Discovery of ductile shear zone and its geological significance in the Huajialing -Huluhe area, Gansu

The ductile shear zone of Huajialing-Huluhe,a disco rdogenic fracture of North Qilian orogenic and median Qilian land mass,is brittle-ductile shear zone with multip eriodic activity,strike NWW.By analyse and research of geomet rics,kinematics,dynamics,etc.We think the deformation peak is convergence coilision of North plate and South plate at late-Caledonian,matching weak continental crust (North Qilian) of south border of North china plate oblique thrusting overlap to median Qilian rigid block at south,soit produced obduction tenacity shear structu refrom NEE to SWW and right-slip.