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DOI	10.1016/j.epsl.2020.116270
	Role of erosion in creating thrust recesses in a critical-taper wedge: An example from Eastern Tibet
	Liu Y.; Tan X.; Ye Y.; Zhou C.; Lu R.; Murphy M.A.; Xu X.; Suppe J.
发表日期	2020
ISSN	0012821X
卷号	540
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202752
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
推荐引用方式 GB/T 7714	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],2020,540.
APA	Liu Y..,Tan X..,Ye Y..,Zhou C..,Lu R..,...&Suppe J..(2020).Role of erosion in creating thrust recesses in a critical-taper wedge: An example from Eastern Tibet.Earth and Planetary Science Letters,540.
MLA	Liu Y.,et al."Role of erosion in creating thrust recesses in a critical-taper wedge: An example from Eastern Tibet".Earth and Planetary Science Letters 540(2020).