Lithospheric structure beneath the northeastern Tibetan Plateau and the western Sino-Korea Craton revealed by Rayleigh wave tomography

Li, Yonghua; Pan, Jiatie; Wu, Qingju; Ding, Zhongli

doi:10.1093/gji/ggx181

Cited by 45 publications

(53 citation statements)

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“…A continuous low velocity anomaly in the QOB, an area between the Haiyuan fault and the east Kunlun fault, is generally imaged at periods from 20 to 100 s (Figures a–e). The observation of this low velocity anomaly is consistent with previous Rayleigh wave tomography models (Bao, Song, & Li, ; Li et al, ), while it is partially different from a relatively high velocity in the north QOB obtained from previous Rayleigh and Love wave tomography study (Li et al, , ), which has limited station coverage and crossing ray paths there. The Songpan‐Ganzi terrane (SGT) is characterized by low velocity anomaly at periods less than 50 s (Figures a and b) and relatively high velocity compared with the QOB at periods of 59–100 s. Another interesting feature is the sharp velocity contrast between high phase velocities in the Ordos block (OB) and low phase velocities in the Alxa block (AB) at intermediate‐long periods (>45 s) (Figures c–e).…”

Section: Resultssupporting

confidence: 89%

“…In our 3‐D V SH model, a low velocity anomaly is observed in the midlower crust and can be traced down to uppermost mantle beneath the QOB (Figures d–g and ), consistent with the observations of slow P wave velocity (Lei & Zhao, ) and SV wave velocity (Li et al, , ), and inefficient propagation of high frequency Sn (Barron & Priestley, ). Additionally, a diffuse lithosphere asthenosphere boundary from S receiver function suggests small temperature gradient between mantle lithosphere and asthenosphere (Shen, Yuan, & Liu, ).…”

Section: Discussionsupporting

confidence: 90%

“…A continuous low velocity anomaly in the QOB, an area between the Haiyuan fault and the east Kunlun fault, is generally imaged at periods from 20 to 100 s (Figures 5a-5e). The observation of this low velocity anomaly is consistent with previous Rayleigh wave tomography models (Bao, Song, & Li, 2015;Li et al, 2017), while it is partially different from a relatively high velocity in the north QOB obtained from previous Rayleigh and Love wave tomography study , which has limited station coverage and crossing ray paths there. The Songpan-Ganzi terrane (SGT) is characterized by low velocity anomaly at periods less than 50 s (Figures 5a and 5b .…”

Section: Love Wave Phase Velocitysupporting

confidence: 82%

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Lithospheric SH Wave Velocity Structure Beneath the Northeastern Tibetan Plateau From Love Wave Tomography

Xiao

2019

JGR Solid Earth

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The northeastern (NE) Tibetan plateau has been a prime site to understand the dynamic processes responsible for the rise and lateral growth of the Tibetan plateau. Here we construct a high‐resolution lithospheric scale isotropic SH wave velocity model (down to the depth of 130 km) for the NE Tibetan plateau and its adjacent regions based on the measurements of fundamental‐mode Love wave dispersions (20–100 s) with seismic data recorded by ChinArray II and China Digital Seismic Array using two‐plane wave method. Prominent slow SH wave velocity (VSH) is observed in the midlower crust of the NE Tibetan plateau, specifically in the Qilian Orogenic Belt and the Songpan‐Ganzi Terrane regions, coincident with previously indicated significantly slow SV wave velocity (VSV), probably implying the existence of partial melts in the midlower crust. This low SH wave velocity anomaly could be traced down to the uppermost mantle, indicating a weak and warm lithosphere, which we interpret as a consequence of asthenosphere upwelling after lithospheric mantle removal in the NE Tibetan plateau. The asthenosphere upwelling and associated deep‐seated thermal buoyancy could explain the occurrence of partial melting in the mid‐lower crust and account for parts of high elevations in the NE Tibetan plateau. The western Qinling orogenic belt is characterized with a high velocity anomaly in most of lithosphere, which is inconsistent with the existence of channel flow within the lithosphere along the Qinling orogenic belt from the Tibetan plateau.

