Figure 4.
Cartoons illustrating a possible scenario for the origin of anisotropic layering beneath eastern China. (A) Pervasive deformation occurred in the lithosphere during the collision between the South China block (SCB) and North China block (NCB) from the Triassic to Late Jurassic. In response to the NNW-SSE convergence, the lithosphere was thickening and developing lattice preferred orientation (LPO; shown as blue fusiform), the fast direction is predominantly parallel to the strike of collision belt. The thickened and anisotropic lithosphere was destroyed during the late Mesozoic, and only the shallow part of the anisotropic lithosphere survived. (B) Since the Late Cretaceous, lithosphere extension and asthenospheric flow were induced by the Pacific plate subduction beneath eastern China. The LPO of olivine (shown as red fusiform) developed in the asthenospheric flow and trends NW-SE, parallel to the direction of the subduction. TLF—Tan-Lu fault.