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    南海南部沉积物波:软变形及其触发机制

    王龙樟 姚永坚 林卫兵 徐行 肖娇静 沈奥 徐乔

    王龙樟, 姚永坚, 林卫兵, 徐行, 肖娇静, 沈奥, 徐乔, 2018. 南海南部沉积物波:软变形及其触发机制. 地球科学, 43(10): 3462-3470. doi: 10.3799/dqkx.2018.303
    引用本文: 王龙樟, 姚永坚, 林卫兵, 徐行, 肖娇静, 沈奥, 徐乔, 2018. 南海南部沉积物波:软变形及其触发机制. 地球科学, 43(10): 3462-3470. doi: 10.3799/dqkx.2018.303
    Wang Longzhang, Yao Yongjian, Lin Weibing, Xu Xing, Xiao Jiaojing, Shen Ao, Xu Qiao, 2018. Sediment Waves in the South of South China Sea: Soft Sediment Deformation and Its Triggering Mechanism. Earth Science, 43(10): 3462-3470. doi: 10.3799/dqkx.2018.303
    Citation: Wang Longzhang, Yao Yongjian, Lin Weibing, Xu Xing, Xiao Jiaojing, Shen Ao, Xu Qiao, 2018. Sediment Waves in the South of South China Sea: Soft Sediment Deformation and Its Triggering Mechanism. Earth Science, 43(10): 3462-3470. doi: 10.3799/dqkx.2018.303

    南海南部沉积物波:软变形及其触发机制

    doi: 10.3799/dqkx.2018.303
    基金项目: 

    国家自然科学基金项目 91428205

    国家自然科学基金项目 41576068

    中国地质调查局项目 DD20160138

    详细信息
      作者简介:

      王龙樟(1965-), 男, 教授, 主要从事海洋地质和油气地质的教学与研究工作

    • 中图分类号: P67

    Sediment Waves in the South of South China Sea: Soft Sediment Deformation and Its Triggering Mechanism

    • 摘要: 目前,沉积物波的成因还是存在很多争议.通过详细的地震资料解释,发现南海南部海域有一个规模巨大的海底滑坡,滑坡体长达160 km.从剖面上看,滑坡体结构完整,由减损带、加积带、滑阻带、破坏体、滑脱面、滑坡后壁、冠上裂缝、横向裂缝等结构要素组成.在如此低的海底坡度(仅0.3°~0.5°)上形成如此大规模的滑坡体,推测是地震活动触发的.加积带内发育沉积物波.形态特征和剪应力分析显示,沉积物波形成于减损带的推挤作用.加积带中部推力最大,导致下部为逆时针剪切,上部为顺时针剪切.因此,沉积物波属于海底滑坡引起的软沉积物变形.软变形沉积物波是海底滑坡的一种特殊标志,因此这项研究有助于发现海底滑坡,也有助于海底工程的减灾防灾工作.

       

    • 图  1  南海沉积物波的发育位置及测线位置

      ①马尼拉海沟; ②澎湖峡谷; ③台湾浅滩南峡谷; ④东沙东峡谷; ⑤神弧峡谷群; ⑥珠江口外峡谷; ⑦琼东南中央峡谷; ⑧西北巴拉望盆地

      Fig.  1.  Location of sediment wave and seismic profile

      图  2  地震反射剖面AA'及其地质解释

      a.偏移地震反射剖面; b.地质解释.剖面位置见图 1

      Fig.  2.  Seismic reflection profile AA' and its geological interpretation

      图  3  地震反射剖面BB'及其地质解释

      剖面位置见图 1

      Fig.  3.  Seismic reflection profile BB' and its geological interpretation

      图  4  沉积物波的地震反射特征及形成机制

      Fig.  4.  Seismic reflection characteristics and formation mechanism of sediment waves

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