A Generalized Strategy From S‐Wave Receiver Functions Reveals Distinct Lateral Variations of Lithospheric Thickness in Southeastern Tibet

Zhang, Zhou; Deng, Yangfan

doi:10.1029/2022gc010619

Cited by 5 publications

(2 citation statements)

References 124 publications

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“…In this case, both the retreat of the Indian slab and lithospheric delamination of the western Yangtze might cause asthenosphere upwelling between the EHS and western Yangtze, which might be observed as the mushroomshaped LVZ. The asthenosphere upwelling and lithospheric delamination could explain the lateral variation of the LAB depth (Zhang et al, 2010;Zhang and Deng, 2022), the localized crust-mantle low velocity and weak azimuthal anisotropy (Bao et al, 2020) as well as the depressed 660-km discontinuity observed beneath the eastern margin of the Tibetan Plateau (Figure 6). Consequently, convergence between the eastern Tibetan Plateau and western Yangtze Craton would be accommodated in the upper crust dominantly by pure-shear thickening above the zone of mantle upwelling, and the crustal deformation will be characterized by contraction at the plateau margins and extension within the plateau (Gray and Pysklywec, 2012).…”

Section: Lithospheric Delamination and Asthenosphere Upwelling Beneat...mentioning

confidence: 99%

Dense-array adjoint tomography reveals lithospheric delamination and asthenosphere upwelling beneath the western Yangtze Craton

et al. 2023

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The eastern Tibetan Plateau has attracted widespread attention due to its complex topography and strong seismicity. However, the mechanism controlling the growth of this margin remains enigmatic. Here, we present detailed upper mantle structures of the easternmost and northeastern Tibetan Plateau from dense-array adjoint waveform tomography. The seismic images show mushroom-shaped low-velocity zones atop at the uppermost mantle of the eastern margin of the Tibetan Plateau and slab-shaped high-velocity bodies preserved beneath both the eastern Himalayan syntaxis and the western Sichuan basin. The seismic features suggest asthenosphere upwelling and lithospheric delamination beneath the western Yangtze Craton, which might be induced by the retreat of the subducted Indian Plate. Our study shows that the mantle dynamics of the western Yangtze Craton have played an important role in the Tibetan Plateau growth and suggests that the Yangtze Craton might be reconstructed by ongoing continental collision.

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Section: Lithospheric Delamination and Asthenosphere Upwelling Beneat...mentioning

confidence: 99%

Dense-array adjoint tomography reveals lithospheric delamination and asthenosphere upwelling beneath the western Yangtze Craton

et al. 2023

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“…Since the deployment of seismic arrays by international collaborative projects such as PASS-CAL, INDEPTH, and HiCLIMB during the last few decades, many investigations have been conducted to obtain further insight into the evolution processes and small-scale deep structures of the Himalayan-Tibetan orogen [27][28][29][30][31][32][33]. In addition, much seismological research has been conducted in the Tibetan Plateau over the past decade, such as deep seismic soundings [34][35][36][37], seismic tomography [38][39][40][41][42][43][44][45][46], and teleseismic receiver functions [47][48][49][50][51]. However, most of the previous studies paid much more attention to southeastern Tibet and there are few studies on the detailed 3D velocity structure of the upper mantle beneath the YTS due to the limitations of the available seismic data.…”

Section: Introductionmentioning

confidence: 99%

Upper Mantle Velocity Structure Beneath the Yarlung–Tsangpo Suture Revealed by Teleseismic P-Wave Tomography

Yan,

Tian,

et al. 2023

Remote Sensing

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We applied teleseismic tomography to investigate the 3D P-wave velocity (Vp) structure of the crust and upper mantle at depths of 50–400 km beneath the Yarlung–Tsangpo suture (YTS), by using 6164 P-wave relative travel-time residuals collected from 495 teleseismic events recorded at 20 three-component broadband seismograms. A modified multi-channel cross-correlation method was adopted to automatically calculate the relative arrival-time residuals of all teleseismic events, which significantly improved the efficiency and precision of the arrival-time data collection. Our results show that alternating low- and high-Vp anomalies are visible beneath the Himalayan and Lhasa blocks across the YTS, indicating that strong lateral heterogeneities exist beneath the study region. A significant high-Vp zone is visible beneath the southern edge of the Lhasa block at 50–100 km depths close to the YTS, which might indicate the rigid Tibetan lithosphere basement. There exists a prominent low-Vp zone beneath the Himalayan block to the south of the YTS extending to ~150 km depth, which might be associated with the fragmentation of the underthrusting Indian continental lithosphere (ICL) and induce localized upwelling of asthenospheric materials from the upper mantle. In addition, significant low-Vp anomalies were observed beneath the Yadong–Gulu rift and the Cona–Sangri rift extending to ~300 km depth, indicating that the tearing of the subducted ICL might provide pathways for the localized asthenospheric materials upwelling, which contributes to the widespread distribution of north–south trending rifts and geothermal activities in southern Tibet.

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Intracontinental lithospheric delamination: Constraints from imaging the mantle transition zone beneath the southwestern part of the Sichuan Basin

Yang,

Li,

Chen

et al. 2023

Sci. China Earth Sci.

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A Generalized Strategy From S‐Wave Receiver Functions Reveals Distinct Lateral Variations of Lithospheric Thickness in Southeastern Tibet

Cited by 5 publications

References 124 publications

Dense-array adjoint tomography reveals lithospheric delamination and asthenosphere upwelling beneath the western Yangtze Craton

Dense-array adjoint tomography reveals lithospheric delamination and asthenosphere upwelling beneath the western Yangtze Craton

Upper Mantle Velocity Structure Beneath the Yarlung–Tsangpo Suture Revealed by Teleseismic P-Wave Tomography

Intracontinental lithospheric delamination: Constraints from imaging the mantle transition zone beneath the southwestern part of the Sichuan Basin

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