Asthenospheric upwelling beneath northeastern margin of Ordos Block: Constraints from Rayleigh surface-wave tomography

Yao，Zhixiang1; Eric，Sandvol2; Wang，Chunyong1; Ding，Zhifeng1; Chen，Yongshun3

2020-09-05

10.1016/j.tecto.2020.228548

TECTONOPHYSICS   影响因子和分区

0040-1951

1879-3266

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.

Asthenospheric upwelling Ordos Block Rayleigh surface wave Regional extension Upper-mantle structure

SCI ; EI

英语

其他

National Natural Science Foundation of China[90914005][41304044] ; Special Program of the Ministry of Science and Technology of China[2006FY110100]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000566670400007

ELSEVIER

20202708903789

Surface waves ; Acoustic wave velocity ; Shear waves ; Melting ; Structural geology ; Phase velocity

Geology:481.1 ; Fluid Flow, General:631.1 ; Electromagnetic Waves in Different Media:711.1 ; Acoustic Waves:751.1 ; Chemical Operations:802.3 ; Mechanics:931.1

GEOSCIENCES

2-s2.0-85087334753

Scopus

1.Institute of Geophysics,China Earthquake Administration,Beijing,100081,China
2.Department of Geological Sciences,University of Missouri,65211,United States
3.Southern University of Science and Technology,518055,China

Yao，Zhixiang,Eric，Sandvol,Wang，Chunyong,et al. Asthenospheric upwelling beneath northeastern margin of Ordos Block: Constraints from Rayleigh surface-wave tomography[J]. TECTONOPHYSICS,2020,790.

Yao，Zhixiang,Eric，Sandvol,Wang，Chunyong,Ding，Zhifeng,&Chen，Yongshun.(2020).Asthenospheric upwelling beneath northeastern margin of Ordos Block: Constraints from Rayleigh surface-wave tomography.TECTONOPHYSICS,790.

Yao，Zhixiang,et al."Asthenospheric upwelling beneath northeastern margin of Ordos Block: Constraints from Rayleigh surface-wave tomography".TECTONOPHYSICS 790(2020).