Crust and upper mantle structure and its tectonic implications in the South China Sea and adjacent regions

Tang, Qunshu; Zheng, Changqing

doi:10.1016/j.jseaes.2012.10.037

Cited by 66 publications

(47 citation statements)

References 78 publications

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“…Moreover, a body-wave tomography model beneath eastern China shows that seismic velocity is lower in the southwestern part of the Cathaysia Fold Belt than that in the northeastern part . The ESE-WNW trending boundary also exhibits a significant change in the lithospheric thickness (Tang and Zheng, 2013) and surface topography (Fig. 7a), being well consistent with the geochemical results (e.g., Yu et al, 2010).…”

Section: Discussionsupporting

confidence: 87%

Lateral variation of crustal structure and composition in the Cathaysia block of South China and its geodynamic implications

Xia,

Shen,

Zhao

et al. 2015

Journal of Asian Earth Sciences

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Section: Discussionsupporting

confidence: 87%

Lateral variation of crustal structure and composition in the Cathaysia block of South China and its geodynamic implications

Xia,

Shen,

Zhao

et al. 2015

Journal of Asian Earth Sciences

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“…2) but this is on the edge of the area with limited or inadequate resolution so this feature could be an artefact. Regional surface wave tomography (Tang and Zheng, 2013) shows high velocities in the lithosphere suggesting the anomaly is real. Assuming it is not an artefact, a possible explanation for this feature is a slab subducted northwards from the Celebes Sea in the Middle and Late Miocene (c. 15 to 5 Ma), now broken off, which created the Sulu arc (Cottam et al, 2013;Hall, 2013).…”

Section: North Borneo To Sulu Seamentioning

confidence: 99%

Mantle structure and tectonic history of SE Asia

2015

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“…z 0 ( x , t ) represents the upper surface of the model. The lower boundary temperature T ( x ,0) can vary with time, and here, it is set to be T 1 = 1390°C according to the 3D S‐velocity model of the South China Sea (Tang & Zheng, ) and the method of Priestley & McKenzie (). The initial thermal field is assumed to be steady with T ( x , a ) = 22°C.…”

Section: Numerical Experimentsmentioning

confidence: 99%

Models of the rapid post‐rift subsidence in the eastern Qiongdongnan Basin, South China Sea: implications for the development of the deep thermal anomaly

et al. 2016

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The Qiongdongnan Basin is one of the largest Cenozoic rifted basins on the northern passive margin of the South China Sea. It is well known that since the Late Miocene, approximately 10 Ma after the end of the syn-rift phase, this basin has exhibited rapid thermal subsidence. However, detailed analysis reveals a two-stage anomalous subsidence feature of the syn-rift subsidence deficit and the wellknown rapid post-rift subsidence after 10.5 Ma. Heat-flow data show that heat flow in the central depression zone is 70-105 mW m À2, considerably higher than the heat flow (<70 mW m À2 ) on the northern shelf. In particular, there is a NE-trending high heat-flow zone of >85 mW m À2 in the eastern basin. We used a numerical model of coupled geothermal processes, lithosphere thinning and depositional processes to analyse the origin of the anomalous subsidence pattern. Numerical analysis of different cases shows that the stretching factor b s based on syn-rift sequences is less than the observed crustal stretching factor b c , and if the lithosphere is thinned with b c during the syn-rift phase (before 21 Ma), the present basement depth can be predicted fairly accurately. Further analysis does not support crustal thinning after 21 Ma, which indicates that the syn-rift subsidence is in deficit compared with the predicted subsidence with the crustal stretching factor b c . The observed high heat flow in the central depression zone is caused by the heating of magmatic injection equivalently at approximately 3-5 Ma, which affected the eastern basin more than the western basin, and the Neogene magmatism might be fed by the deep thermal anomaly. Our results suggest that the causes of the syn-rift subsidence deficit and rapid post-rift subsidence might be related. The syn-rift subsidence deficit might be caused by the dynamic support of the influx of warmer asthenosphere material and a small-scale thermal upwelling beneath the study area, which might have been persisting for about 10 Ma during the early post-rift phase, and the post-rift rapid subsidence might be the result of losing the dynamic support with the decaying or moving away of the deep thermal source, and the rapid cooling of the asthenosphere. We concluded that the excess post-rift subsidence occurs to compensate for the syn-rift subsidence deficit, and the deep thermal anomaly might have affected the eastern Qiongdongnan Basin since the Late Oligocene.

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Crust and upper mantle structure and its tectonic implications in the South China Sea and adjacent regions

Cited by 66 publications

References 78 publications

Lateral variation of crustal structure and composition in the Cathaysia block of South China and its geodynamic implications

Lateral variation of crustal structure and composition in the Cathaysia block of South China and its geodynamic implications

Mantle structure and tectonic history of SE Asia

Models of the rapid post‐rift subsidence in the eastern Qiongdongnan Basin, South China Sea: implications for the development of the deep thermal anomaly

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