南海陆缘伸展破裂过程中的构造迁移和盆地演化
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1.中国石油化工股份有限公司石油物探技术研究院;2.中国地质大学武汉海洋学院海洋地质资源湖北省重点实验室

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国家自然科学基金项目(面上项目,重点项目,重大项目)


TECTONIC PROPOGATION AND BASIN EVOLUTION DURING THE EXTENSION AND BREAKUP OF THE SOUTH CHINA SEA
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1.Sinopec Geophysical Research Institute;2.Hubei Key Laboratory of Marine Geological Resources,China University of Geosciences

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    摘要:

    为了阐明南海由陆向洋的过渡带内构造活动的时间-空间迁移过程,本文以两条跨南海东部共轭被动陆缘和南海西南部共轭陆缘的两条长剖面为基础,进行精细的构造解释和分析,在南海洋陆转换带内确定了出Tb、SD、PD和Bi四个一级层序界面,并以这4个一层序界面为界,将南海陆缘划分为:早期断陷盆地(Tb-SD)、晚期拆离盆地(SD-PD)和断坳转换盆地(PD-Bi)。通过对同一剖面不同构造单元带内同构造地层的分析,发现构造活动时代从陆向洋逐渐变年轻;通过对比不同剖面同一构造单元带内的同构造地层发现,构造活动时代,沿着海底扩张迁移的方向逐渐变年轻。因此在南海扩张期间,岩石圈的伸展变形不仅表现为向洋方向的迁移,同时表现为向海底扩张方向的迁移。

    Abstract:

    In order to clarify the time-space evolution of tectonic activities with the ocean continental transition, we interpret and analysis 2 long seismic lines which are across the conjugate margin of South China Sea. Four first order interfaces have been recognized in the ocean continental transition of SCS: Tb, SD, PD and Bi. These 4 first order horizons separated the basins on continental margin into different proto-basins: the early rifted basin (Tb-SD), the later detachment basin (SD-PD) and the transfer basin (PD-Bi). According to the comparison of syn-tectonic sequences in different domains in one seismic line, the tectonic activities youngling from continent to ocean. According to the comparison the syn-tectonic sequences in same domain between different lines, the tectonic activities youngling along the seafloor spreading direction. Thus, during the seafloor spreading stage, the lithosphere extension deformation propagated not only from continent to ocean, but also along the seafloor spreading direction.

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  • 收稿日期:2023-02-06
  • 最后修改日期:2023-04-23
  • 录用日期:2023-05-24
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