The type and basic characteristics of Beishan orogenic belt, Gansu

Beishan orogenic belt passed complex geological evolution by multistage plate divergence-subduction-collision-fitting, with the characteristics of ploycycle multiple orogeny. Through studying about tectonic units established, old plates rebuilded, original basins restored, texture and structure of orogenic belt, mechanism and model of orogeny, it is definded that the type of Beishan orogenic belt is continent-accretion arc collosion orogenic belt.