1. Key Laboratory of Western China's Environmental System of Ministry of Education, Lanzhou University, Lanzhou 730000, China; 2. College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China; 3. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China

The study of Cenozoic detrial zircon fission track age in Qaidam Basin suggests that the sedimentary exhumation-provenance is the peripheric mountains of the basin which had undergone Hercynian-Indochina event, but Yanshan movement only rep resented in Altyn Tagh Mt. The facts reveal that multip le thermo - tectonic events had taken place in the provenance, for five times ( ��284.5 Ma, ��263.6 Ma, ��243.6 Ma, ��221.6 Ma and ��199.8Ma) in the north margin of the basin and for six times ( ��344.2 Ma, ��275.2 Ma, ��244.9 - 246.8 Ma, ��210 - 220.3 Ma, ��186.9 - 195.7 Ma and ��162.9 Ma) in the west of the basin, which indicates the north part of Tibet plateau characterized by multi-stage and synchronous uplifting before Cenozoic, and tectonic activities in Qaidam Basin and its periphery experienced strong-quiescent-strong stages in Cenozoic.