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    利用多波束回波强度进行中太平洋潜鱼海山底质分类

    杨永 何高文 朱克超 姚会强 马金凤 杨胜雄 邓希光

    杨永, 何高文, 朱克超, 姚会强, 马金凤, 杨胜雄, 邓希光, 2016. 利用多波束回波强度进行中太平洋潜鱼海山底质分类. 地球科学, 41(4): 718-728. doi: 10.3799/dqkx.2016.061
    引用本文: 杨永, 何高文, 朱克超, 姚会强, 马金凤, 杨胜雄, 邓希光, 2016. 利用多波束回波强度进行中太平洋潜鱼海山底质分类. 地球科学, 41(4): 718-728. doi: 10.3799/dqkx.2016.061
    Yang Yong, He Gaowen, Zhu Kechao, Yao Huiqiang, Ma Jinfeng, Yang Shengxiong, Deng Xiguang, 2016. Classification of Seafloor Geological Types of Qianyu Seamount from Mid-Pacific Seamounts Using Multibeam Backscatter Intensity Data. Earth Science, 41(4): 718-728. doi: 10.3799/dqkx.2016.061
    Citation: Yang Yong, He Gaowen, Zhu Kechao, Yao Huiqiang, Ma Jinfeng, Yang Shengxiong, Deng Xiguang, 2016. Classification of Seafloor Geological Types of Qianyu Seamount from Mid-Pacific Seamounts Using Multibeam Backscatter Intensity Data. Earth Science, 41(4): 718-728. doi: 10.3799/dqkx.2016.061

    利用多波束回波强度进行中太平洋潜鱼海山底质分类

    doi: 10.3799/dqkx.2016.061
    基金项目: 

    国际海域资源调查与开发“十二五”专项课题 DY125-13-R-01

    国际海域资源调查与开发“十二五”专项课题 DY125-13-R-05

    国际海域资源调查与开发“十二五”专项课题 DY125-13-R-08

    国土资源部海底矿产资源重点实验室基金课题 KLMMR-2013-A-03

    国际海域资源调查与开发“十二五”专项课题 DY125-14-R-01

    详细信息
      作者简介:

      杨永(1982-),男,工程师,主要从事海洋地球物理数据处理与地质解释方面的研究.E-mail: yong0913029@163.com

    • 中图分类号: P3

    Classification of Seafloor Geological Types of Qianyu Seamount from Mid-Pacific Seamounts Using Multibeam Backscatter Intensity Data

    • 摘要: 中、西太平洋海山区是富钴结壳的重要富集区,钙质远洋沉积、碳酸盐岩沉积及重力作用引起的滑塌沉积是海山山顶和斜坡的主要沉积类型,它们的空间分布规律对于富钴结壳的分布至关重要.在国内首次利用EM122多波束回波强度资料对中太平洋潜鱼海山进行了底质类型研究,对回波强度资料进行处理和统计分类,并与浅地层剖面和地质取样结果对比,分析得出了4种底质类型,即富钴结壳、钙质远洋沉积、碳酸盐岩基底及碎屑流沉积.这几种底质类型具有不同的回波强度特征,其中富钴结壳区表现为均一的回波强度高值特征;钙质远洋沉积区表现为均一的回波强度低值特征,二者回波强度值相差约20 dB.结果显示潜鱼海山山顶仅局部发育钙质远洋沉积,大部分为碳酸盐岩基底出露区,山顶边缘及侧翼山脊处为主要的富钴结壳分布区.此外,该海山存在3处较大规模的重力滑塌沉积区,主要为碎屑流沉积.

       

    • 图  1  潜鱼海山海底地形

      Fig.  1.  Seafloor relief sketch of Qianyu seamount

      图  2  海山回波强度

      Fig.  2.  Backscatter intensity of Qianyu seamount

      图  3  海山回波强度统计分类结果

      Fig.  3.  Results of backscatter intensity statistical classification of Qianyu seamount

      图  4  海山综合地质解释结果

      Fig.  4.  Results of synthetic geological interpretation of Qianyu seamount

      图  5  海山浅钻样品

      a.SD01:角砾岩,角砾为黑色结壳碎块,基质为钙质;b.SD02:凝灰岩,浅黄色,含火山碎屑;c.SD03:生物碎屑角砾岩,上层为风化结壳;d.SD04:生物碎屑礁灰岩,灰白色,含生物碎屑;e.SD05:生物碎屑礁灰岩,浅黄色,轻微磷酸盐化;f.SD06:生物碎屑礁灰岩,可见大量生物壳体;g.SD07:灰岩,白色致密,含少量黑色微结核颗粒;h.SD08:泥灰岩,灰白色,可见硅质条带;浅钻位置见图 1

      Fig.  5.  Shallow-drilling core sample of Qianyu seamount

      图  6  回波强度与4 kHz浅地层剖面对比

      剖面位置见图 1

      Fig.  6.  Synthetic profile compared backscatter intensity with 4 kHz sub bottom profile

      图  7  碎屑流沉积回波强度

      Fig.  7.  Backscatter intensity of debris sediment

      图  8  回波强度(a)与结壳样品(b)

      Fig.  8.  Backscatter intensity (a) core sample (b)

      图  9  回波强度特征类型

      Fig.  9.  Types of backscatter intensity feature

      表  1  不同回波强度特征类型及其地质解释

      Table  1.   Different types of backscatter intensity and their geological interpretation

      类型 编号 位置 回波强度特征 地质解释
      山顶边缘 整体高、强度均一,-20 dB左右 富钴结壳
      斜坡底部 整体高、强度均一,-16 dB左右 滑塌岩崩体,落差为320 m
      隆起带 整体高值,-20 dB左右,局部低值,-35 dB左右 小海山,落差为400 m,局部发育沉积
      山顶中部 整体低、强度均一,-40 dB左右 钙质远洋沉积
      坡底海盆 整体低、强度均一,-38 dB左右 深海软泥沉积
      斜坡山脊 整体高值,局部高、低值相间分布,-17~-35 dB 富钴结壳,局部少量沉积分布
      山顶中部 整体较低,且高、低值相间分布,-25~-32 dB 碳酸盐岩基底出露,局部少量沉积分布
      斜坡底部 高、低相间分布,高值区范围大小不一,-21~-34 dB 滑塌碎屑沉积,碎屑大小不一,局部为来自海山的钙质远洋沉积
      下载: 导出CSV
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    • 收稿日期:  2015-06-07
    • 刊出日期:  2016-04-15

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