Some important problems on the structural study of the western Ordos block

Abstract：A uniform E-W compressional thrust nappe model was constructed for the north and south of the western Ordos block on the basis of a study of the structure of the western Ordos block conducted in the 1970s-1980s. However, this model has become more and more difficult to explain real geological problems as petroleum exploration and research in the area go on. In addition, the structural model of the uniform E-W-trending movement and N-S zoning in the western Ordos block is questioned, no large-scale foreland basin exists in the area and such problems as the transverse structural belt, N-S zoning and N-S-trending movement are presented—all these indicate that the complexity and diversity of the regional structures in the western Ordos block should be reconsidered. In analyzing and summarizing the structural characteristics and development model in the area, we should strengthen a comprehensive study and continuously supplement, revise and improve our original knowledge.