Geochronology Evidences for Tectonic Deformation of Dabashan Fold-Thrust Belt in Central China

The chronology of tectonic deformation event of Dabashan fold-thrust belt was quantitatively studied based on systematic analysis of fission track, K-Ar thermochronology and electron-spin resonance (ESR) dating. The results indicate that the tectonic activity event of North Dabashan fold-thrust belt occurred at 232-195 Ma. This tectonic event may be related to the collision with Yangtze block and North China block. The results also show that the tectonic event of South Dabashan fold-thrust belt happened at 133-100 Ma, 70-60 Ma, 48-33 Ma and 12 Ma. And these ages bear juvenility gradually from northeast to southwest, which is good match of the geometry and kinematics characteristic of tectonic spreading deformation in Dabashan fold-thrust belt. These geochronology data provid new constrains for better understanding the tectonic successively spreading deformation of Dabashan fold-thrust belt.