Establishment and Geological Significance of “Western China Block”

Based on the data of geology, geochemistry, geophysics, and deep tectonic evolution, we discuss the double-basement-crystalline-basement (Ar₃Pt₁),folded-and-metamorphic basement (Pt_2-3),cover (NhZ),upper and lower glacigenic rocks, and boundary of blocks in "Western China Block".The "Western China Block" compose of Tarin,Qaidam,China Tianshan, and Dunhuang massif, the middle-north QilianM ountains, A lashan massif.