侯明金1, 朱光2, Jacques Mercier3, Pierre Vergély3, 王永敏1
1. 安徽省地质调查院, 合肥, 230001; 2. 合肥工业大学资源与环境工程学院, 合肥, 230009; 3. Département des Sciences de la Terre, Université de Paris-Sud, F.91405, Orsay, France
ANALYZING ON GEODYNAMICS AND REGIONAL TECTONIC EVOLUTION OF THE TAN-LU FAULT ZONE (ANHUI SEGMENT) AND ITS ENVIRONS
Hou Mingjin1, Zhu Guang2, Jacques Mercier3, Pierre Vergély3, Wang Yongmin1
1. Anhui Geological Survey, Hefei 230001; 2. College of Resources and Environment Engineering, Hefei University of Technology, Hefei 230009; 3. Département des Sciences de la Terre, Université de Paris-Sud, F.91405, Orsay, France
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 field, striking NNW-SSE or nearly N-S, developed during Late Triassic to Early Jurassic, which related to the inner-continental orogeny and belonged to the Paleo-Tethyan regimes. A compressional stress field of NW-SE occurred during early Early Cretaceous, and resulted in the sinistral strike-slip movement of the NE-striking Tan-Lu fault, which attached to the Circum-Pacific Ocean regime. An extentional stress field of NW-SE created during middle-late stage of Early Cretaceous to Paleocene (or Eocene), a group of grabens or pull-apart basins formed along the Tan-Lu fault zone and its environs. A compression one of nearly E-W appeared in Cenozoic, which was evidenced by a series of thrusts or reversed faults developing.
Hou Mingjin,Zhu Guang,Jacques Mercier et al. ANALYZING ON GEODYNAMICS AND REGIONAL TECTONIC EVOLUTION OF THE TAN-LU FAULT ZONE (ANHUI SEGMENT) AND ITS ENVIRONS[J]. Chinese Journal of Geology, 2007, (2): 362-381.