globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2019.228244
论文题名:
The formation of the Dabashan orocline, central China: Insights from high-resolution 3D crustal shear-wave velocity structure
作者: Luo S.; Huang R.; Zhu L.; Yao H.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 774
语种: 英语
中文关键词: Ambient noise ; Crustal structure ; Dabashan orocline ; Geodynamics ; Surface wave
英文关键词: Acoustic wave velocity ; Domes ; Geodynamics ; Plates (structural components) ; Seismic waves ; Shear waves ; Structural geology ; Surface waves ; Travel time ; Wave propagation ; Ambient noise ; Crustal structure ; Low-velocity anomaly ; Orocline ; S-wave velocity structure ; Shear wave (S wave) ; Shear wave velocity structure ; Threedimensional (3-d) ; Shear flow ; accretion ; ambient noise ; crustal structure ; geodynamics ; orogenic belt ; P-wave ; S-wave ; surface wave ; velocity structure ; wave velocity ; China ; Daba Mountains
英文摘要: The Dabashan orocline is a large thrust belt in central China. Determination of its high-resolution three-dimensional (3D) crustal shear-wave (S-wave) velocity structure can enhance our understanding of the intracontinental evolution of the South China plate and North China plate. In this study, we estimated the Rayleigh wave phase and group velocities at periods of 5–50 s, P-wave receiver functions, and Ps and SsPmp travel times from 63 permanent stations and 29 portable stations; we also constructed a 3D S-wave velocity model and crustal thickness and Vp/Vs ratio maps of the Dabashan orocline and adjacent areas. The crustal thickness and Vp/Vs ratio maps show prominent thick crust (50–55 km) and high Vp/Vs ratios (1.8–1.85), suggesting a mafic lower crust in the Dabashan orocline. The 3D S-wave velocity structure shows northeast-dipping low-velocity anomalies in the upper crust of the Dabashan orocline, and high velocities extended from near the surface to the lower crust in the Hannan-Micang and Shennong-Huangling domes, suggesting deep roots of the two domes. We propose that the two domes acted as rigid indenters and rotated clockwise together with the South China plate, penetrating into the Qinling-Dabie orogenic belt. Weak sediments in the upper crust of the Dabashan orocline were compressed and blocked by the two domes and the rigid Qinling-Dabie orogenic belt, resulting in vertical accretion of the sediments and crust and subsequent formation of the northeast-dipping low-velocity anomalies and the thick crust beneath the Dabashan orocline. © 2019 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170651
Appears in Collections:气候变化与战略

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作者单位: Laboratory of Seismology and Physics of the Earth's Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China; Hubei Subsurface Multi-scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, 430074, China; Department of Earth and Atmospheric Sciences, Saint Louis University, St. Louis, MO 63108, United States

Recommended Citation:
Luo S.,Huang R.,Zhu L.,et al. The formation of the Dabashan orocline, central China: Insights from high-resolution 3D crustal shear-wave velocity structure[J]. Tectonophysics,2020-01-01,774
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