Tectono-thermal modeling of the Yinggehai Basin, South China Sea

He, Lijuan; Xiong, Lihua; Wang, Jing; Yang, Jin; Dong, Weiliang

doi:10.1007/bf02906880

Cited by 14 publications

(5 citation statements)

References 2 publications

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“…Shi et al (2003) suggested that the proportion of mantle heat flow becomes more important with respect to surface heat flow from the shelf to slope. He et al (2001) suggested that three phases of extension made the Yinggehai basin hotter and hotter, and more than 80% of the surface heat flow was controlled by the basement heat flow. The northern continental margin experienced three main phases of extension during the rifting stage, which might make the basin hotter and hotter.…”

Section: Dynamic Analysismentioning

confidence: 99%

Patterns and dynamics of rifting on passive continental margin from shelf to slope of the northern South China Sea: Evidence from 3D analogue modeling

Sun

Zhou

et al. 2009

J. Earth Sci.

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Affected by thermal perturbation due to mantle uprising, the rheological structure of the lithosphere could be modified, which could lead to different rifting patterns from shelf to slope in a passive continental margin. From the observed deformation style on the northern South China Sea and analogue modeling experiments, we find that the rift zone located on the shelf is characterized by half grabens or simple grabens controlled mainly by long faults with large vertical offset, supposed to be formed with normal lithosphere extension. On the slope, where the lithosphere is very hot due to mantle upwelling and heating, composite grabens composed of symmetric grabens developed. The boundary and inner faults are all short with small vertical offset. Between the zones with very hot and normal lithosphere, composite half grabens composed of half grabens or asymmetric grabens formed, whose boundary faults are long with large vertical offset, while the inner faults are relatively short. Along with the thickness decrease of the brittle upper crust due to high temperature, the deformation becomes more sensitive to the shape of a pre-existing weakness zone and shows orientation variation along strike. When there was a bend in the pre-existing weakness zone, and the basal plate was pulled by a clockwise rotating stress, the strongest deformation always occurs along the middle segment and at the transition area from the middle to the eastern segments, which contributes to a hotter lithosphere in the middle segment, where the Baiyun (白云) sag formed.

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Section: Dynamic Analysismentioning

confidence: 99%

Patterns and dynamics of rifting on passive continental margin from shelf to slope of the northern South China Sea: Evidence from 3D analogue modeling

Sun

Zhou

et al. 2009

J. Earth Sci.

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“…Under the influence of the multi-episodes tectonic movement, the stretching process of the northern continental margin of the SCS was episodic [16,7]. This feature was taken into account in the following 2D forward modeling for the BYS.…”

Section: Cenozoic Tectonic Movements In the Prmbmentioning

confidence: 99%

Numerical modeling of the anomalous post-rift subsidence in the Baiyun Sag, Pearl River Mouth Basin

Liao

Zhou

Zhao

et al. 2011

Sci. China Earth Sci.

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The Baiyun Sag is the deepest sag in the Pearl River Mouth Basin in northern continental margin of South China Sea, with the maximum sediment thickness over 12.5 km above the basement including >6.5 km sediments above the 30 Ma breakup unconformity. According to the theoretical models for the rifted basins, the post-rift subsidence is driven solely by the thermal contraction and can be calculated as the function of the lithospheric stretching factor. A method combining the forward modeling and reverse backstripping was designed to estimate lithospheric stretching factor. Using the 2D forward modeling based on the flexural cantilever model, we simulated the multi-rifting process of the Baiyun Sag with constrain of the backstripped profiles. By doing this the lithospheric stretching factor was obtained, and then the theoretical post-rift subsidence was calculated. The calculated theoretical subsidence was much smaller than the observed subsidence given by backstripping. Along the 1530 line in the Baiyun Sag, the anomalous post-rift subsidence is over 2 km in the sag center, and varies slightly to the north and south edges of the sag. This suggests that the anomalous post-rift subsidence continues beyond the sag both in the continental shelf to the north and in the continental slope to the south. The sensitivity tests in the forward modeling process indicate that only the use of low-angle faults (≤13°) can we simulate the shape of the backstripped profile. anomalous post-rift subsidence, 2D backstripping, 2D forward modeling, Baiyun Sag, Pearl River Mouth Basin Citation: Liao J, Zhou D, Zhao Z X, et al. Numerical modeling of the anomalous post-rift subsidence in the

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“…Finally, the heat flow history is determined by forward modelling combined with burial history. On the basin scale, which is called "thermal indicator inversion", the thermal history is derived from direct or indirect inversion of multiple thermal indicators (He et al, 2000;Hu et al, 1995). So far there are no thermal indicators found in the study area and the tectonothermal evolution modelling can only provide the background heat flow history, which can not reflect the influence of intrusions on the heat flow.…”

Section: Influence On Heat Flowmentioning

confidence: 99%

Modelling of Thermal Effects of Igneous Intrusions on the Temperature Field and Organic Maturity in the Changchang Sag, Qiongdongnan Basin, South China Sea

Tang

Zhang²,

Jian-she³

et al. 2014

Chinese J of Geophysics

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The latest seismic interpretation suggests the presence of several igneous intrusions in the Changchang sag, Qiongdongnan basin, South China Sea. A 2D geothermal modeling based on the finite element method (FEM) is performed to analyze the thermal effects of three intrusions of different scales distributed in the same seismic line. A quantitative evaluation is made on the organic maturity change for the Yacheng Formation caused by intrusions in artificial wells 2 km and 5 km away from each igneous body in combination with the acquired paleo‐geothermal field and the Easy%Ro model. The results indicate that the temperatures of igneous bodies dropped down rapidly during the first 1 Ma after the intrusion and lowered to the nearly same values as that of the wall rock after 10 Ma. The biggest intrusion caused a theoretical vitrinite reflectance (Ro) 1.6% higher than normal for the Yacheng Formation at the place 2 km away and only 0.4% higher for that 5 km distant.

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Tectono-thermal modeling of the Yinggehai Basin, South China Sea

Cited by 14 publications

References 2 publications

Patterns and dynamics of rifting on passive continental margin from shelf to slope of the northern South China Sea: Evidence from 3D analogue modeling

Patterns and dynamics of rifting on passive continental margin from shelf to slope of the northern South China Sea: Evidence from 3D analogue modeling

Numerical modeling of the anomalous post-rift subsidence in the Baiyun Sag, Pearl River Mouth Basin

Modelling of Thermal Effects of Igneous Intrusions on the Temperature Field and Organic Maturity in the Changchang Sag, Qiongdongnan Basin, South China Sea

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