Lithospheric Types, Petrological Structures and Their Implications in Northwestern China Continent

On the basis of the geological and geophysical characteristics of northw estern China continent, cratonic type and orogenic-type lithosphere represented by Junggar Basin and Tarim in northw estern China continent are distinguished. And orogenic-type lithosphere can be subdivided in to Paleozoic orogenic-type lithosphere represented by Ejinaqi (old material and new structure) and Cenozoic orogenic-type lithosphere including Tianshan Mountain, Altai and Kunlun (old material and new structure). In light of the petrologica. method, model of crust-mantle evolution, orogenic forming process, relationships between the seismic velocity and pet rochemistry composition, petrological structu reprisms corresponding with different lithospheric types have been set up, crust-mantle material structure in differen tlithospheric types, geologic meaning of crust and Mantle's thickness and its significance for prospecting have been discussed.