Characteristics of overlapped faults in the north of the Tabei uplift and analysis of their genetic setting

Abstract：During the evolution of the Tarim superposed basin, the Tabei uplift went through three stages： old craton uplift, early foreland front uplift and Kuqa regenerated foreland basin slope. It experienced two stages of basin-forming structural transformation, giving rise to the deep- and shallow-level systems of overlapped faults in the north of the Taibei uplift： the deep-level fault system is a basement thrust one marked by a combination of thrusts and backthrusts, and the shallow-level fault system is a normal fault one, marked by a combination of grabens and horsts. The two fault systems with different characters correspond to two stages of formation of the foreland basin in the orogenic compressional environment. The deep faults were not formed in the early foreland deformation zone but resulted from fracturing of rocks during the longitudinal buckling of the intraplate Tabei old craton uplift in a compressional environment. The shallow faults are the result of extensional fracturing of the overlying strata due to lateral compressional warping deformation (longitudinal buckle deformation) of the basement (pre-Mesozoic tectonic layer) in the north of the Tabei uplift in the stage of the Kuqa regenerated foreland basin.