MA Hui, XU Hehua, WU Shimin, LIU Hailin. NUMERICAL SIMULATION OF FORELAND BASIN EVOLUTION IN NANSHA TROUGH SINCE MIDDLE MIOCENE[J]. Marine Geology & Quaternary Geology, 2011, 31(6): 157-166. DOI: 10.3724/SP.J.1140.2011.06157
Citation: MA Hui, XU Hehua, WU Shimin, LIU Hailin. NUMERICAL SIMULATION OF FORELAND BASIN EVOLUTION IN NANSHA TROUGH SINCE MIDDLE MIOCENE[J]. Marine Geology & Quaternary Geology, 2011, 31(6): 157-166. DOI: 10.3724/SP.J.1140.2011.06157
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NUMERICAL SIMULATION OF FORELAND BASIN EVOLUTION IN NANSHA TROUGH SINCE MIDDLE MIOCENE

  • 1 Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;

  • 2 Graduate University of Academy of Sciences, Beijing 100049, China;

  • 3 Department of Earth Sicences, Sun Yat-Sen University, Guangzhou 510275, China

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  • Received Date: January 04, 2011
  • Revised Date: August 19, 2011
    Graphical Abstract
    • Abstract
  • In order to better understand the mechanism and characteristic of foreland basin evolution in the NanSha trough, we studied the structure, sedimentology and other characteristics of the basin based on the geophysical data of the past decades collected from South China Sea Institute and recent research progress both at home and abroad. An elastic lithospheric plate flexure model for Nansha Trough foreland basin is established. The finite difference method was used to simulate the basin evolution since Middle Miocene. With the model, we reconstructed the history of deposition, subsidence, tectonic movement and deflection and deformation process in the basin, and predicted the geometry, gravity anomaly, sediment thickness of the basin in different stages. The predicted gravity anomaly and basin topography fit well with the measured data at 0 Ma stage. And the basin simulation shows that basin deflection caused by the sediment load is only about 2 300 m, indicating that the basin crust had been flexible before the formation of foreland basin, and the flexural deformation of the foreland basin is not only related to basin structure, topography and depositional load, but also possibly affected by lithospheric load in the deeper part.
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