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How does crustal shortening contribute to the uplift of the eastern margin of the Tibetan Plateau?
Liu Chang1,2,3; Zhu BJ(朱伯靖)4; Yang Xiaolin5
Source PublicationJournal of Asian Earth Sciences
2015-03
Volume98Pages:18-25
DOI10.1016/j.jseaes.2014.10.037
Indexed BySCI
KeywordLongmen Shan Crustal Shortening Viscosity Contrast Eastern Tibetan Plateau Steep Plateau Margin
Abstract

The eastern margin of the Tibetan Plateau, the Longmen Shan, has triggered a vigorous debate to explain the uplift and maintaining of its steep and high topography. Several mechanical and kinematic models have been previously developed in order to investigate the tectonic and erosional control on the formation mechanism of the Longmen Shan. But the contribution of crustal shortening has never been taken into account due to the lack of significant surface convergence rate (about 3 mm/a) across the Longmen Shan range. We investigate this question through 2D finite element modelling assuming visco-elasticity rheology. The numerical results are constrained with geological and geophysical observations across the Longmen Shan range. We find that even low rate of crustal shortening contributes significantly to the uplift of the Longmen Shan. This contribution has been greatly underestimated in previous studies. The viscosity contrast between the Tibetan Plateau lower crust and the Yangtze crust crucially controls the uplift of the Longmen Shan due to crustal shortening. The ductile Tibetan lower crust thickens to accommodate most of crust shortening, as the eastward movement of the Tibetan Plateau is obstructed by the mechanical strong and stable Yangtze craton. The uplift rate contrast between the Tibetan Plateau and the Sichuan causes a steep uplift rate gradient to produce and maintain the Longmen Shan steep and high topography in the time scale of several million years. Our results support a possible explanation for the paradox of the high topography and low convergence rate at the Longmen Shan range.

Funding ProjectNational Natural Science Foundation of China[41404075]
Funding OrganizationNational Natural Science Foundation of China[41404075]
Language英语
Subject Area固体地球物理学
MOST Discipline Catalogue理学 ; 理学::地球物理学
SubtypeArticle
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Publication PlaceTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
ISSN1367-9120
URL查看原文
WOS IDWOS:000348955800002
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS KeywordWENCHUAN EARTHQUAKE ; LONGMENSHAN FAULT ; FLOW ; DEFORMATION ; EVOLUTION ; MODEL ; TOPOGRAPHY ; TECTONICS ; EXTRUSION ; MECHANISM
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12316
Collection个人在本单位外知识产出
Corresponding AuthorLiu Chang
Affiliation1.Institute of Geophysics, School of Physics, Huazhong University of Science and Technology, Wuhan, China
2.Laboratoire de Géologie, CNRS-UMR 8538, École Normale Supérieure, Paris, France
3.Key Laboratory of Computational Geodynamics of the 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
GB/T 7714
Liu Chang,Zhu BJ,Yang Xiaolin. How does crustal shortening contribute to the uplift of the eastern margin of the Tibetan Plateau?[J]. Journal of Asian Earth Sciences,2015,98:18-25.
APA Liu Chang,Zhu BJ,&Yang Xiaolin.(2015).How does crustal shortening contribute to the uplift of the eastern margin of the Tibetan Plateau?.Journal of Asian Earth Sciences,98,18-25.
MLA Liu Chang,et al."How does crustal shortening contribute to the uplift of the eastern margin of the Tibetan Plateau?".Journal of Asian Earth Sciences 98(2015):18-25.
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