Geometric and Kinematic Analyses of Gumudi Anticline in Southern Margin of Junggar Basin

The Gumudi anticline is a typical and complex structure unit of superimposed fault related folds in the piedmont of northern Tianshan Mountains, with strong deformation. Based on the analysis of 2D seismic profile crossing Gumudi anticline, constrained by the surface outcrop and drilling revealed structural appearances, this paper presents the shallow folds shapes by fault related folds analysis, speculates the deep structural styles according to the fold fault quantitative relationship in geometry, and then develops the reasonable structural model for Gumudi anticline, by which reappears the structural deformation procedures through kinematic recovery of this anticline. The study indicates that Gumudi anticline is a nearly east west trending anticline and its tectonic deformation took place from late Yanshan movement to middle late Himalayan movement. The eastern part of the shallow structures in Gumudi anticline is a front faulted extensional anticline, toward the west it transits to nearly two side symmetrical detachment like faulted extensional anticline, and the deep structure is a dual stacking structure with the roof Xishanyao coal seam of the Middle Jurassic and the floor Lucaogou formation of Permian.