Abstract:

Meso-Cenozoic overthrusting in northern Qinling-Dabie orogenic belt can be divided into five episodes,namely Indonisian(T₂-T₃),Early Yanshanian(end of J₂-J₂),Late Yanshanian(end of K1),End of Yanshanian(end of K₂)and Early Himalayan (end of E).The basin controlling faults in Zhoukou depression and Hefei basin are the extension of the overthrust tectonic in Qinling-Dabie orogenic belt.The overthrust tectonics in the orogenic belt in the basin are characterized by their temporal synchrony and close spatial correlation.They would not only control the distribution pattern,structural framework,stratigraphic development and sedimentary formation of the basin,but would also control the formation and evolution of the basin and define the nature and type of the basin.The coupling of Mesozoic basin and range structures has been formed in the geodynamic setting of collision of Yangtze and North China plates,intracontinental subduction,and mountain uplift,extension and collapse.The overthrust tectonics at the end of Paleogene are related to the remote effect of subduction of Indian plate beneath Eurasian plate.

Key words: Qinling Dabie orogenic belt, Meso-Cenozoic, overthrust tectonics, Hefei basin, Zhoukou depression, basin controlling fault, tectonic coupling