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Section: Resultssupporting

confidence: 89%

Section: Discussionsupporting

confidence: 90%

Section: Love Wave Phase Velocitysupporting

confidence: 82%

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Lithospheric SH Wave Velocity Structure Beneath the Northeastern Tibetan Plateau From Love Wave Tomography

Xiao

2019

JGR Solid Earth

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“…Li et al [2013Li et al [ , 2016 suggested that another heat source for the LVZ beneath the KF zone is from asthenosphere upwelling caused by the removal of lithosphere root. The presence of relatively low velocity in upper mantle may account for the mantle flow beneath the WQT [e.g., Guo and Chen, 2017;Li et al, 2016Li et al, , 2017Zheng et al, 2016]. Shear wave splitting measurements also suggested that the asthenosphere mantle flow existed beneath the WQT [e.g., Chang et al, 2017;Yu and Chen, 2016].…”

Section: Origin Of Two Crustal Lvzs In the Northern Sgt Southwesternmentioning

confidence: 99%

Three‐dimensional lithospheric S wave velocity model of the NE Tibetan Plateau and western North China Craton

Xingchen

Ding

et al. 2017

JGR Solid Earth

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We present a new 3‐D lithospheric Vs model for the NE Tibetan Plateau (NETP) and the western North China Craton (NCC). First, high‐frequency receiver functions (RFs) were inverted using the neighborhood algorithm to estimate the sedimentary structure beneath each station. Then a 3D Vs model with unprecedented resolution was constructed by jointly inverting RFs and Rayleigh wave dispersions. A low‐velocity sedimentary layer with thicknesses varying from 2 to 10 km is present in the Yinchuan‐Hetao graben, Ordos block, and western Alxa block. Velocities from the middle‐lower crust to the uppermost mantle are generally high in the Ordos block and low in the Alxa block, indicating that the Alxa block is not part of the NCC. The thickened crust in southwestern Ordos block and western Alxa block suggests that they have been modified. Two crustal low‐velocity zones (LVZs) were detected beneath the Kunlun Fault (KF) zone and western Qilian Terrane (QLT). The origin of the LVZ beneath the KF zone may be the combined effect of shear heating, localized asthenosphere upwelling, and crustal radioactivity. The LVZ in the western QLT, representing an early stage of the LVZ that has developed in the KF zone, acts as a decollement to decouple the deformation between the upper and lower crust and plays a key role in seismogenesis. We propose that the crustal deformation beneath the NETP is accommodated by a combination of shear motion, thickening of the upper‐middle crust, and removal of lower crust.

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“…Most of dispersion data in this study are obtained from local Rayleigh wave tomographic images of NE and SE Tibet (Li, Pan, et al, ; ; Pan et al, ). These local tomography models mainly used earthquake data recorded at the ChinArray seismic stations to produce group and phase velocity maps at periods of 10–60 s and 10–80 s, respectively.…”

Section: Methodsmentioning

confidence: 99%

Variations in Crustal and Uppermost Mantle Structures Across Eastern Tibet and Adjacent Regions: Implications of Crustal Flow and Asthenospheric Upwelling Combined for Expansions of the Tibetan Plateau

Chen

Zhang

et al. 2019

Tectonics

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We present new, high‐resolution constraints on crustal and uppermost mantle structure of the southeastern, eastern, and northeastern Tibetan plateau and adjacent regions by combining extensive data from three regional‐scale dense seismic arrays. Our results show significant differences in the crustal and uppermost mantle structure within the Songpan‐Ganzi terrane. The southern part has a thick crust and high Poisson's ratio, while the crustal thickness becomes less and Poisson's ratio is nearly normal in the northeast. Prominent low‐velocity anomalies appear beneath both the southern and northeastern Songpan‐Ganzi terrane at depths of 20–40 km, but they are not interconnected. Seismic velocities of the uppermost mantle are slow in the northeastern Songpan‐Ganzi terrane relative to the south. We further find that the crust of the central Qilian orogen is thickened but with remarkable low Poisson's ratio. Low velocities are visible in both the mid‐lower crust and uppermost mantle, similar to the northeastern Songpan‐Ganzi terrane. For comparison, the crustal low velocities are less pronounced beneath the central Qilian orogen. High Poisson's ratio and the mid‐lower crustal anomaly of the southern Songpan‐Ganzi terrane strongly indicate partial melting of the crust. Localized asthenospheric upwelling, however, can account for the coincident anomalies in both the mid‐lower crust and uppermost mantle beneath the northeastern Songpan‐Ganzi terrane and central Qilian orogen. We conclude that outward expansion of the Tibetan plateau has evolved by a combination of crustal flow on its southeastern margin and mantle upwelling likely induced by removal of thickened lithosphere on its easternmost and northeastern edges.

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Lithospheric structure beneath the northeastern Tibetan Plateau and the western Sino-Korea Craton revealed by Rayleigh wave tomography

Cited by 45 publications

References 44 publications

Lithospheric SH Wave Velocity Structure Beneath the Northeastern Tibetan Plateau From Love Wave Tomography

Lithospheric SH Wave Velocity Structure Beneath the Northeastern Tibetan Plateau From Love Wave Tomography

Three‐dimensional lithospheric S wave velocity model of the NE Tibetan Plateau and western North China Craton

Variations in Crustal and Uppermost Mantle Structures Across Eastern Tibet and Adjacent Regions: Implications of Crustal Flow and Asthenospheric Upwelling Combined for Expansions of the Tibetan Plateau

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