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    中南-礼乐断裂带在南海海盆北部的时空展布与深部结构

    徐子英 汪俊 姚永坚 唐江浪 高红芳 李学杰

    徐子英, 汪俊, 姚永坚, 唐江浪, 高红芳, 李学杰, 2021. 中南-礼乐断裂带在南海海盆北部的时空展布与深部结构. 地球科学, 46(3): 942-955. doi: 10.3799/dqkx.2020.400
    引用本文: 徐子英, 汪俊, 姚永坚, 唐江浪, 高红芳, 李学杰, 2021. 中南-礼乐断裂带在南海海盆北部的时空展布与深部结构. 地球科学, 46(3): 942-955. doi: 10.3799/dqkx.2020.400
    Xu Ziying, Wang Jun, Yao Yongjian, Tang Jianglang, Gao Hongfang, Li Xuejie, 2021. The Temporal-Spatial Distribution and Deep Structure of the Zhongnan- Liyue Fault Zone in the North of the South China Sea Basin. Earth Science, 46(3): 942-955. doi: 10.3799/dqkx.2020.400
    Citation: Xu Ziying, Wang Jun, Yao Yongjian, Tang Jianglang, Gao Hongfang, Li Xuejie, 2021. The Temporal-Spatial Distribution and Deep Structure of the Zhongnan- Liyue Fault Zone in the North of the South China Sea Basin. Earth Science, 46(3): 942-955. doi: 10.3799/dqkx.2020.400

    中南-礼乐断裂带在南海海盆北部的时空展布与深部结构

    doi: 10.3799/dqkx.2020.400
    基金项目: 

    国家自然科学基金项目 41606080

    国家自然科学基金项目 U20A20100

    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 GML2019ZD0208

    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

    中国地质调查局国家海洋专项项目 GZH201400202

    中国地质调查局国家海洋专项项目 DD20160138

    中国地质调查局国家海洋专项项目 DD20190378

    中国地质调查局国家海洋专项项目 DD20190366

    中国地质调查局国家海洋专项项目 DD20190577

    中国地质调查局国家海洋专项项目 DD20190209

    中国地质调查局国家海洋专项项目 DD20190627

    中国地质调查局国家海洋专项项目 1212011220117

    中国地质调查局国家海洋专项项目 1212011220116

    广东省自然科学基金项目 2017A030312002

    详细信息
      作者简介:

      徐子英(1981-), 女, 高级工程师, 主要从事海洋区域地质构造分析及极地地质研究.ORCID: 0000-0003-3725-7726.E-mail: xuziying19556511@163.com

      通讯作者:

      姚永坚, E-mail: yjyaomail@163.com

    • 中图分类号: P736

    The Temporal-Spatial Distribution and Deep Structure of the Zhongnan- Liyue Fault Zone in the North of the South China Sea Basin

    • 摘要: 中南-礼乐断裂带是协调南海各次海盆扩张的重要断裂.深入研究中南-礼乐断裂带时空展布和深部结构对于认识南海海盆多期次海底扩张和构造演化具有重要意义.本文主要基于深反射多道地震的精细剖析,结合重力、磁力与地形等地质与地球物理资料,揭示了中南-礼乐断裂带在南海海盆北部的时空展布特征、内部构造形变及其深部结构特征.结果表明:中南-礼乐断裂带在西北次海盆与东部次海盆之间宽约25~35 km,北延于珠江海谷西侧(18.7°N,115.5°E),南消失于中沙地块东北侧(17.2°N,116.0°E),主要呈NNW向延伸.该断裂带的主控断裂沿大型海山和侵入岩体分布,主要发育时期是渐新世至早中新世,中中新世至晚中新世为继承性活动,其内部断裂对早中新世及以前的地层具有控制作用,表现为正断层.深部结构上,中南-礼乐断裂带两侧Moho面埋深不一,两侧次海盆的沉积厚度和洋壳厚度存在明显差异,表明该断裂带至少是一条地壳级断裂,甚至可能是岩石圈级断裂.

       

    • 图  1  南海地形图和研究区位置及中南‒礼乐断裂在海盆中的分布

      南海地形图据杨胜雄等(2015);红色框为研究区, 黄色实线是姚伯初(1995)的研究结果, 红色虚线是Ruan et al. (2016)的研究结果, 橙色虚线是Sibuet et al. (2016)的研究结果, 紫色实线是Franke (2013)Barckhausen et al. (2014)的研究结果, 白色和红色实线为徐子英等(2019)研究结果, 白色实线为断裂带的宽度范围, 红色实线为断裂带的主控断裂

      Fig.  1.  The bathymetric map of the SCS, the location of study area and distribution of Zhongnan-Liyue fault zone in the SCS basin

      图  2  研究区地形图和剖面位置及中南‒礼乐断裂空间展布

      地形图据杨胜雄等(2015);红色实线为本文研究的中南‒礼乐断裂带的展布方向和宽度, 黄色实线是姚伯初(1995)的研究结果, 橙色虚线为Sun et al. (2019)研究结果, 黑色实线为剖面测线, 紫色虚线为古扩张脊据Li et al.(2014), 绿色实线为重震联合反演剖面

      Fig.  2.  The bathymetric map of the study area, profile location and the distribute of Zhongnan-Liyue fault

      图  3  中南‒礼乐断裂带在测线L1地震剖面反射特征

      Fig.  3.  The seismic profile characteristics of Zhongnan-Liyue fault zone in the survey line L1

      图  4  中南‒礼乐断裂带在测线L2地震剖面反射特征

      红色粗线为中南‒礼乐断裂带主控断裂

      Fig.  4.  The seismic profile characteristics of Zhongnan-Liyue fault zone in the survey line L2

      图  5  中南‒礼乐断裂带在测线L3地震剖面反射特征

      红色粗线为中南‒礼乐断裂带主控断裂; UCR和LCR为上、下地壳反射面, 下同

      Fig.  5.  The seismic profile characteristics of Zhongnan-Liyue fault zone in the survey line L3

      图  6  中南‒礼乐断裂带在测线L4地震剖面反射特征

      Fig.  6.  The seismic profile characteristics of Zhongnan-Liyue fault zone in the survey line L4

      图  7  中南‒礼乐断裂带在南海海盆磁异常图上的分布位置

      黑色实线为断裂带的宽度

      Fig.  7.  The location of Zhongnan-Liyue fault zone in the magnetic anomaly of South China Sea basin

      图  8  中南‒礼乐断裂带在南海海盆空间重力异常图上的分布位置

      黄色实线为断裂带的宽度

      Fig.  8.  The location of Zhongnan-Liyue fault zone in the free-air gravity anomaly of South China Sea basin

      图  9  L5测线重力异常与地震联合反演剖面

      图中数字为密度值, 单位kg/m3

      Fig.  9.  The free-air gravity anomaly and seismic combined inversion profile of line L5

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    出版历程
    • 收稿日期:  2020-11-03
    • 刊出日期:  2021-03-15

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