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Crustal rheological strength heterogeneities control the formation of continental plateau margins
Liu Chang1,2,3; Zhu BJ(朱伯靖)4; Yang Xiaolin5; Liu Chang, Email: liu@geologie.ens.fr
2015-08
发表期刊Journal of Asian Earth Sciences
ISSN1367-9120
卷号107页码:62-71
摘要The margins bordering the Tibetan Plateau show two end-member morphologies in topographic gradient: steep margins and low-gradient margins. To investigate the formation mechanism of convergent intracontinental plateau margins, we conduct 2D numerical experiments to simulate crustal deformation process across plateau margins. Our numerical experiments demonstrate that heterogeneities in crustal rheological strength control significantly the formation of plateau margins when subjected to crustal convergence. A very steep margin is the result of crustal convergence between plateau with weak lower crust and foreland basin with strong lower crust. By contrast, a low-gradient margin could result from crustal convergence between plateau and foreland with less strength contrast. This finding suggests that the diversity in topographic gradient along the Tibetan Plateau borders reflects heterogeneities in crustal rheological strength across the plateau margins. Steep gradient at the margins indicate large crustal rheological strength contrasts between the weak ductile lower crust of the Tibetan Plateau and its strong surrounding foreland basins, like the Sichuan Basin, the Tarim Basin and the Qaidam Basin. Beneath these steep margins the horizontal flow of the Tibetan ductile lower crust is inhibited and forced to extrude to support escarpments. Low-gradient at the margins indicate less crustal strength variations between the plateau and outer forelands, like at the northeastern and southeastern margins, where they might be outlets for the weak ductile Tibetan lower crust to flow away from the plateau. 
关键词Tibetan Plateau Steep Plateau Margin Crustal Convergence Viscosity Contrast Crustal Strength Heterogeneity
学科领域固体地球物理学
DOI10.1016/j.jseaes.2015.04.005
项目资助者National Natural Science Foundation of China(41404075, 41274141) ; CAS/CAFEA(KZZD-EW-TZ-19) ; China National Science and Technology Support Program(2012BAK19B03-5)
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收录类别SCI
语种英语
文章类型Article
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000358097500006
关键词[WOS]HIMALAYAN-TIBETAN OROGEN ; EASTERN MARGIN ; NORTHEASTERN MARGIN ; LONGMENSHAN FAULT ; NORTHERN TIBET ; SICHUAN BASIN ; FLOW ; DEFORMATION ; EARTHQUAKE ; EVOLUTION
引用统计
被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12314
专题非本单位
通讯作者Liu Chang, Email: liu@geologie.ens.fr
作者单位1.Laboratoire de Géologie, CNRS-UMR 8538, École Normale Supérieure, Paris, France
2.Institute of Geophysics, School of Physics, Huazhong University of Science and Technology, Wuhan, China
3.Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing, China
4.Department of Earth Sciences, University of Durham, Durham, UK
5.Earthquake Administration of Shaanxi Province, Xi’an, China
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GB/T 7714
Liu Chang,Zhu BJ,Yang Xiaolin,et al. Crustal rheological strength heterogeneities control the formation of continental plateau margins[J]. Journal of Asian Earth Sciences,2015,107:62-71.
APA Liu Chang,Zhu BJ,Yang Xiaolin,&Liu Chang, Email: liu@geologie.ens.fr.(2015).Crustal rheological strength heterogeneities control the formation of continental plateau margins.Journal of Asian Earth Sciences,107,62-71.
MLA Liu Chang,et al."Crustal rheological strength heterogeneities control the formation of continental plateau margins".Journal of Asian Earth Sciences 107(2015):62-71.
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