南海岩石圈破裂方式与扩张过程的三维物理模拟

孙珍; 孙龙涛; 周蒂; 蔡东升; 李绪深; 钟志洪; 姜建群; 樊浩

Volume 34 Issue 3

May 2009

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Article Navigation > Earth Science > 2009 > 34(3): 435-447

SUN Zhen, SUN Long-tao, ZHOU Di, CAI Dong-sheng, LI Xu-shen, ZHONG Zhi-hong, JIANG Jian-qun, FAN Hao, 2009. Discussion on the South China Sea Evolution and Lithospheric Breakup through 3D Analogue Modeling. Earth Science, 34(3): 435-447.

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Discussion on the South China Sea Evolution and Lithospheric Breakup through 3D Analogue Modeling

1.
CAS Key Laboratory of Marginal Sea Geology South China Sea Institute of Oceanology Guangzhou 510301 China
2.
Zhanjiang Branch of CNOOC Zhanjiang 524057 China
3.
Dept.of Science and Technology Shenzhen Branch of CNOOC Guangzhou 510240 China
4.
Hainan Oil & Gas Exploration Company Liaohe Oilfield PetroChina Panjin 124010 China

Received Date: 2008-12-21
Publish Date: 2009-05-25

Abstract

Abstract

The evolution of the South China Sea is one of the worldwide hot research spots.In order to investigate its evolution progress of tectonics, we compared three sets of analogue modeling experiments.Modeling experiments suggest that the fault patterns and orientation change of the rift zone were strongly related to the thermal situation and rheological stratification of the lithosphere.Comparing the modeling results with the fault patterns on the conjugate continental margin, we conjectured that the slope area might have born relatively hotter and thinner lithosphere than shelf area from the beginning of rifting.Due to the stretching and mantle upwelling associated with the regional extension, the initial rheological stratification was changed and therefore the rifting pattern from shelf to slope.Affected by the ductile flow of lower crust and asthenosphere, the faults became flattened, especially close to the breakup area.In the experiments, breakup developed first at isolated points, which grew and coalesced to become a single spreading area.The conjugate boundaries were either all concave or all convex.When there was a rigid massif located at the divergent boundary, the northern and southern areas of the massif thinned rapidly and developed into two deep troughs, which may finally evolve into spreading centers.The shape of the massif controls the orientation and boundary shape of the spreading area.It's supposed that the crustal breakup may go in more viscous style, and the NW sub sea basin may develop along the northern trough of the Zhongsha-Xisha massif.
- South China sea,
- breakup pattern,
- tectonic evolution,
- 3D analogue modeling

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Discussion on the South China Sea Evolution and Lithospheric Breakup through 3D Analogue Modeling

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