DOI: 10.1002/grl.50446
论文题名: Formation mechanism of steep convergent intracontinental margins: Insights from numerical modeling
作者: Chen L. ; Gerya T.V. ; Zhang Z.-J. ; Aitken A. ; Li Z.-H. ; Liang X.-F.
刊名: Geophysical Research Letters
ISSN: 0094-9056
EISSN: 1944-8787
出版年: 2013
卷: 40, 期: 10 起始页码: 2000
结束页码: 2005
语种: 英语
英文关键词: intracontinental convergence
; numerical modeling
; steep margin
Scopus关键词: Crustal thickenings
; Formation mechanism
; Inherent characteristics
; intracontinental convergence
; Lithospheric structure
; Numerical experiments
; steep margin
; Topographic gradients
; Structural geology
; Tectonics
; Numerical models
; continental margin
; convergence
; convergent margin
; crustal thickness
; experimental study
; lithosphere
; numerical model
; topographic effect
; China
; Qinghai-Xizang Plateau
; Sichuan Basin
; Xizang
英文摘要: The margins surrounding the Tibetan Plateau show some diversity in topographic gradient. The most striking example is the eastern Tibetan margin bordered by the Longmen Shan range, which is characterized by a remarkably steep topography transition between eastern Tibet and the Sichuan Basin. There is significant uncertainty over whether this margin was formed by crustal shortening or lower-crustal flow. To investigate the formation mechanism of steep convergent intracontinental margins, we conducted petrological- thermomechanical numerical simulations based on the lithospheric structure and thermal state of the eastern Tibetan margin. Our numerical experiments demonstrate that a very steep topographic gradient, such as the eastern Tibetan margin, is an inherent characteristic of convergence between a hot and weak lithosphere with thick crust and a cold and strong lithosphere with thin crust. Although lower-crustal flow has potentially contributed to the crustal thickness difference between the two convergent blocks, it is not a prerequisite for the growth of steep convergent intracontinental margin. Rather, the topography at the margin can be explained by a near isostatic response to crustal thickening resulting from shortening. © 2013 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879896441&doi=10.1002%2fgrl.50446&partnerID=40&md5=dff71e91cee85df170be2f55c43f657d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6320
Appears in Collections: 气候减缓与适应
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作者单位: State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beitucheng West Road No. 19, Chaoyang District, Beijing, China
Recommended Citation:
Chen L.,Gerya T.V.,Zhang Z.-J.,et al. Formation mechanism of steep convergent intracontinental margins: Insights from numerical modeling[J]. Geophysical Research Letters,2013-01-01,40(10).