DOI: 10.1016/j.tecto.2020.228545
论文题名: Quantification of the late Quaternary throw rates along the Yadong rift, southern Tibet
作者: Wang S. ; Chevalier M.-L. ; Pan J. ; Bai M. ; Li K. ; Li H. ; Wang G.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 790 语种: 英语
中文关键词: Active tectonics
; Cosmogenic isotope dating
; Extension rate
; Southern Tibet
; Throw rate
; Yadong rift
英文关键词: Kinematics
; Luminescence
; Extension rates
; Optically stimulated luminescence
; Seismic hazards
; Surface exposure age
; Tectonic evolution
; Terrestrial lidars
; Tibetan Plateau
; U-series dating
; Fault slips
; geochronology
; geomorphology
; kinematics
; Quaternary
; remote sensing
; rift zone
; seismic hazard
; tectonic evolution
; China
; Xizang
; Yadong
英文摘要: Southern Tibet is characterized by seven main N-S trending rifts bounded by normal faults which accommodate E-W extension. Quantifying the throw and extension rates along these rifts is essential to understand their activity, onset timing, regional seismic hazard and kinematic role in the tectonic evolution of the Tibetan Plateau. The Yadong-Gulu rift (YGR), near Lhasa, is the longest and most prominent rift in southern Tibet, and one of the few that crosses the Himalayas, however it remains poorly studied and understood. Here, we focus on the Yadong rift, i.e., the southern section of the YGR, south of the Yarlung Zangbo suture. We determine the late Quaternary/Holocene throw rates at four sites, where the active Yadong normal fault vertically offsets glacial and fluvial geomorphic surfaces. Using terrestrial LiDAR, UAV and kinematic GPS, we precisely measured vertical offsets (up to 17 m) and constrained the age of abandoned surfaces using 32 10Be cosmogenic surface-exposure ages (~10–20 ka), one optically stimulated luminescence age and two travertine samples dated using U-series dating. The offset-age reconstructions yield uniform throw rates of 0.9 ± 0.3 mm/yr along the entire Yadong rift. Taking a fault dip of 50° as measured in the field, we obtain late Quaternary E-W extension rates of 0.8 ± 0.3 mm/yr, which is similar to but at the lower end of those along other rifts in southern Tibet (~1–2 mm/yr). © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170728
Appears in Collections: 气候变化与战略
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作者单位: School of Earth Sciences and Resources, China University of Geosciences, 29 Xueyuan Rd, Beijing, Beijing 100083, China; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Rd, Beijing, 100037, China
Recommended Citation:
Wang S.,Chevalier M.-L.,Pan J.,et al. Quantification of the late Quaternary throw rates along the Yadong rift, southern Tibet[J]. Tectonophysics,2020-01-01,790