Sedimentary Response to Permian Structural Movements in Wuxia  Foreland Thrust Belt of Junggar Basin

Key words: 
• Wuxia foreland thrust belt /
• Permian /
• fan development /
• synsedimentary fault

Abstract: By analyzing Permian structural sequence, sedimentation and faults characteristics, the author thinks that Wuxia area was a peripheral foreland restricted by nappe in Permian, there mainly developed submarine fans, fan deltas, fluvial fans and lakes, from under to upside, experienced deep sea stage, flysch stage and molasse stage, among which fans acted as typical lithosomic bodies. At the same time, structural evolution experienced intense divingcollision orogenesis stage, weakly compress occlude instant extend stage and revived strong thrusted stage, generating many thrusting reverse faults to influence sedimentation and denudation and control formation and evolution of fault belt. It is showed that the Permian is characterized by a model of forward thrusting movement and gradual advance migration of fan bodies. That is to say, with the forward thrusting movement of synsedimentary faults controlling the fans from mountainous region to the edge of the Junggar basin, fan bodies distributed in all fault belts gradually developed and advanced from the edge to the center of the Junggar basin and the fan bodies became larger, showing an obvious sedimentary response of gradual advance migration. There is an excellent coupling between them, so faults activity can be looked upon as main factor in controlling sedimentation in Wuxia area.