DOI: 10.1016/j.epsl.2020.116270
论文题名: Role of erosion in creating thrust recesses in a critical-taper wedge: An example from Eastern Tibet
作者: Liu Y. ; Tan X. ; Ye Y. ; Zhou C. ; Lu R. ; Murphy M.A. ; Xu X. ; Suppe J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 540 语种: 英语
中文关键词: critical-taper wedge
; East Tibet
; erosion
; Longmen Shan
; recess
英文关键词: Deformation
; Geometry
; Erosion patterns
; Fault-related fold
; Forward propagation
; Independent variables
; Intrinsic property
; Spatial correlations
; Theoretical modeling
; Thrust belt deformation
; Erosion
; accretionary prism
; continental margin
; deformation
; fold and thrust belt
; morphometry
; structural geology
; China
; Qinghai-Xizang Plateau
英文摘要: Mechanical models and analog experiments show that erosion plays an important role in controlling along-strike variations in thrust-belt deformation. Despite this fundamental insight, natural examples of focused erosion causing local variations of thrust-belt geometry, such as the formation of salients and recesses, remain underappreciated. In this study, we address this issue by integrating theoretical model predictions with structural, morphological, and erosion-pattern analyses along the thrust system defining the eastern margin of the Tibetan Plateau. Our work shows a nearly constant surface slope across and an overall cylindrical fault-related fold geometry along the thrust belt. These phenomena can be explained by the development of a critically-tapered thrust wedge along the plateau margin. A prominent recess exists at the intersection between the transverse Minjiang River and the range-bounding thrust. There, the surface trace displays a much higher curvature than the rest of the thrust belt and the local fold geometry is conical rather than cylindrical. We infer a warped passive-roof duplex under the recess. We build a classification diagram for recesses developing in critical-taper wedges, in which six independent variables lead to three morphotectonic scenarios regarding the effects of mass influx, mass efflux, and intrinsic properties of a thrust wedge. Formation of the Dujiangyan recess and its spatial correlation to the Minjiang River can be best attributed to localized fluvial erosion during forward propagation of the thrust wedge in eastern Tibet. This study sets a type example for map-view curves in thrust belts undergoing deformation-erosion interactions. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165130
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX 77204, United States; State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, 100029, China; Institute of Crustal Dynamics, China Earthquake Administration, Beijing, 100085, China
Recommended Citation:
Liu Y.,Tan X.,Ye Y.,et al. Role of erosion in creating thrust recesses in a critical-taper wedge: An example from Eastern Tibet[J]. Earth and Planetary Science Letters,2020-01-01,540