DEVELOPMENT OF THE NS FAULTS ON THE WESTERN MARGIN OF THE ORDOS BASIN AND ITS GEOLOGIAL SIGNIFICANCE

The geometrical,kinematical and dynamical characteristics of the Qingtongxia Guguan Fault,a most important fault of the fault zone on the western margin of the Ordos Basin,were studied comprehensively in this paper.It is considered that the diabase outcropped in the fault zone belongs to "tectonic cool emplacement".The two sides of the fault zone have different geological development history of their own before the Carboniferous Permian period,and the sedimentary environment of the two sides is identical on the whole after the Triassic.It is suggested that the fault should be the collision-and-matching zone of different terranes.The Qingtongxia Guyuan fault zone plays an important controlling role in the formation of the Qilian Orogenic Belt on its western side and the Central Paleouplift of the Ordos Basin on its eastern side.