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《Acta Geologica Sinica》 2007-04
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Structural Styles of the Eastern Boundary Zone of the Ordos Basin and Its Regional Tectonic Significance

LIAO Changzhen1), ZHANG Yueqiao2), WEN Changshun1)1) Earth Science and Resource College,China University of Geosciences, Beijing, 1000832) Department of Earth Sciences,Nanjing University, Nanjing, 210093  
The eastern boundary zone of the Ordos Basin is a complicated tectono-morphological belt, which developed during the Yanshanian tectonism and is made up of the Lishi fault and the Jin-Shan fold belt. This paper describes segmentation feature and fault structural styles of this boundary zone. Paleo-stresses have been determined using measured fault slip vector data and Jurassic-Cretaceous stress evolution has been established. Three structural styles were identified: backthrusts, hang wall ramp fold and cover rock decollement. It is inferred from this analysis that the eastern boundary zone of the Ordos Basin consists of backthrust and/or hang wall ramp along the frontal zone of a westward propagating flat-ramp style system, which may have developed beneath the Shanxi faulted uplift. Fault breccia and tectonic lenticles well develop along the boundary zone. Results of fault kinematic analysis show multiple compressions with the orientations varying from NW-SE to nearly W-E, and to NE-SW. Segmented structural styles and compressional stress directions of this boundary zone recorded intracontinental deformation pattern during late Jurassic period in North China and provided important constraints of structural geology on the study of geodynamics of this deformation and far-field effects produced by subduction of the Paleo-Pacific Plate beneath the eastern Asian continent.
【Fund】: 国家重点基础研究发展计划“973”项目(编号2003CB214600)资助成果
【CateGory Index】: P542
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