Sharpness of the Midlithospheric Discontinuities and Craton Evolution in North China

Sun, Weijia; Zhao, Liang; Yuan, Huaiyu; Fu, Li

doi:10.1029/2019jb018594

Cited by 10 publications

(5 citation statements)

References 63 publications

(159 reference statements)

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“…The northeastern margin of the Ordos Block is a well-known distribution area for Datong Quaternary volcanoes. Previous studies on the crustal velocity structure and magnetotelluric imaging have suggested that mantle upwelling at the northeastern margin of the Ordos Block is still ongoing [28][29][30][31][32]. Our monitoring results indicate that the ground in the area is experiencing uplift and the strain rate shows tension, which further supports the upwelling of deep material beneath the northeastern margin of the Ordos Block (Figure 6).…”

Section: Ground Deformation Caused By Crustal Movementsupporting

confidence: 78%

Present-Day Three-Dimensional Deformation across the Ordos Block, China, Derived from InSAR, GPS, and Leveling Observations

Liu

Zhu

et al. 2023

Remote Sensing

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The Ordos Block in China experiences tectonic activity and frequent earthquakes due to compression from the Tibetan Plateau and extension from the North China Block. This has prompted the construction of a high-resolution three-dimensional (3D) deformation field to better understand the region’s crustal movement. Considering the limitations of the existing geodetic observations, we used InSAR, GPS, and leveling observations to create a high-precision 3D deformation field for the Ordos Block. Spherical wavelet decomposition was used to separate tectonic and non-tectonic deformation signals. Short-wavelength non-tectonic deformation fields revealed complex surface deformation patterns caused by groundwater, oil, gas extraction, and coal mining. Long-wavelength tectonic deformation fields showed subsidence in the southern margin of the block, while the interior and northeastern margins were uplifted. By combining imaging results from the seismic velocity structure and magnetotellurics, we infer that the upwelling of deep materials beneath the northeastern margin leads to surface uplift with tensile strain rates. The crustal uplift in the area south of 38°N matches the thickening of the lower crust. The weak subsidence and eastward horizontal movement disappearing near 108°E at the southern margin support the existence of asthenosphere flow beneath the Qinling orogenic belt.

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Section: Ground Deformation Caused By Crustal Movementsupporting

confidence: 78%

Present-Day Three-Dimensional Deformation across the Ordos Block, China, Derived from InSAR, GPS, and Leveling Observations

Liu

Zhu

et al. 2023

Remote Sensing

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“…(2013) observed two MLDs within the Kalahari craton, on at ∼85 km depth that is most likely associated with a layer of anisotropy, and a second MLD between 150 and 200 km depth that seems to be linked to magmatic events and the base of the highly depleted cratonic lithosphere. In the stable western portion of the North China Craton, multiple MLDs are observed as well which may be linked to the evolution of the craton and multiple instances of melt infiltration throughout its history (Sun et al., 2020). Other studies have also indicated the presence of multiple phases beneath the Moho, both in cratonic and more active tectonic settings.…”

Section: Discussionmentioning

confidence: 99%

The Lithospheric Architecture of Australia From Seismic Receiver Functions

et al. 2021

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In the past decade, mounting evidence has pointed to complex, layered structure within and at the base of the mantle lithosphere of tectonically quiescent continental interiors. Sometimes referred to as negative velocity gradients or midlithospheric discontinuities (MLDs), the origin of intralithospheric layering has prompted considerable discussion, particularly as to how they may result from continent formation and/or evolution. Previous Sp receiver function analysis in Australia (Ford et al., 2010, https://doi.org/10.1016/j.epsl.2010.10.007) found evidence for complex lithospheric layering beneath permanent stations located within the North, South, and West Australian Cratons and characterized these as MLDs. This study provides an update to the original study by Ford et al. (2010, https://doi.org/10.1016/j.epsl.2010.10.007). Sp receiver function results are presented for 34 permanent, broadband stations. We observe the lithosphere–asthenosphere boundary (LAB) on the eastern margin of the continent, at depths of 75–85 km. The cratonic core of Australia has discontinuities within the lithosphere, with no observable LAB. On the western margin of the continent, we observe several stations with an ambiguous phase that may correspond to an MLD or the LAB. We also observe multiple negative phases at most stations, suggesting a complex and heterogeneous lithosphere. Australian MLDs are likely linked to the presence of hydrous minerals in the midlithosphere and may result from ancient processes such as subduction, plume interaction, or melt infiltration from the paleo‐LAB.

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“…Positive radial anisotropy is interpreted to be the frozen‐in structures in the stable cratonic lithosphere, while the negative one is thought to relate to metasomatism and sublithospheric mantle flow and the vertical infiltration in the lower lithosphere (e.g., Sun et al., 2020). Research on the radial anisotropy of the Sichuan Basin has been limited and controversial.…”

Section: Discussionmentioning

confidence: 99%

Anomalous Radial Anisotropy and Its Implications for Upper Mantle Dynamics Beneath South China From Multimode Surface Wave Tomography

et al. 2022

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The South China Block (SCB), located in the southeastern part of the Eurasian continent, comprises the Yangtze Craton in the northwest and the Cathaysia Block in the southeast, as illustrated in Figure 1a. The two major blocks collided and amalgamated in the Neoproterozoic (1.1-1.0 Ga) along the Jiangnan orogen in the center through long-term plate tectonics and multiphase evolution (Faure et al., 2017;Mao et al., 2014;Zhang et al., 2013). The SCB is in a geologic environment with tectonic compression. In the north, the SCB is bounded by the Qinling-Dabie orogen resulting from collision with the North China Craton (NCC) in the Triassic (Cao et al., 2018;Enkin et al., 1992). In the west, the SCB is bordered by the Tibetan Plateau. The SCB is bounded by the Longmenshan Fault, separating it from the Songpan-Ganzi Block in the northwest.

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Sharpness of the Midlithospheric Discontinuities and Craton Evolution in North China

Cited by 10 publications

References 63 publications

Present-Day Three-Dimensional Deformation across the Ordos Block, China, Derived from InSAR, GPS, and Leveling Observations

Present-Day Three-Dimensional Deformation across the Ordos Block, China, Derived from InSAR, GPS, and Leveling Observations

The Lithospheric Architecture of Australia From Seismic Receiver Functions

Anomalous Radial Anisotropy and Its Implications for Upper Mantle Dynamics Beneath South China From Multimode Surface Wave Tomography

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