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题名:
Crustal rheological strength heterogeneities control the formation of continental plateau margins
作者: Liu Chang1,2,3; Zhu BJ(朱伯靖)4; Yang Xiaolin5
刊名: Journal of Asian Earth Sciences
出版日期: 2015-08
卷号: 107, 页码:62-71
DOI: 10.1016/j.jseaes.2015.04.005
学科分类: 地球科学::固体地球物理学
收录类别: SCI
通讯作者: Liu Chang, Email: liu@geologie.ens.fr
关键词: Tibetan Plateau ; Steep plateau margin ; Crustal convergence ; Viscosity contrast ; Crustal strength heterogeneity
英文摘要: 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. 
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)
语种: 英语
原文出处: 查看原文
ISSN号: 1367-9120
文章类型: Article
研究领域[WOS]: Geology
类目[WOS]: Geosciences, Multidisciplinary
关键词[WOS]: HIMALAYAN-TIBETAN OROGEN ; EASTERN MARGIN ; NORTHEASTERN MARGIN ; LONGMENSHAN FAULT ; NORTHERN TIBET ; SICHUAN BASIN ; FLOW ; DEFORMATION ; EARTHQUAKE ; EVOLUTION
WOS记录号: WOS:000358097500006
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ynao.ac.cn/handle/114a53/12314
Appears in Collections:非本单位_期刊论文

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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

Recommended Citation:
Liu Chang,Zhu BJ,Yang Xiaolin. Crustal rheological strength heterogeneities control the formation of continental plateau margins[J]. Journal of Asian Earth Sciences,2015,107:62-71.
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