The tectonic facies and tectonic evolution of Beishan orogenic belt,Gansu

On the basis of 1:250 000 scale regional geological survey of the Mazongshan map,through studied the volcanic-sedimentary formation,the evolution of magmatic rocks squence,the characteristics of metamorphism and space of every tectonic units of Beishan orogenic belt,and applied tectonic facies division theories,according to the characteristic of belt,Beishan polycycle multiple orogenic belt is respectively divided 15 sorts tectonic facies,and discussed its tectonic framework and tectonic evolution model in the Paleo soic.