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ZHANG Yueqiao Institute of Geomechanics Chinese Academy of Geology Beijing ChinaPierre Vergely Jacques-Louis Mercier URA-CNRS: Geophysique et Geodynamique Interne Universite de Parie-Su Bdtment F- Orsay-Cedex France WANG Yongmin ZHANG Yong HUANG DezhiInstitute of Geology Bureau of Geology Mineral Resouces of Anhui Province Hefei China 《《地质学报》英文版》1999,73(3):264-274
Since the mid-late Eocene, North China has been subjected to extensional stress, resulting in the formation and development of basins. The dynamic origin of this crustal extension has long been an issue of debate. This paper presents the results of kinematic analyses of faults obtained from two seperated areas in North China. In the Weihe graben situated on the southernmost margin of the Ordos block, analyses of fault kinematics were coupled with an analysis of the basin's subsidence history. Three successive extensional tectonic phases accompaning the basin's formation and development have been distinguished. The Palaeogene extension was oriented in a WNW-ESE direction; the Neogene extension in a NE-SW direction and the Pliocene-Quaternary extension in a NW-SE direction. Such changes have also been recorded by fault kinematics along the southern Tanlu fault zone. This has been demonstrated by three successive sets of fault striations indicating normal dip slip resulting from NW-SE extension, then left- 相似文献
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