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    南海西南次海盆两侧陆缘中生代晚期构造接触关系

    朱荣伟 姚永坚 刘海龄 徐子英 聂鑫 杜文波

    朱荣伟, 姚永坚, 刘海龄, 徐子英, 聂鑫, 杜文波, 2021. 南海西南次海盆两侧陆缘中生代晚期构造接触关系. 地球科学, 46(3): 885-898. doi: 10.3799/dqkx.2020.369
    引用本文: 朱荣伟, 姚永坚, 刘海龄, 徐子英, 聂鑫, 杜文波, 2021. 南海西南次海盆两侧陆缘中生代晚期构造接触关系. 地球科学, 46(3): 885-898. doi: 10.3799/dqkx.2020.369
    Zhu Rongwei, Yao Yongjian, Liu hailing, Xu Ziying, Nie Xin, Du Wenbo, 2021. Tectonic Contact Relationship of Continental Margins of the Southwest Sub-Basin, South China Sea in Late Mesozoic. Earth Science, 46(3): 885-898. doi: 10.3799/dqkx.2020.369
    Citation: Zhu Rongwei, Yao Yongjian, Liu hailing, Xu Ziying, Nie Xin, Du Wenbo, 2021. Tectonic Contact Relationship of Continental Margins of the Southwest Sub-Basin, South China Sea in Late Mesozoic. Earth Science, 46(3): 885-898. doi: 10.3799/dqkx.2020.369

    南海西南次海盆两侧陆缘中生代晚期构造接触关系

    doi: 10.3799/dqkx.2020.369
    基金项目: 

    国家自然科学金项目 U20A20100

    国家自然科学金项目 41776072

    中国科学院边缘海与大洋地质重点实验室开放基金项目 OMG2019-05

    中国地质调查局项目 DD20190627

    中国地质调查局项目 DD20190366

    中国地质调查局项目 DD20190378

    南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项 GML2019ZD0201

    详细信息
      作者简介:

      朱荣伟(1988-), 男, 工程师, 博士, 主要从事海洋构造地质与油气地质方面研究.ORCID: 0000-0001-8211-2484.E-mail: zhurongwei1209@126.com

      通讯作者:

      姚永坚, E-mail: yjyaomail@163.com

    • 中图分类号: P736

    Tectonic Contact Relationship of Continental Margins of the Southwest Sub-Basin, South China Sea in Late Mesozoic

    • 摘要: 为探究南海西南次海盆两侧陆缘地块在中生代晚期构造接触关系及其对南海形成演化的影响,利用过南海西南次海盆两侧陆缘采集的地球物理资料以及公开发表的数据资料,对两侧陆缘的地壳结构及前新生界构造变形特征进行了研究.研究结果显示,西南次海盆两侧陆缘的地壳结构及物质组成存在差异,属于性质不同的两个微地块;两侧陆缘前新生代地层在晚中生代经历了来自不同方向的挤压作用,且遭受抬升剥蚀.结合南海及邻区中生代花岗岩分布特征及区域构造背景,进一步推测两侧陆缘地块在晚中生代以俯冲碰撞的方式完成拼贴缝合,该俯冲碰撞带是南海北部俯冲带在南海西南方向的延伸,并且新生代南海的扩张可能与该俯冲碰撞带这个先存的软弱带有关,是南海海盆初始破裂的部位.

       

    • 图  1  研究区区域位置及测线分布

      红色虚线框表示研究区范围,底图据杨胜雄等(2015)修改. TXNB.台西南盆地;PRMB.珠江口盆地;QDNB.琼东南盆地;YGHB.莺歌海盆地;ZJNB.中建南盆地;MGB.眉公盆地;WAB.万安盆地;NWXB.南薇西盆地;ZMB.曾母盆地;BKB.北康盆地;LYB.礼乐盆地

      Fig.  1.  The location of the study area and the locations of the multichannel seismic profiles

      图  2  西南次海盆两侧陆缘地块地壳速度结构模型

      a、b剖面位置见图 1;a.OBS973-3测线,修改自et al.(2017);b.OBS973-1测线,修改自丘学林等(2011)

      Fig.  2.  Crustal velocity structure models and 1D velocity structure comparison of the margins of the southwest sub-basin

      图  3  南海西南次海盆两侧陆缘盆地地层柱状图与构造演化简图

      全球海平面变化曲线据Haq et al.(1987)

      Fig.  3.  Comprehensive strata diagram and tectonic evolution stage of the continental marginal basins of the southwestern sub-basin, South China Sea

      图  4  94N10测线地震剖面及其地质解释

      剖面位置见图 1;a.原始地震剖面;b.地震地质解释剖面

      Fig.  4.  Geological interpretation of the seismic line 94N10

      图  5  94N10测线反映多重逆冲构造的典型地震剖面段(a)及其地质解释(b)

      a.图 4中局部放大未解释剖面;b.地质解释剖面

      Fig.  5.  Typical seismic section (a) and geological interpretation (b) of the line 94N10 reflecting multiple thrust structures

      图  6  N973-1测线南段地震剖面及其地质解释

      剖面位置见图 1;a.原始地震剖面;b.地震地质解释剖面

      Fig.  6.  Local seismic section and geological interpretation of the south of the seismic line N973-1

      图  7  TP3测线地震剖面及其地质解释

      剖面位置见图 1;a.原始地震剖面;b.地震地质解释剖面

      Fig.  7.  Local seismic section and geological interpretation of the seismic line TP3

      图  8  TP3测线反映残留褶皱构造放大图

      a.图 7中局部放大未解释剖面;b.地震地质解释剖面

      Fig.  8.  Enlarged view of residual fold structure of the line TP3

      图  9  南海及邻区中生代花岗岩分布特征

      图中南海北部中生代俯冲带位置据闵慧等(2010);南海北部断裂据周蒂等(2006);花岗岩数据综合自Areshev et al.(1992)李平鲁等(1999)Yan et al.(2010)Nguyen et al.(2004a, 2004b)、修淳等(2016)

      Fig.  9.  Distribution characteristics of Mesozoic granites in the South China Sea and its adjacent regions

      图  10  南海及邻区中生代花岗岩构造环境判别图解

      判别模板据Pearce et al. (1984);VAG.火山弧花岗岩;WPG.板内花岗岩;Syn-COLG.同碰撞花岗岩;ORG.洋中脊花岗岩;A-ORG.异常洋中脊花岗岩;PRMB.珠江口盆地;NSB.南沙地块;DZ.大叻地区

      Fig.  10.  Discrimination diagrams of structural environment for Mesozoic granitoids in the South China Sea and its adjacent areas

      图  11  南海北部俯冲带形成示意

      古礼乐北海盆参考Liu et al.(2011)

      Fig.  11.  Schematic diagram of the formation of the Late Mesozoic subduction zone in the northern South China Sea

      图  12  南海中生代以来的构造演化史平面示意

      ZXS.中-西沙地块;NS.南沙地块;LY.礼乐地块. a.三叠世;b.晚侏罗世;c.晚白垩世;d.晚渐新世;e.中中新世

      Fig.  12.  Schematic diagram of the tectonic evolution history of the South China Sea since the Mesozoic

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    • 收稿日期:  2020-11-25
    • 刊出日期:  2021-03-15

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