Abstract: Wuxia fault belt in the eastern part of northwestern margin of Junggar basin is an important part in the thrust belt of the northwestern margin. There existed multiple unconformities owing to multistage structural activities. However, the large-scale erosions in the uplift areas of the fault belt and the surrounding margins allow the determination of the fault active periods to be difficult. This paper analyzes the sedimentation and the occurrence of the strata in Wuxia area and suggests that Wuxia area underwent the development of foreland basin of Early Permian, the overthrust nappe of Late Permian, the strong structural uplift of Late Triassic, the weak structural activity of Late Jurassic and the structural shape of Cretaceous followed by finally forming the configuration nowadays.

Key words: Junggar basin, northwestern margin, thrust belt, Wuxia fault belt, structural activity, overthrust nappe, structural uplift