Lithospheric thermal and compositional structure of South China jointly inverted from multiple geophysical observations

Shan, Bin; Zhou, Wei; Xiao, Yang

doi:10.1007/s11430-019-9661-4

Cited by 16 publications

(10 citation statements)

References 37 publications

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“…To the east of the NSGL, the average depth (∼60 km) of the top boundary for the UMLVZs is consistent with the LAB depth revealed by some previous studies (e.g., Deng et al, 2019;Q. Li et al, 2013;, although it is ∼20 km shallower than that reported by other studies (e.g., Shan et al, 2021;Y. Zhang et al, , 2018.…”

Section: Discussionsupporting

confidence: 89%

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Continental Reworking in the Eastern South China Block and Its Adjacent Areas Revealed by F‐J Multimodal Ambient Noise Tomography

Chen

Pan

et al. 2022

JGR Solid Earth

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The South China Block (SCB), which is located in the southeastern part of the Eurasian plate, is generally believed to have developed during the early Neoproterozoic era due to the amalgamation of the Cathaysia Block to the southeast and the Yangtze Craton to the northwest (Figure 1a, Y. Wang et al., 2013). In the Triassic, the SCB collided with the North China Craton (NCC), generating the well-known high and ultrahigh-pressure (HP and UHP) metamorphic belts that constitute the Qinling-Dabie orogen (

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Section: Discussionsupporting

confidence: 89%

“…In contrast, to the west of the NSGL (area A in Figure 19b), the top depth (∼70 km) of the UMLVZs is much shallower than the LAB depth (>150 km) revealed by previous studies (e.g., An & Shi, 2006;T. Li et al, 2022;Shan et al, 2017Shan et al, , 2021. Therefore, defining such a shallow boundary in the upper mantle as the LAB is unreasonable.…”

Section: Discussionmentioning

confidence: 74%

Continental Reworking in the Eastern South China Block and Its Adjacent Areas Revealed by F‐J Multimodal Ambient Noise Tomography

Chen

Pan

et al. 2022

JGR Solid Earth

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“…The distributions of Mg# value in the lithospheric mantle of SCB show that the Cathaysia block and lower Yangtze block are widely underlain by fertile lithospheric mantles (Mg# < 90), which indicate that the old and refractory lithospheric mantle (Mg# > 90) has been replaced by a new fertile lithospheric mantle (Mg# < 90) (Shan et al., 2021). This indicates that chemical/thermal erosion has played an important role in the process of lithosphere thinning in the SCB (Shan et al., 2021). Interestingly, our work suggests that the lithospheric mantle beneath the JYS is undergoing lithospheric modification.…”

Section: Discussionmentioning

confidence: 99%

Lithospheric Structure Near Jiuyishan, South China: Implications for Asthenospheric Upwelling and Lithospheric Modification

Sun

et al. 2021

Geophysical Research Letters

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The South China Block (SCB) is an important part of the Asian continent, and its constituent lithotectonic fragments record a long history of assembly and dispersal within the major supercontinents through the Earth's history (Cawood et al., 2017;Cocks & Torsvik, 2013). The SCB is composed of two major blocks: the Yangtze block in the northwest, and the Cathaysia block in the southeast, which were accreted in the early Neoproterozoic (Li et al., 2009) (Figure 1a). The northeastern segment of the tectonic boundary between the Yangtze and Cathaysia blocks is well exposed and is represented by the Jiangnan-Shaoxing fault (Figure 1a) (Chen et al., 2008;Liu et al., 2012;Wang et al., 2012). However, the location of the boundary in the southwestern segment remains ambiguous because of the widely covered Phanerozoic sediments (Shu, 2012). In the past 30 years, many faults have been proposed as representing the southwestern boundary. Liu et al. (2012) considered the Pingxiang-Yushan fault (PYF) as the boundary based on lithological information. He et al. (2013) proposed that the concealed Jiujiang-Shitai fault represents the southwestern boundary of the Yangtze and Cathaysia blocks. The Chenzhou-Linwu fault (CLF) has been also proposed as the boundary between the two blocks based on various evidences. For example, Deng et al. ( 2014) observed an abrupt variation in gravity and density structure across the CLF from a linear array, suggesting that the CLF may represent the southwestern boundary between the two blocks; Wang et al. (2003) showed Sr-Nd-Pb isotopic differences around the CLF, suggesting that the fault represents the Mesozoic lithospheric boundary between the two blocks; From the South China crustal lithology

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“…In the central-eastern segment of the JOB, F1 is the front edge of the lower basement of the CB and F2 is the upper basement Frontier of the YB. Moreover, the common conversion point (CCP) stacking result of receiver function also clearly shows that Moho is obviously staggered on both sides of the F1, and the inferred LAB seismic phase (Shan et al, 2021;Yang et al, 2021) also shows discontinuous characteristics (Figure 9C; Ye et al, 2019). The velocity imaging results revealed that the YB and CB show different velocity characteristics in the lithospheric mantle (Wang et al, 2018;Chen et al, 2022).…”

Section: Figurementioning

confidence: 97%

Structural boundary and deep contact relationship between the Yangtze and Cathaysia Blocks from crustal thickness gradients

Han

Yang

et al. 2023

Front. Earth Sci.

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The deep boundary and contact relationship between the Yangtze and Cathaysia Blocks (the major tectonic units of the Southern China Block), as well as the tectonic attributes of the Jiangnan Orogenic Belt, have remained unknown or controversial. Using data recorded by 128 portable broadband stations and 96 permanent stations, we obtained high-resolution images of crustal thickness and Poisson’s ratio in the study area. The influences of crustal anisotropy and inclined interface were eliminated by using the newly proposed receiver function H–κ–c stacking method. We then used a gradient analysis method to obtain crustal thickness gradients at the boundary of the Yangtze and Cathaysia Blocks for the first time. Our results reveal that the crustal thickness varies from >38 km in the Qinling–Dabie Orogenic Belt to <30 km east of the Tanlu Fault and Cathaysia Block. Areas with high Poisson’s ratios (>0.27) are concentrated on the flanks of the deep fault zone and the continental margin of the study area; those with low Poisson’s ratios (<0.23) are concentrated in the Jiangnan Orogenic Belt. Large crustal thickness gradients are found beneath the eastern part of the Jiujiang–Shitai buried fault (>5 km/°). Combined with the velocity structure and discontinuity characteristics at different depths, these findings suggest that the Jiujiang–Shitai fault may constitute a deep tectonic boundary dividing the Yangtze and Cathaysia Blocks on the lithospheric scale. Moreover, our results support that the Cathaysia Block subducted northwest-ward toward the southeastern margin of the Yangtze Block in the Neoproterozoic, and that the Jiujiang–Shitai buried fault and Jiangshan–Shaoxing fault are the deep and shallow crustal contact boundaries of the two Blocks, respectively; that is, the Yangtze Block overlaps the Cathaysia Block.

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Lithospheric thermal and compositional structure of South China jointly inverted from multiple geophysical observations

Cited by 16 publications

References 37 publications

Continental Reworking in the Eastern South China Block and Its Adjacent Areas Revealed by F‐J Multimodal Ambient Noise Tomography

Continental Reworking in the Eastern South China Block and Its Adjacent Areas Revealed by F‐J Multimodal Ambient Noise Tomography

Lithospheric Structure Near Jiuyishan, South China: Implications for Asthenospheric Upwelling and Lithospheric Modification

Structural boundary and deep contact relationship between the Yangtze and Cathaysia Blocks from crustal thickness gradients

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