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《Geoscience》 2006-01
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The Tectonical Background and Evolution Process of Ordovician Marginal L-Shaped Paleouplift in Ordos Basin

WANG Qing-fei~(1,2),DENG Jun~(1,2),YANG Li-qiang~(1,2),GAO Bang-fei~(1,2),XU Hao~(1,2),HUANG Ding-hua~(3)(1.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China;2.Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education,China University of Geosciences,Beijing 100083,China;3.Faculty of Earth Sciences,China University of Geosciences,Wuhan,Hubei 430074,China)  
To find out the tectonic background and confirm the evolution process of the Ordovician marginal L-shaped(paleouplift) in Ordos Basin,a series of stress-strain simulations under various mechanic conditions were carried out,in which the basin was simplified into an isopachic,isotropic and elastic shell model.The positive strain along Z axis(ε_(z)) corresponded to the uplift,so the shape of positive ε_(z) isoline represented that of uplift.Only in the mechanic condition that the stresses imposed on the south and the west boundaries were equal did the ε_(z) isoline show the shape which was similar to the geological situation qualitatively.The simulation under this condition(recurred) the developing process of the L-shaped paleouplift.Two crescent uplifts appeared at the south and west edges of the basin followed by these two uplifts expanded and connected forming one larger L-shaped uplift,which extended toward the basin interior later.These numerical simulations proved that L-shaped(paleouplift) formed nearby the southwest edge of Ordos Basin because the intensity of the compression was similar which resulted from the subduction of the Qinling Trough in the south edge and the subduction of the Helan Trough and Qingqi Trough in the west edge respectively.
【Fund】: 国家重点基础研究规划项目(2003CB214600);; 教育部跨世纪人才基金项目;; 教育部科学技术研究重点项目(03178)
【CateGory Index】: P542.1
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