The shear-wave splitting in the crust and the upper mantle around the Bohai Sea, North China

Shi, Yaolin; Gao, Yuan; Ling-xue, Tai; Fu, Yuanyuan

doi:10.1016/j.jseaes.2015.06.015

Cited by 15 publications

(3 citation statements)

References 60 publications

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“…Additionally, the boundary between the Taihang Mountains and the BBB features low S‐wave velocities in the uppermost mantle (Feng et al., 2022), corresponding to significant gradients of lithosphere and crustal thickness (L. Chen et al., 2006; Duan et al., 2016; T. Y. Zheng et al., 2005). This is in line with the concept of edge‐driven mantle convection beneath eastern NCB, triggered by the subduction of the Pacific plate (Z. Guo et al., 2016a; Shi et al., 2015). The lateral mantle convection may promote ductile extension of the lithospheric mantle and the lower crust of the BBB (Ai et al., 2020).…”

Section: Discussionsupporting

confidence: 87%

Cenozoic Evolution of the Bohai Bay Basin: Constraints From Seismic Radial Anisotropy

Wu,

Li,

Fan

et al. 2024

Geophysical Research Letters

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We obtain three‐dimensional models of crustal shear‐wave velocity and radial anisotropy in the Bohai Bay basin (BBB), revealing distinct radial anisotropy patterns. The western region of the basin exhibits pronounced positive crustal radial anisotropies, attributed to upper mantle convection driven by the subduction of the Pacific plate during the early Tertiary. Conversely, the eastern region of the basin demonstrates weak to negative radial anisotropies, indicating a compression shear rupture system influenced by the far‐field India‐Eurasian collision during the Neogene‐Quaternary. These differences suggest that the formation of the BBB is associated with the dynamic transition from Pacific subduction to India‐Eurasian collision during the Cenozoic. Moreover, the Luxi uplift, with its stable upper‐middle crustal structures, acts as a barrier hindering the eastward extension of the BBB.

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Section: Discussionsupporting

confidence: 87%

Cenozoic Evolution of the Bohai Bay Basin: Constraints From Seismic Radial Anisotropy

Wu,

Li,

Fan

et al. 2024

Geophysical Research Letters

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“…They attributed this observation to “fossil” anisotropy frozen in the lithospheric mantle in response to the Late Archean to Paleoproterozoic collision (and deformation) between the Eastern and the Western Blocks. This NE‐to NNE‐trending fast polarization direction was also confirmed by some other shear wave measurements (e.g., Z. Huang et al., 2011; Shi et al., 2015; L. Zhao & Xue, 2010) and consistent with the fast velocity directions of P wave anisotropy tomography (e.g., Z. Huang et al., 2014; Tian & Zhao, 2013) in this region. Different from L. Zhao and Zheng (2005), other studies attributed such a seismic anisotropy to an NE‐SW trending asthenospheric mantle flow (Tian & Zhao, 2013; L. Zhao & Xue, 2010; L. Zhao et al., 2011).…”

Section: Discussionsupporting

confidence: 86%

Influence of Melt‐Peridotite Interactions on Deformation and Seismic Properties of the Upper Mantle Beneath a Destroyed Craton: A Case Study of the Damaping Peridotites From the North China Craton

