���ľ�����������м�ʯ�ѱ侶��������о�����, ��������ҪʴԴ�������ܺ���—ӡ֧�˶�Ӱ��������Եɽ��, ��ɽ�˶����ڲ���������ɽ�������֡���ʾ��ʴԴ����������ε�(��) �����˶�, �ڲ�Ե��5��( ��284.5 Ma����263.6 Ma����243.6 Ma����221.6 Ma�͡�199.8 Ma) , ���ڲ�������6��( ��344.2 Ma����275.2 Ma����244.9 - 246.8 Ma����210 - 220.3 Ma����186.9 - 195.7 Ma�͡�162.9 Ma) , ˵����ظ�ԭ������ǰ���������ж�׶Ρ�ͬ������¡���ص㡣����������, ���ľ��ؼ�����Եɽ����������ǿ-��-ǿ��������

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.