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    台湾东部海域台东峡谷沉积特征及其成因

    孙美静 高红芳 李学杰

    孙美静, 高红芳, 李学杰, 2018. 台湾东部海域台东峡谷沉积特征及其成因. 地球科学, 43(10): 3709-3718. doi: 10.3799/dqkx.2017.515
    引用本文: 孙美静, 高红芳, 李学杰, 2018. 台湾东部海域台东峡谷沉积特征及其成因. 地球科学, 43(10): 3709-3718. doi: 10.3799/dqkx.2017.515
    Sun Meijing, Gao Hongfang, Li Xuejie, 2018. Sedimentary Characteristics and Origin of Taitung Canyon in Eastern Waters of Taiwan Island. Earth Science, 43(10): 3709-3718. doi: 10.3799/dqkx.2017.515
    Citation: Sun Meijing, Gao Hongfang, Li Xuejie, 2018. Sedimentary Characteristics and Origin of Taitung Canyon in Eastern Waters of Taiwan Island. Earth Science, 43(10): 3709-3718. doi: 10.3799/dqkx.2017.515

    台湾东部海域台东峡谷沉积特征及其成因

    doi: 10.3799/dqkx.2017.515
    基金项目: 

    国土资源部海底矿产资源重点实验室开放基金 KLMMR-2015-A-11

    中国地质调查局项目 DD20160140

    中国地质调查局项目 DD20160138

    中国地质调查局项目 1212011220117

    中国地质调查局项目 GZH201100301

    中国地质调查局项目 1212011220116

    中国地质调查局项目 GZH201300502

    中国地质调查局项目 GZH201400202

    详细信息
      作者简介:

      孙美静(1986-), 女, 工程师, 硕士, 主要从事海洋地质与沉积学方面研究

    • 中图分类号: P736.21

    Sedimentary Characteristics and Origin of Taitung Canyon in Eastern Waters of Taiwan Island

    • 摘要: 台湾东部峡谷的研究程度较低,对其沉积特征及成因缺乏系统的论述.利用近年来在台湾东部海域获得的地震剖面,对台东峡谷的形态特征、沉积充填以及成因进行了详细的分析.台东峡谷主体位于花东海盆,该部分水深在4 000~5 500 m范围内,以NE方向为主,长度约为160 km,宽度为0.2~14 km.根据峡谷的平面延伸特征,可以将台东峡谷分为3个区段:上游段为NE-NEE走向段、中游段为NE-NNW走向段、下游段为NE走向段直到峡谷嘴部;下切谷剖面形态从上游段的"V"型、中游段的复合形态("UV"并行)逐渐过渡到下游段的"U"型.台东峡谷上游段-中游段滑塌构造发育,峡谷转弯处的侧翼可见波状沉积,其下游段则以沉积充填为主.台东峡谷的成因与构造作用、地形特征和深水沉积作用关系密切.受西南高东北低的地形特征及基底隐伏断裂控制,峡谷总体呈现NE向延伸;重力流作用为峡谷的下切侵蚀和充填提供了动力与物质来源,峡谷从上游段到下游段下切侵蚀能力减弱,谷底充填增厚;峡谷中游段受海山的阻挡,发生转向;峡谷下游段因多条峡谷携带的沉积物汇入和"喇叭状"地形的影响,输送的沉积物在出加瓜脊末端后,形成了大型深水扇.

       

    • 图  1  台湾东部海域花东海盆区域地形特征

      图中标注黑色和红色线为地震测线;红色箭头表示沉积速率,单位为mm/a,据Dadson et al.(2003);底图据Sibuet et al.(2004)

      Fig.  1.  A general bathymetric chart showing topography of eastern Taiwan Island

      图  2  台湾东部海域海底峡谷的冲刷侵蚀特征

      AA′测线位置见图 1

      Fig.  2.  Erosion characteristics of submarine canyon in the eastern waters of Taiwan Island

      图  3  台东峡谷平面展布及典型剖面形态特征

      Fig.  3.  The distribution and morphological feature of typical profiles of Taitung Canyon

      图  4  台东峡谷⑤号典型地震剖面解释图

      Fig.  4.  Typical No.5 seismic profile of Taitung Canyon

      图  5  台东峡谷⑥号典型地震剖面解释

      Fig.  5.  Typical No.6 seismic profile of Taitung Canyon

      表  1  地震数据采集主要参数

      Table  1.   The main parameters of seismic data acquisition

      单道地震 多道地震②号、⑤号、⑥号剖面
      ①号剖面 ③号、④号
      采集船 探宝号 采集船 东勘1号 采集船 探宝号
      震源 GI枪 震源 GI枪 采样率(ms) 2
      采样率(ms) 0.25 采样率(ms) 0.25 地震拖缆道数 480
      偏移距(m) 11.3 偏移距(m) 33 道间距(m) 12.5
      最大输出功率(cu.in) 420 最大输出功率(in3) 1 180 最大覆盖次数(次) 80
      枪阵总容量(cu.in) 5 080
      下载: 导出CSV

      表  2  台东峡谷不同区段剖面的峡谷参数统计

      Table  2.   Morphology parameter statistics of different sections of Taitung Canyon

      剖面号 剖面方向 剖面与峡谷相交角度(°) 剖面所处峡谷区段 峡谷截面形态 谷顶宽度(km) 下切海底深度 谷底沉积充填厚度
      双程反射时间(ms) 深度(m) 双程反射时间(ms) 厚度(m)
      NW 90 上游段 V型 9.0 734 551 312 250
      SN 90 上游段 V型 9.1 731 549 300 240
      SN 90 上游段 V型 7.3 688 516
      EW 45 中游段 UV并行 13.5 658 494
      EW 45 中游段 UV并行 8.2 497 373 184 147
      SN 90 下游段 U型 1.8 80 60 847 847
      注:据Le et al.(2015)文献中的地震P波传播速度采用如下数据:海水传播速度为1 500 m/s,浅部沉积物速度为1 600 m/s,⑥号剖面充填沉积较厚速度为2 000 m/s.③、④号剖面为单道地震剖面,资料品质限制,谷底沉积充填厚度不确定.
      下载: 导出CSV
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    • 收稿日期:  2018-01-15
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