Upper mantle and transition zone structure beneath Leizhou–Hainan region: Seismic evidence for a lower-mantle origin of the Hainan plume

Le, Ba Manh; Yang, Ting; Gu, Shenyi

doi:10.1016/j.jseaes.2015.06.008

Cited by 11 publications

(10 citation statements)

References 54 publications

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“…This zone is also home to pervasive Cenozoic volcanisms (Figure c) and is characterized by an apparent depression of the d 410 of about 15–20 km (Figure a). If we assume that the true depth of the d 410 is 410 km, the apparent depression suggests an overall lower‐than‐normal upper mantle and crustal velocities with magnitude of −1.1% to −1.5% [ Gao and Liu , ], a value that is comparable to results from seismic tomography investigations [e.g., Montelli et al , ; Li et al , , ; Wang and Huang , ; Le et al , ; Xia et al , ]. The maximum MTZ thinning of 21 km is found beneath southern Vietnam, corresponding to a thermal anomaly of about +180 K. The amount of thinning in the Hainan area is about 15 km, which is similar to those reported in previous studies covering this area [ Wang and Huang , ; Huang , ; H. Huang et al , ; Wei and Chen , ].…”

Section: Discussionmentioning

confidence: 53%

Mantle transition zone discontinuities beneath the Indochina Peninsula: Implications for slab subduction and mantle upwelling

Gao

Liu

et al. 2017

Geophysical Research Letters

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While the northward indentation of the Indian into Eurasian plates has been intensively investigated, its oblique subduction beneath the Indochina Peninsula (ICP) and the role it played on mantle structure and dynamics remain enigmatic. In this first regional‐scale receiver function study of the mantle transition zone (MTZ) discontinuities beneath the ICP and its surrounding areas, we stack ∼12,000 receiver functions recorded at 33 stations using a non–plane wave common‐conversion‐point stacking technique. Systematic spatial variations of MTZ thickness with departures between −21 and +24 km from the globally averaged value are revealed, providing independent evidence for the presence of slab segments in the MTZ beneath the central and a slab window beneath the western ICP. The results also support the existence of broad mantle upwelling adjacent to the eastern edge of the slab segments, which might be responsible for the widespread Cenozoic volcanisms and pervasively observed upper mantle low velocities in the area.

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Section: Discussionmentioning

confidence: 53%

Mantle transition zone discontinuities beneath the Indochina Peninsula: Implications for slab subduction and mantle upwelling

Gao

Liu

et al. 2017

Geophysical Research Letters

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“…Zhao et al, 2021). These results are supported by a thinned MTZ from receiver function analyses (e.g., C. Wang & Huang, 2012; S. S. Wei & Chen, 2016) and waveform modeling (e.g., Le et al, 2015) under the Hainan Island and surrounding areas. Furthermore, the Hainan plume could have interacted with the subducted Indian and Pacific slabs in the MTZ, when the plume passed through the MTZ (e.g., Lei et al, 2013;Lei & Zhao, 2006;S.…”

Section: Dynamic Processes Of the Hainan Plumementioning

confidence: 58%

“…An increasing number of tomographic results have shown that the Hainan plume originates from the lower mantle (e.g., Z. Huang, Zhao, & Wang, 2015; Lebedev & Nolet, 2003; Lei et al., 2013; Lei & Zhao, 2006; Xia et al., 2016; D. Zhao et al., 2021). This is further supported by receiver function results and waveform modeling displaying a thinned mantle transition zone (MTZ) near the Hainan Island (e.g., Le et al., 2015; C. Wang & Huang, 2012; S. S. Wei & Chen, 2016). However, there are some differences among the tomographic results in the upper mantle under the Hainan region.…”

Section: Introductionmentioning

confidence: 73%

Pn Anisotropic Tomography of Hainan Island and Surrounding Areas: New Insights Into the Hainan Mantle Plume

Lu¹,

Lei²,

Zhao

et al. 2022

JGR Solid Earth

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The Hainan and surrounding areas in the Eurasian plate are one of the most active and complex regions in the western Pacific subduction system, surrounded by the Indo-Australian plate, the Philippine Sea plate and the Pacific plate (Figure 1). The Pacific and Philippine Sea plates are subducting westward, the Indian plate is subducting eastward, whereas the Indo-Australian plate is subducting northward (Bird, 2003). The interactions between these plates may have significantly influenced mantle convection under this region, which leads to intensive seismicity and intraplate volcanism (Figure 1). The Indo-Eurasian collision resulted in a sinistral strike-slip Red River fault zone (e.g., Bird, 2003;Tapponnier et al., 1982;Xia et al., 2015;Yin, 2010) (Figure 1). Since the Oligocene, the opening of the South China Sea (SCS) has activated the faults in the Leiqiong area, and changed the tectonic stress field from compressive to extensional. As a result, the volcanic activity in this area had continued until the Holocene (e.g., Z.

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“…Along the surface and bottom isothermal boundary condition is applied. The potential temperature of the mantle, plume excess temperature, and plume radius in our model are set as 1,300°C, 150°C and 75 km, respectively (An & Shi, 2006;Le et al, 2015;Lei et al, 2009;Wei & Chen, 2016). The initial thickness of the crust and lithosphere is 35 km and 70 km, respectively (An & Shi, 2006;He et al, 2014;Zhou et al, 2012).…”

Section: Geodynamic Modelingmentioning

confidence: 99%

“…These results together suggest the presence of the Hainan mantle plume. Recent petrological and seismic studies have also estimated the volcanic eruption rate of the plume at 0.1–0.25 km 3 /year (Liu et al, ) and the excess temperature at 140–200 K (Le et al, ; Wei & Chen, ). However, compared with other well‐studied mantle plumes, the hotspot track associated with the Hainan plume has not been investigated in previous studies.…”

Section: Introductionmentioning

confidence: 99%

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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Upper mantle and transition zone structure beneath Leizhou–Hainan region: Seismic evidence for a lower-mantle origin of the Hainan plume

Cited by 11 publications

References 54 publications

Mantle transition zone discontinuities beneath the Indochina Peninsula: Implications for slab subduction and mantle upwelling

Mantle transition zone discontinuities beneath the Indochina Peninsula: Implications for slab subduction and mantle upwelling

Pn Anisotropic Tomography of Hainan Island and Surrounding Areas: New Insights Into the Hainan Mantle Plume

Crustal Footprint of the Hainan Plume Beneath Southeast China

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