Abstract: Five geoscience transects across the Tan-Lu Fault Zone show that crustal textures are obviously different on both sides of the fault zone.The difference is caused by strike-slip movement on the fault zone.Early Cretaceous magmatism during the strike-slip movement indicates that the fault zone put into crust-mantle boundary.These data demonstrate that the fault zone cut through whole crust during the strike-slip movement and the Moho should serve as largescale gentle detachment while decoupling took place between crust and mantle.During extensional activities of Late Cretaceo us to Eogene,intense upwelling of asthenosphere happened under the fault zone,leading to lithospheric necking in pure shear mode1.In compressive activities since Neogene,higher temperature of upper mantle due to shallower asthenosphere made the fault zone became a weaker belt in lithosphere.Therefore,the fault zone experienced stronger thrusting and large-scale eruption of mantle-derived basalt.