globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2020.228548
论文题名:
Asthenospheric upwelling beneath northeastern margin of Ordos Block: Constraints from Rayleigh surface-wave tomography
作者: Yao Z.; Eric S.; Wang C.; Ding Z.; Chen Y.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 790
语种: 英语
中文关键词: 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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170738
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Yao Z.,Eric S.,Wang C.,et al. Asthenospheric upwelling beneath northeastern margin of Ordos Block: Constraints from Rayleigh surface-wave tomography[J]. Tectonophysics,2020-01-01,790
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