DOI: 10.1016/j.tecto.2021.228871
论文题名: Role of the Early Miocene Jinhe-Qinghe Thrust Belt in the building of the Southeastern Tibetan Plateau topography
作者: Zhu C. ; Wang G. ; Leloup P.H. ; Cao K. ; Mahéo G. ; Chen Y. ; Zhang P. ; Shen T. ; Wu G. ; Sotiriou P. ; Wu B.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 811 语种: 英语
中文关键词: Jinhe-Qinghe thrust belt
; Low-temperature thermochronology
; Oligocene-Miocene thrusting
; Southeast Tibet
英文关键词: Chemical activation
; Faulting
; Fission reactions
; Phosphate minerals
; Exhumation rates
; Geodynamic process
; Late Oligocene
; Re-activation
; Single mechanisms
; Thermal model
; Tibetan Plateau
; Xianshuihe fault
; Topography
; exhumation
; geodynamics
; low temperature
; Miocene
; Oligocene
; plateau
; relief
; thermochronology
; thrust fault
; China
; Indochina
; Qinghai-Xizang Plateau
; Xizang
英文摘要: Understanding the role of southeastern Tibetan thrust faults in the development of plateau topography is key to our assessment of the geodynamic processes shaping continental topography. Detailed structural analysis along the ~400 km long Jinhe-Qinghe thrust belt (JQTB) indicates post Late Eocene thrust motion with a minor left-lateral component, inducing ~0.6 to 3.6 km of apparent vertical offset across the fault. The exhumation history of the Baishagou granite, based on thermal modeling of new apatite (U[sbnd]Th)/He and fission-track results, suggests an accelerated exhumation rate (~0.4 km/Myr) between 20 and 16 Ma, corresponding to ~1.7–2.4 km of exhumation. We interpret this fast exhumation as a manifestation of the activation of the Nibi thrust, a northern branch of the JQTB, resulting in the creation of significant relief across the JQTB in the Early Miocene. When compared with previous studies, our findings show that Cenozoic exhumation and relief creation in southeastern Tibet cannot be explained by a single mechanism. Rather, at least three stages of relief creation should be invoked. The first phase is Eocene NE-SW compression partly coeval with Eocene sedimentation. During the Late Oligocene to Early Miocene and coeval with the extrusion of Indochina, the second thrusting phase occurred along the Yulong and Longmenshan thrust belts, and then migrated to the JQTB at 20–16 Ma. The third phase involved the activation of the Xianshuihe fault and the re-activation of the Longmenshan thrust belt and the Muli thrust. Uplift in the hanging wall of thrust belts appears to explain most of the present-day relief in the southeastern Tibetan Plateau. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170949
Appears in Collections: 气候变化与战略
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作者单位: Center for Global Tectonics, School of Earth Sciences, China University of Geosciences, Wuhan, China; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, China; Université de Lyon, UCBL, ENSL, CNRS, Laboratoire de Géologie de Lyon: Terre, Planètes et Environnement, Villeurbanne, 69622, France; School of the Environment, University of Windsor, Windsor, ON N9B 3P4, Canada; China Earthquake Disaster Prevention Center, Beijing, 100019, China
Recommended Citation:
Zhu C.,Wang G.,Leloup P.H.,et al. Role of the Early Miocene Jinhe-Qinghe Thrust Belt in the building of the Southeastern Tibetan Plateau topography[J]. Tectonophysics,2021-01-01,811