气候变化领域集成服务门户(CCPortal): The formation of the Dabashan orocline, central China: Insights from high-resolution 3D crustal shear-wave velocity structure

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DOI	10.1016/j.tecto.2019.228244
	The formation of the Dabashan orocline, central China: Insights from high-resolution 3D crustal shear-wave velocity structure
	Luo S.; Huang R.; Zhu L.; Yao H.
发表日期	2020
ISSN	00401951
卷号	774
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.
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
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207818
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
推荐引用方式 GB/T 7714	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],2020,774.
APA	Luo S.,Huang R.,Zhu L.,&Yao H..(2020).The formation of the Dabashan orocline, central China: Insights from high-resolution 3D crustal shear-wave velocity structure.Tectonophysics,774.
MLA	Luo S.,et al."The formation of the Dabashan orocline, central China: Insights from high-resolution 3D crustal shear-wave velocity structure".Tectonophysics 774(2020).