determined. On that basis, and combined with an analysis of the features of regional tectonic deformation, the succession of tectonic events occurring in the Tan-Lu fault zone and its significance could be elucidated. The evolution of the regional tectonic paleostress fields since Late Triassic could be summarized as follows. A compressional stress fie