2023

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Extensive melt‐peridotite interactions had been documented in the lithospheric mantle beneath the North China Craton (NCC), a prime example of destroyed cratons in the world. Yet the impacts of melt‐peridotite interactions on the deformation and seismic anisotropy of the NCC upper mantle remain unclear. Here we studied in detail the microstructure, crystallographic preferred orientation (CPO) of minerals, and seismic properties of 26 peridotite xenoliths from the Damaping area of the NCC. The studied samples can be classified into two groups: weakly to nonfoliated and strongly foliated. Petrographic and microstructural observations suggest that multiple melt‐peridotite interactions and at least two stages of deformation had influenced samples from both microstructural groups. Dislocation creep in response to a transpression deformation led to the [010]‐fiber type olivine CPOs in most samples. Variable degrees of annealing followed the last stage of deformation. Due to a higher degree of melt‐peridotite interactions, which had promoted nondislocation creep, and more extensive annealing, olivine and pyroxene in the strongly foliated samples developed weaker CPOs. This in turn leads to weaker maximum P wave propagation anisotropy and S wave polarization anisotropy for this microstructural group. Our data, therefore, cast light on a strong control of intensity of melt‐peridotite interactions on deformation and seismic properties of the upper mantle beneath the NCC. If foliation and lineation are vertical and horizontal, respectively, the measured SKS splitting parameters can be well explained by the “fossil” anisotropy frozen in the lithospheric mantle, with no need to invoke asthenospheric flow as a source of the anisotropy.

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“…The surface wave anisotropy models YB13SVani (Yuan & Beghein, 2013) are available at https://faculty.epss.ucla.edu/∼cbeghein/ research/global-tomography/sv-anisotropy-mantle-transition-zone. SWS splitting data (Chang et al, 2017;Chen et al, 2017;Li et al, 2018;Qiang et al, 2017;Shi et al, 2015;Yang et al, 2019;Yu & Chen, 2016) can be accessed at https://ds.iris.edu/spud/swsmeasurement/. The data for numerical results of Model 1 and related plotting scripts are available at Zenodo (https://doi.org/10.5281/zenodo.3884294).…”

Section: Discussionmentioning

confidence: 99%

Formation of East Asian Stagnant Slabs Due To a Pressure‐Driven Cenozoic Mantle Wind Following Mesozoic Subduction

Peng

Liu

et al. 2021

Geophysical Research Letters

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The term "stagnant slab" usually refers to the widely distributed fast seismic anomalies within the circum-Pacific mantle transition zones (MTZ) (Fukao et al., 2009;Huang & Zhao, 2006). There are several proposed mechanisms for why slabs can stagnate in the MTZ. The first one is related to the buoyancy associated with phase transformations of major mantle minerals, where both the negative Clapeyron slope of the ringwoodite-bridgmanite transformation (Christensen & Yuen, 1985;Tackley et al., 1993) and the delayed pyroxene-garnet transformation (King et al., 2015) tend to trap the slab within the MTZ. The second one is about the viscosity structure (Gurnis & Hager, 1988), where either a large viscosity increase into the lower mantle or a thin low-viscosity-layer right below the 660 km is invoked (Mao & Zhong, 2018). The third one concerns the age of the subducting plates, where a progressively older subducting slab tends to result in obvious trench retreat and stagnant slabs in the MTZ (Yang et al., 2018). The fourth one is the trench retreat, commonly attributed as an important reason for slab stagnation (Christensen, 1996; van der Hilst & Seno, 1993;Zhong & Gurnis, 1995). Some recent studies suggest the potential role of former subduction (Hu & Gurnis, 2020;Liu et al., 2021), but the dynamic nature remains elusive. There is still no systematic evaluation of these effects using a data-driven thermal-chemical modeling framework.East Asia is an ideal location for studying subduction dynamics and slab stagnation. Numerous tomography models reveal high-velocity seismic anomalies in the MTZ beneath East Asia that are commonly interpreted as stagnant slabs (

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The shear-wave splitting in the crust and the upper mantle around the Bohai Sea, North China

Cited by 15 publications

References 60 publications

Cenozoic Evolution of the Bohai Bay Basin: Constraints From Seismic Radial Anisotropy

Cenozoic Evolution of the Bohai Bay Basin: Constraints From Seismic Radial Anisotropy

Influence of Melt‐Peridotite Interactions on Deformation and Seismic Properties of the Upper Mantle Beneath a Destroyed Craton: A Case Study of the Damaping Peridotites From the North China Craton

Formation of East Asian Stagnant Slabs Due To a Pressure‐Driven Cenozoic Mantle Wind Following Mesozoic Subduction

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