Shear wave velocity structure of the crust and upper mantle in Southeastern Tibet and its geodynamic implications

Zhang, Zhiqi; Yao, Huajian; Yang, Yan

doi:10.1007/s11430-020-9625-3

Cited by 99 publications

(86 citation statements)

References 61 publications

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“…According to the along‐profile scope of extremely mafic composition (∼55.7 wt% SiO 2 ) in Stations E23‐E31 of the COMPASS‐ELIP, these regional results with larger station intervals (30–50 km) (W. Wang et al., 2017; Zhang et al., 2020) delineate a mafic area of ∼3 × 10 4 km 2 in the northeastern INZ (Figure 8d), which is largely overlapping with the exposed mafic‐ultramafic intrusions in the Emeishan LIP (Figure 1a). The mafic crust composition of the INZ coincides with a region of high seismic wave velocity (Guo et al., 2017; T. Xu et al., 2015; Zhang et al., 2020), high density (Y. F. Deng et al., 2014), and high resistivity (X. Li et al., 2020). It is also consistent with the previous speculation that the INZ of the Emeishan LIP was significantly modified by the strong vertical deformation accompanied with magmatic emplacement (Chen et al., 2015; W. Li et al., 2021; Y.‐G.…”

Section: Discussionmentioning

confidence: 95%

Crustal SiO₂ Content of the Emeishan Large Igneous Province and its Implications for Magma Volume and Plumbing System

Chen

2021

Geochem Geophys Geosyst

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The Permian Emeishan large igneous province (LIP) in Southwestern China is recognized as a remnant of mantle plume activity. Its crust composition has a significant bearing on understanding the magmatic plumbing system in a LIP and the volume of magmas generated, which is critical to the viability of the mantle plume model and its potential environmental impact but is difficult to constrain. Here, a SiO2‐VP/VS‐VS relationship, compiled from existing laboratory measurements, is used to estimate the crustal SiO2 content of the Emeishan LIP based on the joint constraint of the crustal bulk VP/VS ratio and average VS. The crust underneath the northeastern inner zone of the Emeishan LIP has a SiO2 content of ∼55.7 wt%, in contrast with the bulk continental crust's SiO2 content of 62.1 ± 2.1 wt% but largely overlapping with the exposed mafic‐ultramafic intrusions. Such an unusually “mafic” crust is attributable to the intensive magmatic underplating and intraplating associated with the Emeishan mantle plume. It further allows a minimum estimate of the volume of ∼1.45 × 106 km3 for erupted magmas and ∼2.39 × 106 km3 for total emplaced magmas, which is comparable to the volume of typical plume‐generated LIPs.

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Section: Discussionmentioning

confidence: 95%

Crustal SiO₂ Content of the Emeishan Large Igneous Province and its Implications for Magma Volume and Plumbing System

Chen

2021

Geochem Geophys Geosyst

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“…The high heat flow in this region also agrees with a low S ‐wave velocity feature (H. Zhang, 1996). In explanation of the high‐velocity feature in the northern Leizhou Peninsula, and also located in the inner zone of the Emeishan Large Igneous Province (ELIP), ambient noise tomography shows that the crust has a high S ‐wave velocity feature (Qiao et al., 2018; Z. Zhang et al., 2020; Zhou et al., 2012). Likewise, teleseismic body wave analysis confirms the same high‐velocity structure in the lower crust (J. Liu et al., 2001).…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies based on ambient noise and earthquake surface‐wave tomography have revealed low‐velocity zones in the middle‐lower crust beneath southeastern Tibet, and these weak layers are spatially related to the distribution of important faults in this region, which suggests a complex crustal flow model (e.g., Chen et al., 2014; Qiao et al., 2018; Yao et al., 2008; Z. Zhang et al., 2020). Joint inversion of Rayleigh wave dispersion and receiver functions revealed two low‐velocity channels that are consistent with the clockwise movement of crustal materials (Bao et al., 2015).…”

Section: Introductionmentioning

confidence: 96%

“…Previous studies based on ambient noise and earthquake surface-wave tomography have revealed low-velocity zones in the middle-lower crust beneath southeastern Tibet, and these weak layers are spatially related to the distribution of important faults in this region, which suggests a complex crustal flow model (e.g., Chen et al, 2014;Qiao et al, 2018;Yao et al, 2008;Z. Zhang et al, 2020).…”

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confidence: 96%

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Crustal Footprint of Mantle Upwelling and Plate Amalgamation Revealed by Ambient Noise Tomography in Northern Vietnam and the Northern South China Sea

2021

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The South China Sea (SCS) is one of the largest marginal seas in the western Pacific and is surrounded by several subduction zones. Here, the Indian plate collides with the Eurasian plate and forms the Tibetan Plateau in the northwest, and the Philippine Sea plate subducts beneath the Eurasian plate in the east (Figure 1a). The opening of SCS has been attributed to the tectonic extrusion of the Indochina Peninsula along the Ailao Shan Red River Fault Zone (RRFZ) which resulted from the India-Eurasia collision (Lallemand et al.

