Seismic structure in the southeastern China using teleseismic receiver functions

Li, Qiusheng; Gao, Rui; Wu, Francis T.; Guan, Yisheng; Ye, Zhuo; Liu, Qimin; Kuo-Chen, Hao; He, Rizheng; Li, Wenhui; Shen, Xuzhang

doi:10.1016/j.tecto.2013.06.033

Cited by 45 publications

(32 citation statements)

References 61 publications

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“…The Moho topography is obtained from the systematic receiver function analysis study using permanent broadband seismic stations throughout the continental China (He et al, ). A thinned SW–NE crustal strip of about 1,400 km long in our study area is observed (Figure a; He et al, ), which is similar to the previous results (Li et al, ).…”

Section: Data and Resultssupporting

confidence: 92%

Crustal Footprint of the Hainan Plume Beneath Southeast China

et al. 2018

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Although global and regional seismic tomography results have revealed the presence of a mantle plume beneath Hainan Island, there is little evidence for a hotspot track associated with the Hainan plume. Here a joint inversion of satellite gravity measurements and seismic surface wave dispersion data was performed, and the results show that a linear corridor of high seismic velocity anomalies beneath the crust is located northeast of Hainan Island beneath the Southeast China. Geodynamic modeling further demonstrates that this corridor could have been formed by the interactions between a mantle plume and the continental lithosphere with a weak lower crust. Volcanic age distributions of sporadic oceanic island basalts suggest that this track was likely formed since the late Cretaceous, which helps to constrain the averaged plate velocity of the South China Block, relative to the Hainan plume, to be ~1.8 cm/year to the northeast since 80 Ma. Our result provides a novel explanation for the crustal thickness variations, related Vs anomalies, and observed oceanic island basalts in this area. It also provides an independent way for constraining plate motion history of the continental lithosphere.

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Section: Data and Resultssupporting

confidence: 92%

Crustal Footprint of the Hainan Plume Beneath Southeast China

et al. 2018

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“…Thus, it is difficult to obtain the extra ~100‐160 K in the MTZ to explain the sharp velocity jump across the 660 beneath southeastern China, which is far from the center of the Hainan plume. A receiver function study (Li, Gao, et al, ) also shows a close to normal 660 topography in our study area, suggesting a normal temperature for the upper mantle. Additionally, it may be difficult to produce such a sharp temperature gradient across the 660 dynamically.…”

Section: Discussionsupporting

confidence: 75%

Fine Structure of the 660‐km Discontinuity Beneath Southeastern China

Zhang

Sun

et al. 2019

Geophysical Research Letters

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Imaging the structure of the 660‐km discontinuity is crucial to understanding the thermal and compositional states of the mantle transition zone. Here we study triplication data sampling beneath southeastern China and observe strong arrivals with rays turning at top of the lower mantle at an epicentral distance of 10°. Such strong arrivals indicate that the S velocity at the discontinuity increases by ~8.2±0.5% over less than 10 km. This sharp 660‐km discontinuity suggests that harzburgite enrichment exists at the bottom of the 660‐km discontinuity and the temperature near 660 km does not exceed 2000 K. Through comparisons with 1‐D models for other regions, we find that the seismic structure in the mantle transition zone below our study area is similar to that beneath oceanic regions. Thus, we suggest that the mantle near the 660‐km discontinuity beneath southeastern China is locally not affected by slab or plume.

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“…A large‐scale upwelling would require thicker lithosphere in this region, but this would contradict seismological investigations. Chen et al () and Zheng et al () have reported low lithospheric thickness (60–70 km) in ENCC, and Q. Li et al () and Zheng et al () have observed thin lithosphere in southeastern south China. Therefore, we suggest that the impact of this upwelling on the surface elevation appears to be minor.…”

Section: Discussionmentioning

confidence: 98%

Lithospheric Alteration, Intraplate Crustal Deformation, and Topography in Eastern China

Deng

Levandowski

2018

Tectonics

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Topography can be directly observed, but what controls topographic variation is not readily known. To investigate a prominent and remarkably consistent along‐trend topographic gradient belt (TGB) in intraplate eastern China and its connection to ongoing deformation and geodynamics, we examine the regional density structure of the crust and mantle lithosphere. We first use S velocities to derive an initial density and then refine the density model by joint inversion of topography and gravity. We use the final density model and receiver functions to strip away topographic contributions from the crust, and we subsequently estimate the thickness of the mantle lithosphere required to satisfy flexural isostasy. Crustal buoyancy overcompensates for the elevation change across the TGB. East of the TGB (eastern north China craton and southeastern south China), the lithosphere is thin (~ 90 km), suggesting that not only the eastern north China craton but also much of the eastern China has experienced lithospheric dismemberment. The TGB behaves as an important contour for the lithospheric thickness, except for the northeast China and Qinling‐Dabie. Proposed refertilization of the altered mantle lithosphere in the east side of TGB would result in even lower lithospheric thickness, while hydration and asthenosphere upwelling have the opposite effect. This systematic calculation gives a regional analysis of eastern China and could be a useful guide for the regions lacking seismic investigations.

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Seismic structure in the southeastern China using teleseismic receiver functions

Cited by 45 publications

References 61 publications

Crustal Footprint of the Hainan Plume Beneath Southeast China

Crustal Footprint of the Hainan Plume Beneath Southeast China

Fine Structure of the 660‐km Discontinuity Beneath Southeastern China

Lithospheric Alteration, Intraplate Crustal Deformation, and Topography in Eastern China

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