STRUCTURAL CHARACTERISTICS OF THRUST SYSTEM IN THE FRONT OF THE WEST KUNLUN MOUNTAINS

There exists a thrust system in the front of the West Kunlun Mountains. With the difference in structures and deformation styles in different units of thrusting system, the West Kunlun thrust system, from north to south, can be divided into the north belt where the thin deformation is dominant, and the south belt where the thick deformation is dominant. The north belt can be subdivided into the arc\|shape structural belt in the north edge of parmirs, the Qimugeng structural belt, the Koukeya\|Sangzhu structural belt and the Pishan\|Hetian structural belt. The arc\|shape structural belt in the north of parmirs is a visible, East\|West trending,linear close thrust fold belt and fault belt;the Qimugeng structural belt is a potential blind\|thrust strike\|slip structural belt affected both by strike\|slipping and by the thrusting;the Koukeya\|Sangzhu structural belt is mainly a thrusting, potential blind\|thrust structure;Pishan\|Hetian structural belt is a typically visible thrust nappe. The differences in trend, margin condition and the control of space are the reasons for the different actions in structural belts. There are different structures between the region with changing structural line and its near\|by region, thereby, the complex thrust belt is formed in space.