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THE BALANCED CROSS-SECTION AND SHORTENING IN QIANGTANG TERRAIN QINGHAI—TIBET PLATEAU
引用本文:Li Yalin,Wang Chengshan,Wu Shan,Ding Xuelin[WT5,5”BX](Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China). THE BALANCED CROSS-SECTION AND SHORTENING IN QIANGTANG TERRAIN QINGHAI—TIBET PLATEAU[J]. 地学前缘, 2000, 0(Z1)
作者姓名:Li Yalin  Wang Chengshan  Wu Shan  Ding Xuelin[WT5  5”BX](Institute of Sedimentary Geology  Chengdu University of Technology  Chengdu 610059  China)
作者单位:Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China
摘    要:THE BALANCED CROSS-SECTION AND SHORTENING IN QIANGTANG TERRAIN QINGHAI—TIBET PLATEAU


The Balanced Cross-Section and Shortening in Qiangtang Terrain Qinghai-Tibet Plateau
Li Yalin,et al. The Balanced Cross-Section and Shortening in Qiangtang Terrain Qinghai-Tibet Plateau[J]. Earth Science Frontiers, 2000, 0(Z1)
Authors:Li Yalin  et al
Abstract:Geological studies indicate that Qinghai|Tibet plateau crust has shortened at least 2500km and the thickness was increased to 60~70km in the past 45Ma. Different researchers advocate different views to explain the shortening according to their studies.( Tapponnier,1977;Chang et al,1986;England et al,1986;Murphy,1997;Y.Pan,1999),however it is still unresolved on how much shortening in upper crustal especially in Qiangtang terrain.Qiangtang terrain is located in the center of Qinghai|Tibet plateau, the tectonic deformation has been resulted from intracontinental convergence and collision of India plate with Eurasian plate.The deformation style of Qiangtang terrain shows east|west|trending folds and thrusts which formed in the shallow tectonic level during collisional|intracontinental period. The folds type is characterized by nonpenetrative|foliation parallel fold, the hinges have the same trend with the thrusts. These traits are favourable for restoring the balanced cross|section and measuring the shortening. The balanced reconstruction is based on line balancing on three different stratigraphic sections (A,B and C)across the Northern Qiangtang basin in the area between 85°E and 87°E.The sections are all north|south|trending in accordance with the moving direction of thrusts.
Keywords:Qiangtang terrain  balanced cross|section  deformation style  shortening
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