首页|Crustal thickness (H) and Vp/Vs ratio (kappa) images beneath the central Tien Shan revealed by the H-kappa-c method

Crustal thickness (H) and Vp/Vs ratio (kappa) images beneath the central Tien Shan revealed by the H-kappa-c method

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  • NSTL
  • Elsevier
As an active intracontinental omgenic belt within the far field influence of the India-Eurasia collision, the Tien Shan is a natural laboratory to study the mechanisms of the large-scale mountain building. In this study, we image crustal seismic structures beneath the central Tien Shan using the H-kappa-c method with the harmonic corrections on Ps and its crustal multiples (PpPs, PpSs + PsPs) in P-wave receiver functions (RFs). The RFs are calculated from three-component seismograms recorded by 43 broadband stations located in central Tien Shan and surrounding areas. The robust and high-resolution images of the crustal thickness (H) and average Vp/Vs ratio (kappa) are finally obtained. From our observations, the crustal thickness beneath the central Tien Shan is larger (50- 65 km) than those beneath the Kazakh Shield (similar to 45 km) and Tarim Basin (similar to 42 km). The x image denotes a general distribution of kappa which is higher than 1.73 in most parts of the central Tien Shan, as well as the margins of the Kazakh Shield and Tarim Basin, while lower than 1.73 only in some sporadic areas of this orogenic belt. Our seismic results suggest the complex intracontinental collision with the inhomogeneous crustal thickening in the mountain building. Moreover, the kappa image implies the partial melting within the crust beneath the central Tien Shan. Combining with previous seismic studies, we infer that the magmatic intrusion of the hot upwelling mantle materials induces the partial melts within the crust, and also contributes to the rejuvenation of the Tien Shan orogenic belt.

Central Tien ShanCrustal thicknessAverage crustal Vp/Vs ratio (kappa)Intracontinental collisionPartial meltingH-kappa-c methodCENOZOIC TECTONIC EVOLUTIONRECEIVER-FUNCTIONDISCONTINUITY BENEATHVELOCITY STRUCTURETIAN-SHANMANTLEANISOTROPYDEFORMATIONTOMOGRAPHYWESTERN

Cui, Qinghui、Zhou, Yuanze、Li, Jiangtao、Song, Xiaodong、Gao, Yuan、Cui, Ran

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China Earthquake Adm

Univ Chinese Acad Sci

Wuhan Univ

Peking Univ

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2022

10.1016/j.tecto.2021.229157

Tectonophysics

Tectonophysics

EISCI
ISSN：0040-1951
年,卷(期)：2022.822
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