Abstract:

There was much contention about the prototype of west-south Qadam basin because of its complex geology background. Based on the basin-range coupling theory, the tectonic geology events during Mesozoic and Cenozoic  were determined from the point that East Kunlun orogenic belt and westsouth Qadam basin were in a  common stress field, combining with versatile data and filed geology review. On the base of above named studies, the formation and reconstruction about the prototype of west-south Qadam were discussed .  The conclusions are as follows: Firstly, East Kunlun orogenic belt and west-south Qadam basin had suffered many periods of press and stretch events.  Among them, East Kunlun orogenic belt underwent perhaps postorogenic stretch during Lower and Middle Jurassic that might be the direct cause of the prototype of west-south Qadam basin during Mesozoic. Secondly, the pull-part geology background and the right-slip of Kunbei and Altun faults might be the main mechanism of prototype of Qadam basin during Cenozoic. Finally, the prototype basin was reconstructed by multi-episode press events during Mesozoic and Cenozoic.

Key words: west-south Qadam basin, East Kunlun orogenic belt, Mesozoic and Cenozoic, basin prototype, basin-range coupling