Rayleigh wave phase velocities of South China block and its adjacent areas

Lü, Jian; Xie, Zhicai; Zheng, Yong; Zha, Xiaohui; Rui, Hu; Xinfu, Zeng

doi:10.1007/s11430-015-5372-5

Cited by 8 publications

(4 citation statements)

References 30 publications

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“…Our ambient noise tomographic model exhibits large-scale features consistent with findings from previous regional studies [38,[62][63][64]. These studies identified low-velocity anomalies in a broad area encompassing the Leizhou Peninsula, the eastern Beibu Gulf, and the northernmost part of Hainan Island.…”

Section: Comparison With Previous Modelssupporting

confidence: 87%

The Magmatic Patterns Formed by the Interaction of the Hainan Mantle Plume and Lei–Qiong Crust Revealed through Seismic Ambient Noise Imaging

Pan,

Yang,

et al. 2024

Geosciences

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Magmatism on continental lithospheres induced by mantle plumes is more complex compared to oceanic intraplate volcanism owing to the heterogeneous nature of continental crustal and lithospheric structures. Substantial evidence points to the deep-oriented Hainan mantle plume beneath the Lei–Qiong region, the southernmost of the South China block. In this study, we present a detailed shear wave velocity model of the crust and uppermost mantle in the Lei–Qiong volcanic region, derived from 3-year seismic data (2016–2018) from 34 stations and the use of the ambient noise tomography method. An evident columnar low-velocity anomaly was imaged in the crust and uppermost mantle beneath the Wushi Sag (WSS), Beibu Gulf, potentially suggesting that the center of either one branch or the entirety of the Hainan mantle plume impacts the crust here. This low-velocity anomaly is overlaid by a local Moho deepening, indicative of underplating beneath the existing crust. The Maanling–Leihuling Volcanic Field (MLVF) in northern Hainan Island, previously considered the center of the hotspot, does not exhibit such distinct velocity anomalies. Instead, subtle lower crustal anomalies beneath the MLVF are linked with the upper mantle low-velocity zone beneath the WSS. Additionally, the high-conductivity bodies beneath the MLVF indicate lateral magma transport. Earthquake swarms and deep-seated seismic events beneath the WSS further support the presence of magmatic processes. This study indicates that in the Lei–Qiong region, the interaction of the continental crust with the mantle plume centered in the WSS results in magma exhibiting both vertical ascent and lateral migration, leading to a dual low-velocity shear wave pattern in the upper crust, which significantly influences the surface volcanic activity.

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Section: Comparison With Previous Modelssupporting

confidence: 87%

The Magmatic Patterns Formed by the Interaction of the Hainan Mantle Plume and Lei–Qiong Crust Revealed through Seismic Ambient Noise Imaging

Pan,

Yang,

et al. 2024

Geosciences

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“…The southeastern part of the South China block is affected by the subduction of the Pacific and Philippine Sea plates under the Eurasian plate, resulting in geodynamic characteristics of island arcs and continental amalgamation. However, in the west, the eastward subduction of the Indian plate beneath the Eurasian plate has resulted in a series of orogenic belts and deformation of the lithosphere (e.g., J. Lü et al., 2016; J. Zhu et al., 2005) (Figure 1). The northward subduction of the Indo‐Australian plate led to a series of nearly E‐W trending compressive faults around the South China continental margins.…”

Section: Introductionmentioning

confidence: 99%

“…However, in the west, the eastward subduction of the Indian plate beneath the Eurasian plate has resulted in a series of orogenic belts and deformation of the lithosphere (e.g., J. Lü et al, 2016;J. Zhu et al, 2005) (Figure 1).…”

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confidence: 99%

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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“…Specifically, the Cathaysia block has experienced lithospheric thinning and delamination, whereas the Yangtze Craton has evolved into a relatively stable quasicraton [Shu, 2012]. Many studies have shown that the tectonic mechanism of the Yangtze Craton and the Cathaysia block have been affected by the compositions and multiscale inhomogeneity of lithospheric structures [Ai et al, 2007;Zheng et al, 2008;Luo et al, 2012;Lv et al, 2016;Ding et al, 2017;Shahzad et al, 2021]. The North hidden fault zone and the Jiangshan-Shaoxing-Pingxiang fault are the boundaries of the Jiangnan orogen, which divided the South China block into the Yangtze Craton and the Cathaysia block [Shu et al, 2009;Zhang et al, 2013].…”

Section: Introductionmentioning

confidence: 99%

Azimuthal Anisotropy of Receiver Functions in the Central South China Block and its Tectonic Implications

Gao

Zhang

et al. 2023

Annals of Geophysics

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By the H-к stacking of the receiver functions and the splitting of the Pms phases, using seismic data from the Regional Seismic Network and the Huanan Seismic Array, a high-resolution temporary seismic array deployed for 2 years in the study area. This study revealed the strong lateral heterogeneity in crustal structures in the central South China block. Crustal thickness reduces from northwest to southeast, with significant differences across the boundary of sub-blocks. The average crustal Vp/Vs ratio gradually increases from west to east, leading to high values in the coastal region, which suggests that the subduction of the Pacific plate has possibly caused the underplating of magma or the upwelling of upper mantle material. The crustal azimuthal anisotropy of the Dabie orogen and the Jiangnan orogen is generally consistent with the strike of the tectonic belt as well as with the orientation of the absolute plate movement. We suggest that the crustal azimuthal anisotropy of the orogen is related to the extension and deformation of the lithosphere. The anisotropy in the crust is close related to crustal deformation. The orientation in the crust and the upper mantle in the Cathaysia block are generally consistent with the orientation of the absolute plate motion, indicating that the azimuthal anisotropy of the Cathaysia block is related to lithospheric deformation and the under-invasion of upper mantle material.

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Rayleigh wave phase velocities of South China block and its adjacent areas

Cited by 8 publications

References 30 publications

The Magmatic Patterns Formed by the Interaction of the Hainan Mantle Plume and Lei–Qiong Crust Revealed through Seismic Ambient Noise Imaging

The Magmatic Patterns Formed by the Interaction of the Hainan Mantle Plume and Lei–Qiong Crust Revealed through Seismic Ambient Noise Imaging

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

Azimuthal Anisotropy of Receiver Functions in the Central South China Block and its Tectonic Implications

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