Mapping the Upper Mantle Discontinuities beneath North China Craton from Common Conversion Points Method with Teleseismic Receiver Functions

It is very important to study the structure of upper mantle transition zone to understand the tectonic environment of the lithosphere above.In this paper,we calculate the P receiver functions from the teleseismic events recorded by 35 stations in a line across the North China Craton(NCC),and then mapping the upper mantle structure from the method of common conversion points.The result shows that:the three blocks of the North China Craton stay in different tectonic environment,the western block stay in a stable environment,while the trans-North China oragan in a strong mantle convection circulation environment.The subducted pacific slab under the eastern block formed a relative low temperature under the eastern NCC.So the mantle convection plays an important role in the formation of the Shanxi fault depression zone by contrast with the dextral rotation which is the mainly force of the Huabei fault depression zone.