Crustal structure and composition beneath the northeastern Tibetan plateau from receiver function analysis

Li, Xinfu; Santosh, M.; Cheng, Shujia; Xu, Xiaoming; Wei-xing, Zhong

doi:10.1016/j.pepi.2015.10.001

Cited by 10 publications

(3 citation statements)

References 71 publications

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“…The estimated crustal thicknesses were further interpolated into meshed 0.2°× 0.2°grids of the study area ( Figure 7a). The crustal thickness varies from ∼65 km in the NETP to ∼40 km in the western NCC (Figure 7), which is consistent with previous estimates from the H-κ stacking method [e.g., Li et al, , 2014Li et al, , 2015Pan and Niu, 2011;Tian and Zhang, 2013 . A difference in the Moho depth is observed from the QLT to Alxa block by as much as 10 km across the HF and NQF (Figure 7).…”

Section: Crustal Thicknesssupporting

confidence: 89%

“…The estimated crustal thicknesses were further interpolated into meshed 0.2° × 0.2° grids of the study area (Figure a). The crustal thickness varies from ∼65 km in the NETP to ∼40 km in the western NCC (Figure ), which is consistent with previous estimates from the H ‐ κ stacking method [e.g., Li et al ., , , ; Pan and Niu , ; Tian and Zhang , ; H. Wang et al ., ; Wang et al ., ; X. Wang et al ., ; W. Wang et al ., ; Xu et al ., ; Zheng et al ., ] and active‐source seismic profiles [e.g., Jia et al ., ; Liu et al ., ; Teng et al ., ; C. Y. Wang et al ., ; S. J. Wang et al ., ]. A difference in the Moho depth is observed from the QLT to Alxa block by as much as 10 km across the HF and NQF (Figure ).…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Crustal Thicknesssupporting

confidence: 89%

Section: Resultsmentioning

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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“…One striking feature of Figure b is the low Poisson's ratio ( σ ≤ 0.24) in the junction among the northern Longmen Shan, eastern Kunlun fault, and western Qinling orogenic belt. Poisson's ratio is also rather low beneath the central Qilian orogen, which is consistent with recent receiver function studies (Li et al, ; Zheng et al, ). In contrast, most of the Ordos block and Sichuan basin have moderate‐to‐high Poisson's ratio (~0.27), due to their thick sediments.…”

Section: Resultssupporting

confidence: 90%

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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Complicated crustal deformation beneath the NE margin of the Tibetan plateau and its adjacent areas revealed by multi-station receiver-function gathering

Niu

Ding

et al. 2018

Earth and Planetary Science Letters

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Crustal structure and composition beneath the northeastern Tibetan plateau from receiver function analysis

Cited by 10 publications

References 71 publications

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

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

Complicated crustal deformation beneath the NE margin of the Tibetan plateau and its adjacent areas revealed by multi-station receiver-function gathering

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