气候变化领域集成服务门户(CCPortal): Asthenospheric upwelling beneath northeastern margin of Ordos Block: Constraints from Rayleigh surface-wave tomography

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DOI	10.1016/j.tecto.2020.228548
	Asthenospheric upwelling beneath northeastern margin of Ordos Block: Constraints from Rayleigh surface-wave tomography
	Yao Z.; Eric S.; Wang C.; Ding Z.; Chen Y.
发表日期	2020
ISSN	00401951
卷号	790
英文摘要	Phase velocities at periods of 20–143 s are inverted from Rayleigh surface waves recorded at 201 stations of permanent and temporary seismic network deployed in the northern Ordos Block. We obtained the shear-wave velocities in the upper mantle from phase velocities. Our velocity models clearly reveal a striking low-velocity anomaly zone in the upper mantle beneath the northeastern margin of the Ordos Block. The low-velocity zone at periods of 50–100 s extends from the north end of the Lüliangshan Mountain to the north border of the western North China Craton. The minimum shear-wave velocity is approximately 4.2 km/s and the minimum lithospheric thickness is approximately 80 km in the low-velocity anomaly zone. Our shear-wave velocity results indicate that lithospheric thinning, asthenospheric upwelling and partial melting may occur in the region during the Cenozoic. High temperature and thinned lithosphere may be significant factors that cause partial melting in the asthenospheric mantle. During the Cenozoic, asthenospheric upwelling may be associated with the lithospheric stretching caused by the extension stress in the northeastern margin of the Ordos Block. The extension stress may be contemporaneous with the regional extension of various stages, which is related to the Pacific subduction and the far-field effect of the Indian-Eurasian collision in the Cenozoic. © 2020 Elsevier B.V.
关键词	Asthenospheric upwelling Ordos Block Rayleigh surface wave Regional extension Upper-mantle structure
英文关键词	Acoustic wave velocity; Melting; Phase velocity; Shear waves; Surface waves; High temperature; Lithospheric thickness; Lithospheric thinning; Low velocity zones; Low-velocity anomaly; North China Craton; Rayleigh surface waves; Shear wave velocity; Shear flow; asthenosphere; Cenozoic; extensional tectonics; lithospheric structure; low velocity zone; partial melting; phase velocity; Rayleigh wave; seismic tomography; seismic velocity; upper mantle; China; North China Block; Ordos Basin
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/207905
作者单位	Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China; Department of Geological Sciences, University of MissouriMO 65211, United States; Southern University of Science and TechnologyGuangdong 518055, China
推荐引用方式 GB/T 7714	Yao Z.,Eric S.,Wang C.,et al. Asthenospheric upwelling beneath northeastern margin of Ordos Block: Constraints from Rayleigh surface-wave tomography[J],2020,790.
APA	Yao Z.,Eric S.,Wang C.,Ding Z.,&Chen Y..(2020).Asthenospheric upwelling beneath northeastern margin of Ordos Block: Constraints from Rayleigh surface-wave tomography.Tectonophysics,790.
MLA	Yao Z.,et al."Asthenospheric upwelling beneath northeastern margin of Ordos Block: Constraints from Rayleigh surface-wave tomography".Tectonophysics 790(2020).