Study on the tectonic-thermal evolution since Carboniferous in the north foothills of Dabie orogenic Belt
The north foothills of Dabie orogenic belt is located in the outside margin of Dabie orogenic belt.Its structural evolution is extremely controlled by the orogenic process of Dabie orogenic belt.The reconstruction of the tectonic-thermal history in the north margin area is significant to the study of the entire orogenic process of Dabie orogenic belt.On the basis of the systematic study of the strata above Carboniferous,the mineral crystallization pressure in the intrusive igneous rock,and the structural evolutional phase in the north margin area,this paper reconstructs the evolutional history and suggests the evolutional model.It is considered that the north margin area of Dabie orogenic belt has undergone three subsidences and three denudations since Carboniferous.