Cenozoic Sedimentary Migration in Qaidam Basin and Its Significance on the Dynamic Mechanism

Key words: 
• Qaidam Basin /
• Cenozoic /
• sedimentary migration /
• stress field /
• dynamic mechanism

Abstract: Within the period of Cenozoic, the downwarping and the sedimentation have good relationships with the uplift of surrounding mountains. The regular change of the position, the range and the plane shape of sedimentary center indicates that Qaidam basin underwent three compressoshear stress field from the north Qilian mountain,the Altyn mountain and Kunlun mountain. The stress field from Altyn Mountain compressed continuously from the beginning to the end of Cenozoic. The stress field from northern and southern boundary also compressed continuously, and experienced a direction change history, the NESW direction(E),the NNESSW direction(E23N11) , nearly SN direction and NESW direction. So, the Cenozoic evolution pattern has been made according to which, the Qaidam Basin experienced four compressoshear stages, their directions are NESW(E),NNESSW(E23N11), nearly SN(N21N22) and NESW(N32Q).