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Tectonic contrast between the conjugate margins of the South China Sea and the implication for the differential extensional model

  • [设施]:“科学”号海洋科学综合考察船
  • [期刊/会议名称]:SCIENCE CHINA-EARTH SCIENCES
  • [摘要]:The extensional model of the South China Sea (SCS) has been widely studied, but remains under debate. Based on the latest high-quality multi-channel seismic data, bathymetric data, and other obtained seismic profiles, the asymmetric characteristics between the conjugate margins of the SCS are revealed and extensional model of the SCS margin is discussed further. Spatial variation of morphology, basement structure, and marginal faults are discovered amongthe SCS margin profiles. As for the NS-trending variation, the basement of northern margin displays in the shape of step downwards to the sea, while thebasement of southern margin is composed of wide rotated and tilted blocks, without any obvious bathymetric change. The variation also exists in thedevelopment of marginal faults between the conjugate margins, and detachment fault system is identified on the southern margin. Along the southern margin from east to west, the Eastern and Southwestern Basins developed different structural units. Based on the tectonic contrast of the conjugate margins,differential extensional model is proposed to explain the spatial variation of the SCS structure, which introduces detachment faults controlling the evolution ofthe SCS. The upper crust above the detachment fault was deformed by simple shear, while the lower crust and upper mantle below the detachment fault was deformed by pure shear. Because of the different lateral transfer between the upper brittle faulting and the lower ductile extensional regions, there developed marginal plateau (Liyue basin) and outer rise (Zhenghe massif) on the lower plate margin of the Eastern Basin and the Southwestern Basin, respectively. Theevolution of the present SCS may be influenced by the diachronous close of the paleo-SCS.
  • [发表日期]:2014
  • [第一作者]:Dong DongDong
  • [第一作者单位]:中国科学院海洋研究所
  • [通讯作者]:Dong DongDong
  • [通讯作者单位]:中国科学院海洋研究所
  • [论文类型]:期刊
  • [期刊分类]:SCI3区
  • [学科分类]:地球科学
  • [影响因子]:1.491
  • [关键词]:South China Sea; conjugate margin; detachment; differential extension
  • [卷号]:6
  • [期号]:57
  • [起止页码]:1415-1426
  • [简介]: