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    中沙海槽盆地构造与沉积作用及其对远端裂陷盆地演化的启示

    汪斯毓 王仕胜 刘艳锐 吴时国

    汪斯毓, 王仕胜, 刘艳锐, 吴时国, 2022. 中沙海槽盆地构造与沉积作用及其对远端裂陷盆地演化的启示. 地球科学, 47(3): 1094-1106. doi: 10.3799/dqkx.2021.067
    引用本文: 汪斯毓, 王仕胜, 刘艳锐, 吴时国, 2022. 中沙海槽盆地构造与沉积作用及其对远端裂陷盆地演化的启示. 地球科学, 47(3): 1094-1106. doi: 10.3799/dqkx.2021.067
    Wang Siyu, Wang Shisheng, Liu Yanrui, Wu Shiguo, 2022. Tectonics and Sedimentation of the Zhongsha Trough Basin: Implications to the Basin Evolution in Distal Rifting Margin. Earth Science, 47(3): 1094-1106. doi: 10.3799/dqkx.2021.067
    Citation: Wang Siyu, Wang Shisheng, Liu Yanrui, Wu Shiguo, 2022. Tectonics and Sedimentation of the Zhongsha Trough Basin: Implications to the Basin Evolution in Distal Rifting Margin. Earth Science, 47(3): 1094-1106. doi: 10.3799/dqkx.2021.067

    中沙海槽盆地构造与沉积作用及其对远端裂陷盆地演化的启示

    doi: 10.3799/dqkx.2021.067
    基金项目: 

    中国地质调查局项目 DD20191027

    国家自然科学委‒广东省联合基金重点基金项目 U1701245

    详细信息
      作者简介:

      汪斯毓(1988-),男,工程师,主要从事海洋科学研究.ORCID:0000-0002-7907-1981. E-mail:wangsiyuz1@163.com

      通讯作者:

      吴时国,E-mail: swu@idsse.ac.cn

    • 中图分类号: P736

    Tectonics and Sedimentation of the Zhongsha Trough Basin: Implications to the Basin Evolution in Distal Rifting Margin

    • 摘要:

      深水远端裂陷盆地演化是大陆边缘构造研究的热点.中沙海槽盆地位于西北次海盆和西南次海盆之间,是一个临近洋盆的裂陷盆地.根据最新的地球物理资料,揭示了该盆地的沉积层序和构造演化.中沙海槽盆地裂开后期地层厚度约为200~1 500 m,可划分为6个地震层序.古近系分布局限,仅限于中沙海槽盆地和中沙南盆地的深凹部位;新近系一般厚为200~1 100 m;第四系厚度薄且变化小.中沙海槽盆地主要特征如下:(1)岩浆活动强烈,岩体数量较多,遍布整个盆地,地震剖面上的反射特征表明有侵入型和喷出型两类岩石.重磁异常综合解释表明火成岩成分为中‒酸性和中‒基性两类;(2)裂陷盆地位于拆离的磁性基底隆起之上,磁性基底北深南浅,埋深在6.0~10.4 km之间;(3)莫霍面埋深在15~24 km之间,地壳由陆向海逐渐减薄、由盆地到岛礁逐渐变厚.中沙海槽盆地通常以犁式正断层为边界断层,其构造变形以伸展构造为主,断层走向主要有NE-SW向和NW-SE向,其中NE-SW向控制了新生代沉积坳陷的发育.

       

    • 图  1  中沙海槽盆地构造位置、水深与测线分布

      黑线指示测线位置,虚线是中沙盆地的边界.左上图表示盆地的构造位置

      Fig.  1.  Tectonic location, bathymetry and seismic trackline of the Zhongsha trough basin

      图  2  地震层序与海平面变化特征

      全球海平面变化参考Haq et al.1987)和Miller et al.2011);地区海平面变化曲线参考西沙海区发表的文献,主要为王振峰等(2015

      Fig.  2.  Seismic sequence and sea level curve

      图  3  中沙海槽盆地地震层序

      a. shd-2测线;b. dbphz165m-1b测线

      Fig.  3.  Seismic sequences across the Zhongsha trough basin

      图  4  地震侧线nh2d-inl500解释剖面

      Fig.  4.  Interpretation section of seismic Line nh2d-inl500

      图  5  穿过中沙海槽盆地的地震剖面

      该剖面揭示了主要构造单元和地震层序;地震剖面位置见图 1

      Fig.  5.  Seismic section across the Zhongsha trough basin

      图  6  研究区上延25 km磁异常

      Fig.  6.  Magnetic anomaly map in the study area

      图  7  研究区磁性基底埋深分布

      Fig.  7.  Magnetic basement buried depth in the study area

      图  8  中沙海槽盆地及其邻近海区域重磁推测的火成岩平面分布

      Fig.  8.  The igneous map in the Zhongsha trough basin inferred from gravity and magnetic anomaly

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