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“…They argue that the strong negative velocity anomaly (−6 %) and weak radial anisotropy are consistent with active mantle upwelling and conclude that the asthenospheric flow is strongly perturbed when it encounters the strong Afar plume. The ∼250 Myr old Emeishan large igneous province is also characterized by low velocities and negative radial anisotropy (Huang et al., 2010; Zhang et al., 2020). Analysis of travel time differences between ScS and S phases revealed that V SV is greater than V SH in the lowermost mantle beneath the Siberian LIP (Yang et al., 2008).…”

Section: Introductionmentioning

confidence: 99%

Low‐Velocity Zones and Negative Radial Anisotropy Beneath the Plume Perturbed Northwestern Deccan Volcanic Province

et al. 2021

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The Deccan volcanic province (DVP) witnessed a massive outpouring of flood basalts of ∼2 million km3 volume, at ∼65 Ma, in less than a Myr. The volcanic eruption is concomitant with crustal extension, lithospheric thinning and magma influx beneath the major rift systems namely Cambay, Narmada, and Kutch. In this study, we investigate the anisotropic and isotropic variations within the crust and upper mantle beneath the northwestern DVP by estimating the shear wave velocity (VSV, VSH, and VSoigt) and radial anisotropy (ξoigt) models using the Surface Wave Tomography technique. A joint inversion of the regionalized Rayleigh and Love wave group velocities is performed, using the genetic algorithm approach. Our results reveal different intracrustal layers, lid, and a low‐velocity zone (LVZ). This LVZ comprises of a uniform asthenospheric low‐velocity layer (LVL) of average VSV 4.44 km/s and VSH 4.47 km/s, and another LVL below, of average VSV 4.45 km/s and VSH 4.41 km/s. Furthermore, the LVZ represents a negative anomaly with reference to different global models (AK135, STW105, PREM, and S2.9EA). A negative ξoigt is observed in the LVZ, indicating dominance of vertical flow. This could be related to presence of partials melts, volatile materials and/or a thermal anomaly. We also identified the Moho (∼34–40 km) and lithosphere‐asthenosphere boundary (∼84–123 km). The low VS values, negative ξoigt and a thin lithosphere (∼84 km) in the vicinity of Gulf of Cambay affirm the presence of a plume head beneath it, in concurrence with the hypothesis of Indian Plate‐Reunion plume interaction.

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Shear wave velocity structure of the crust and upper mantle in Southeastern Tibet and its geodynamic implications

Cited by 99 publications

References 61 publications

Crustal SiO₂ Content of the Emeishan Large Igneous Province and its Implications for Magma Volume and Plumbing System

Crustal SiO₂ Content of the Emeishan Large Igneous Province and its Implications for Magma Volume and Plumbing System

Crustal Footprint of Mantle Upwelling and Plate Amalgamation Revealed by Ambient Noise Tomography in Northern Vietnam and the Northern South China Sea

Low‐Velocity Zones and Negative Radial Anisotropy Beneath the Plume Perturbed Northwestern Deccan Volcanic Province

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Shear wave velocity structure of the crust and upper mantle in Southeastern Tibet and its geodynamic implications

Cited by 99 publications

References 61 publications

Crustal SiO2 Content of the Emeishan Large Igneous Province and its Implications for Magma Volume and Plumbing System

Crustal SiO2 Content of the Emeishan Large Igneous Province and its Implications for Magma Volume and Plumbing System

Crustal Footprint of Mantle Upwelling and Plate Amalgamation Revealed by Ambient Noise Tomography in Northern Vietnam and the Northern South China Sea

Low‐Velocity Zones and Negative Radial Anisotropy Beneath the Plume Perturbed Northwestern Deccan Volcanic Province

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Crustal SiO₂ Content of the Emeishan Large Igneous Province and its Implications for Magma Volume and Plumbing System

Crustal SiO₂ Content of the Emeishan Large Igneous Province and its Implications for Magma Volume and Plumbing System