DOI: 10.1016/j.tecto.2020.228503
论文题名: Geomorphic expressions of collisional tectonics in the Qilian Shan, north eastern Tibetan Plateau
作者: Groves K. ; Saville C. ; Hurst M.D. ; Jones S.J. ; Song S. ; Allen M.B.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 788 语种: 英语
中文关键词: Fold-and-thrust belts
; Geomorphic indices
; Landscape
; Precipitation
; Qilian Shan
; Tectonics
英文关键词: Deformation
; Erosion
; Surface roughness
; Active deformation
; Eastern Tibetan plateau
; Fold-and-thrust belts
; Geomorphic expression
; Precipitation variation
; Regional landscapes
; Tectonic settings
; Tectonic structure
; Faulting
; convergent margin
; deformation
; detachment fault
; Eurasian plate
; fold and thrust belt
; geomorphology
; Indian plate
; plate tectonics
; tectonic setting
; tectonic structure
; thrust fault
; uplift
; China
; Qilian Mountains
; Qinghai-Xizang Plateau
英文摘要: The Qilian Shan, north eastern Tibetan Plateau, is an area of active deformation caused by convergence in the India-Eurasia collision zone. Geomorphic indices capture the landscape response to competition between tectonics and climate, reflecting the spatial distribution of erosion. We use geomorphic indices (hypsometric integral (HI), normalised channel steepness (ksn), elevation-relief ratio (ZR) and surface roughness (SR)) to identify areas of active deformation and erosion, highlight landscape variations and we interpret the results for potential tectonic and climatic drivers. High HI (> 0.15), ksn (> 100) and low ZR (< 2) occur in the hanging wall of thrust faults, consistent with active uplift of these structures. Relatively high HI (> 0.15) and ksn (> 100) values in the eastern region are attributed to thrust parallel rivers in this region excavating wide valleys between the faults. The east-west precipitation variation across the Qilian Shan (>500 mm/yr to <100 mm/yr) is not a first order control on the regional landscape. There is an abrupt northwards transition from low to high HI, ksn and SR and high to low ZR partially coincident with the left-lateral Haiyuan Fault. We suggest that this transition is due to a difference in deep structure. A south-to-north transition from creeping to locked behaviour on an underlying detachment thrust has previously been suggested to occur along the intersection of this thrust detachment with the overlying Haiyuan Fault, providing a potential explanation for the location of the geomorphic change. Our results show these geomorphic indices to be sensitive to the underlying tectonic structure of the area. These methods could be applied to other fold-and-thrust belts and tectonic settings, to help understand the underlying structure, and the processes responsible for deformation. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170596
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth Sciences, University of Durham, Durham, DH1 3LE, United Kingdom; School of Geographical and Earth Sciences, University of Glasgow, Glasgow, G12 8QQ, United Kingdom; MOE Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing, China
Recommended Citation:
Groves K.,Saville C.,Hurst M.D.,et al. Geomorphic expressions of collisional tectonics in the Qilian Shan, north eastern Tibetan Plateau[J]. Tectonophysics,2020-01-01,788