Seismic Evidence for Lateral Asthenospheric Flow Beneath the Northeastern Tibetan Plateau Derived From <i>S</i> Receiver Functions

Xu, Qiang; Pei, Shunping; Yuan, Xiaohui; Zhao, Junmeng; Liu, Hongbing; Tu, Hongwei; Chen, Shuze

doi:10.1029/2018gc007986

Cited by 18 publications

(11 citation statements)

References 60 publications

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“…These results indicate that the Moho uplift is not accompanied by considerable crustal thickness changes in the NETP. The results support the interpretation that crustal uplift in the NETP is mainly due to isostatic uplift caused by delamination/convective removal (Deng et al., 2018; Xu et al., 2019; Zheng et al., 2018). These findings are helpful for providing further insights into the growth mechanisms of the Tibetan Plateau.…”

Section: Discussionsupporting

confidence: 85%

Moho Changes Beneath the Northeastern Tibetan Plateau Revealed by Multiple Geodetic Datasets

Zhang

Shen

et al. 2021

JGR Solid Earth

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Summary The Moho interface depths and variations provide important references to understanding the outward growth and expansion mechanisms of the Tibetan Plateau, which have drawn much attention. Here, we constrain the Moho variations beneath the northeastern Tibetan Plateau (NETP) by using multiple geodetic data and climate models. Hydrological and tectonic gravitational signals are identified from multisource data and removed from the satellite gravity observations. Moreover, the mass variation rate, resulting from vertical Moho changes is calculated. The result shows that the mass variation rate due to the Moho changes is 1.3 ± 0.6 mm/yr (equivalent water height) within the NETP, which corresponds to a Moho uplift rate of 2.7 ± 1.3 mm/yr. Additionally, we calculate the tectonic Earth surface uplift rate from GPS and leveling observations with loading and GIA (glacier isostatic adjustment) influence corrected, which gives an uplift rate of 2.2 ± 0.1 mm/yr and is similar with the Moho uplift rate. Our results indicate that the crust in the NETP is uplifted with a slight decrease in crustal thickness. Combined with the lithospheric structure from seismological tomography studies, we suggest that the crustal uplift of the NETP is mainly caused by isostatic adjustment since the delamination of the thickened lithosphere.

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Section: Discussionsupporting

confidence: 85%

Moho Changes Beneath the Northeastern Tibetan Plateau Revealed by Multiple Geodetic Datasets

Zhang

Shen

et al. 2021

JGR Solid Earth

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“…Furthermore, it is noteworthy that a generally thinned lithosphere is found beneath the Songpan‐Ganzi (~110 km). The coexistence of thick and thin lithosphere beneath NE Tibet revealed by the present and previous recent receiver function studies (e.g., Xu et al, 2019; Ye et al, 2015) may imply that the overthickened lithosphere could have been subsequently removed by processes like delamination. Recent seismic tomographic studies revealed broad high velocity in the deeper upper mantle beneath the Tibetan Plateau (Chen et al, 2017; Xiao et al, 2020), which is likely a result of delamination of overthickened lithosphere.…”

Section: Discussionsupporting

confidence: 54%

“…Furthermore, it is noteworthy that a generally thinned lithosphere is found beneath the Songpan-Ganzi (~110 km). The coexistence of thick and thin lithosphere beneath NE Tibet revealed by the present and previous recent receiver function studies (e.g., Xu et al, 2019;Ye et al, 2015) may imply that the overthickened lithosphere could have been subsequently removed by processes like delamination.…”

Section: 1029/2020gl088972supporting

confidence: 54%

“…However, the actual dynamics that produces Tibetan uplift is still debated. Another hotly debated topic is whether the Asian lithospheric mantle subducts southward beneath northern Tibet along reactivated major faults in response to the continuous convergence and whether this controls the large-scale deformation of NE Tibet (Feng et al, 2014;Kind et al, 2002;Liang et al, 2012;Meyer et al, 1998;Shen et al, 2015;Tapponnier et al, 2001;Xiao et al, 2020;Xu et al, 2019;Ye et al, 2015;Yue et al, 2012;Zhao et al, 2010Zhao et al, , 2011.…”

Section: Introductionmentioning

confidence: 99%

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Lithospheric Thickening Controls the Ongoing Growth of Northeastern Tibetan Plateau: Evidence From P and S Receiver Functions

Zhang

Guo

Chen

2020

Geophysical Research Letters

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We determined the lithospheric structure of northeastern Tibet using a receiver function study along a long north‐south profile. Our most important finding is that significant lithospheric thickening is observed beneath the growing northeastern Tibetan plateau, while the lithosphere is relatively thin beneath the well‐developed portions of Tibetan Plateau and Asian continent. These observations also detect a contrasting lithospheric structure across the South Qilian suture. Abrupt steps in the Moho and lithosphere‐asthenosphere boundary across this suture indicate that the South Qilian suture is a major tectonic boundary that might cut through the entire lithosphere. This study shows the importance of mantle lithospheric thickening in controlling the growth of Tibetan Plateau.

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“…Lateral mantle flow from northeastern Tibet to Alxa has been proposed according to the depth variation of the lithosphere‐asthenosphere boundary by receiver function analysis (Shen et al, ; Xu et al, ). A thicker high‐velocity layer beneath the Qaidam Basin contrasts sharply with a thinner high‐velocity layer beneath the Qilianshan Orogen (QL) as well as Alxa (Profiles H, I, and J).…”

Section: Resultsmentioning

confidence: 99%

Seismic Structure Beneath the Tibetan Plateau From Iterative Finite‐Frequency Tomography Based on ChinArray: New Insights Into the Indo‐Asian Collision

et al. 2020

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Indo‐Asian continental collision has contributed to the growth of the Tibetan Plateau, which is one of the most prominent uplifts worldwide since Cenozoic. The crustal and upper‐mantle structures are key factors in understanding the evolutionary process as well as lateral growth of the plateau. We present a new 3‐D seismic model beneath the Tibetan Plateau and its surrounding areas, which uses a large‐scale dense array from iterative finite‐frequency tomography. The new tomographic images show obvious east‐west geometrical change of the northward Indian lithosphere by high‐velocity anomalies beneath Tibet. The high‐velocity anomaly extends to Pamir in the western side, but it only reaches north Lhasa in central and eastern Tibet. A convective removal of the thickened Tibetan lithosphere is observed as a high‐velocity anomaly, followed by a subvertical subduction of the Indian mantle lithosphere beneath the Bangong‐Nujiang Suture in central Tibet. We speculate its link to the widespread magmatism and rapid uplift of central Tibet in late Miocene. A high‐velocity gap between 100 and 250 km underneath the Longmenshan fault indicates that lithospheric delamination may play an important role in surface evolution between eastern Tibet and surrounding rigid blocks. Our detailed seismological model will give an insight into how the continents collide.

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Seismic Evidence for Lateral Asthenospheric Flow Beneath the Northeastern Tibetan Plateau Derived From S Receiver Functions

Cited by 18 publications

References 60 publications

Moho Changes Beneath the Northeastern Tibetan Plateau Revealed by Multiple Geodetic Datasets

Moho Changes Beneath the Northeastern Tibetan Plateau Revealed by Multiple Geodetic Datasets

Lithospheric Thickening Controls the Ongoing Growth of Northeastern Tibetan Plateau: Evidence From P and S Receiver Functions

Seismic Structure Beneath the Tibetan Plateau From Iterative Finite‐Frequency Tomography Based on ChinArray: New Insights Into the Indo‐Asian Collision

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