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    南海北部东沙海底峡谷沉积演化过程及其地质意义

    王星星 蔡峰 孙治雷 李清 李昂 闫桂京 孙运宝 骆迪 董刚

    王星星, 蔡峰, 孙治雷, 李清, 李昂, 闫桂京, 孙运宝, 骆迪, 董刚, 2021. 南海北部东沙海底峡谷沉积演化过程及其地质意义. 地球科学, 46(3): 1023-1037. doi: 10.3799/dqkx.2020.277
    引用本文: 王星星, 蔡峰, 孙治雷, 李清, 李昂, 闫桂京, 孙运宝, 骆迪, 董刚, 2021. 南海北部东沙海底峡谷沉积演化过程及其地质意义. 地球科学, 46(3): 1023-1037. doi: 10.3799/dqkx.2020.277
    Wang Xingxing, Cai Feng, Sun Zhilei, Li Qing, Li Ang, Yan Guijing, Sun Yunbao, Luo Di, Dong Gang, 2021. Sedimentary Evolution and Geological Significance of the Dongsha Submarine Canyon in the Northern South China Sea. Earth Science, 46(3): 1023-1037. doi: 10.3799/dqkx.2020.277
    Citation: Wang Xingxing, Cai Feng, Sun Zhilei, Li Qing, Li Ang, Yan Guijing, Sun Yunbao, Luo Di, Dong Gang, 2021. Sedimentary Evolution and Geological Significance of the Dongsha Submarine Canyon in the Northern South China Sea. Earth Science, 46(3): 1023-1037. doi: 10.3799/dqkx.2020.277

    南海北部东沙海底峡谷沉积演化过程及其地质意义

    doi: 10.3799/dqkx.2020.277
    基金项目: 

    国家重点研发计划项目 2018YFC0310001

    中国地质调查局海洋地质调查专项项目 DD20190819

    详细信息
      作者简介:

      王星星(1991-), 男, 博士, 主要从事深水沉积学研究.ORCID: 0000-0002-6083-001X.E-mail: Xingx_Wang@hotmail.com

      通讯作者:

      蔡峰, E-mail: caifeng0532@163.com

    • 中图分类号: P736

    Sedimentary Evolution and Geological Significance of the Dongsha Submarine Canyon in the Northern South China Sea

    • 摘要: 为揭示南海北部东沙海底峡谷沉积演化及其资源效应,利用高分辨率二维多道地震与多波束测深数据,对该峡谷中-上游段的沉积层序、地貌特征及沉积构型展开剖析.东沙海底峡谷上游段表现为6个分支峡谷,中游段则汇聚为2条主峡谷,峡谷头部广泛发育分支水道.峡谷中游段于早中新世晚期开始发育,处于岩浆岩体和构造凸起之间;上游段分支峡谷形成于晚中新世以来,其与峡谷头部分支水道的形成分别受断裂体系和底流作用影响较大.东沙海底峡谷演化分为3个阶段:(1)早中新世晚期-中中新世,峡谷初始发育阶段;(2)晚中新世,峡谷拓展阶段;(3)上新世以来,现代峡谷发育阶段.东沙海底峡谷向马尼拉海沟提供了充足的富有机质沉积物,构成了马尼拉海沟增生楔天然气水合物形成的重要物质基础.

       

    • 图  1  研究区所处区域地质背景(a);研究区区域海洋背景(b);研究区海底地貌及测线位置(c)

      图b中1~4分别代表东沙海底峡谷、台湾峡谷、澎湖峡谷群和高屏峡谷

      Fig.  1.  Index map displaying the geological background of the study area in the northern South China Sea (a); index map showing the oceanographic background of the study area (b); zoom-in bathymetric map displaying the location of the seismic lines (c)

      图  2  南海北部综合地层柱状图

      红色三角代表岩浆活动主要时期

      Fig.  2.  Chronostratigraphic chart of the northern South China Sea

      图  3  典型地震地层格架剖面

      a.未解释剖面;b.解释剖面

      Fig.  3.  Representative seismic profile showing the seismic-stratigraphic framework

      图  4  东沙海底峡谷现代海底地貌(a);局部典型地貌放大图(b~d);典型地形剖面(e~g)

      Fig.  4.  Bathymetric map of the present Dongsha submarine canyon (a); zoom-in maps of the typical topographic features (b-d); typical bathymteric profiles (e-g)

      图  5  峡谷C2(a和b)和C5(c和d)上游段地震反射特征及其解释

      Fig.  5.  Seismic-reflection features and the corresponding interpretation of the upper segments of C2 (a and b) and C5 (c and d), respectively

      图  6  峡谷中游段受后期岩浆活动改造的新生代基底(Tg)构造顶面

      Fig.  6.  Time structure map for the Cenozoic base (Tg) that was reworked by the late magmatism activities at the middle segment of the canyon

      图  7  CI峡谷体系中游段地震反射特征(a)及解释剖面(b)(位置见图 3a)

      Fig.  7.  Seismic-reflection features (a) and the corresponding interpretation (b) of the middle segment of the CI system (see the location in Fig. 3a)

      图  8  CII峡谷体系中游段地震反射特征(a)及解释剖面(b)(位置见图 3a)

      Fig.  8.  Seismic-reflection features (a) and the corresponding interpretation (b) of the middle segment of the CII system (see the location in Fig. 3a)

      图  9  东沙海底峡谷沉积演化模式

      蓝色箭头示意重力流向峡谷头部汇聚;IW指示内波;SC指示南海北部西南向陆坡环流;红色虚线指代沉积物沿峡谷搬运的主要路径

      Fig.  9.  Sedimentary evolution model of the Dongsha submarine canyon

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