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    中国富钴结壳合同区海水的稀土元素特征及其意义

    任江波 邓希光 邓义楠 何高文 王汾连 姚会强

    任江波, 邓希光, 邓义楠, 何高文, 王汾连, 姚会强, 2019. 中国富钴结壳合同区海水的稀土元素特征及其意义. 地球科学, 44(10): 3529-3540. doi: 10.3799/dqkx.2018.258
    引用本文: 任江波, 邓希光, 邓义楠, 何高文, 王汾连, 姚会强, 2019. 中国富钴结壳合同区海水的稀土元素特征及其意义. 地球科学, 44(10): 3529-3540. doi: 10.3799/dqkx.2018.258
    Ren Jiangbo, Deng Xiguang, Deng Yinan, He Gaowen, Wang Fenlian, Yao Huiqiang, 2019. Rare Earth Element Characteristics and Its Geological Implications for Seawater from Cobalt-Rich Ferromanganese Crust Exploration Contract Area of China. Earth Science, 44(10): 3529-3540. doi: 10.3799/dqkx.2018.258
    Citation: Ren Jiangbo, Deng Xiguang, Deng Yinan, He Gaowen, Wang Fenlian, Yao Huiqiang, 2019. Rare Earth Element Characteristics and Its Geological Implications for Seawater from Cobalt-Rich Ferromanganese Crust Exploration Contract Area of China. Earth Science, 44(10): 3529-3540. doi: 10.3799/dqkx.2018.258

    中国富钴结壳合同区海水的稀土元素特征及其意义

    doi: 10.3799/dqkx.2018.258
    基金项目: 

    南方海洋科学与工程广东省实验室(广州)项目 GML2019ZD0106

    自然资源部海底矿产资源重点实验室开放基金 KLMMR-2017-A-01

    中国地质调查局项目 DD20191009

    国际海域资源调查与开发"十三五"课题 DY135-C1-1-04

    国际海域资源调查与开发"十三五"课题 DY135-R2-1-05

    国家自然科学基金 41803026

    详细信息
      作者简介:

      任江波(1985—), 男, 高级工程师, 硕士, 主要从事地球化学和海洋地质研究

    • 中图分类号: P736.4

    Rare Earth Element Characteristics and Its Geological Implications for Seawater from Cobalt-Rich Ferromanganese Crust Exploration Contract Area of China

    • 摘要: 通过对西太平洋34件海水样品的稀土元素(REY:REE+Y)测试及其与研究区富钴结壳稀土耦合特征分析,揭示了海水稀土特征及其成因.海水的稀土含量随水深呈现逐渐增加的趋势,∑ REY范围为14.0×10-12~65.5×10-12,平均值为31.9×10-12,其中Y的绝对值(均值为6.0×10-12~24.1×10-12)和相对值((Y/Ho)N均值为1.98)均较高,La含量次之(均值为1.8×10-12~11.6×10-12),Ce含量相对较低(均值为2.4×10-12~8.8×10-12),δCe范围为0.33~1.03(均值为0.66),(La/Yb)N平均值为0.71.海水稀土元素北美页岩标准化后显示左倾模式,具有显著的Ce负异常、Y正异常和无明显的Eu异常特征.研究区普遍发育水成成因的富钴结壳,即其稀土元素和其他组分均源自海水.富钴结壳的稀土含量相对海水富集6~7个数量级,其Ce正异常和Y负异常的稀土模式与海水构成良好的耦合关系,指示富钴结壳类组分对海水稀土清扫具有选择性,是造成海水稀土模式的重要因素.海山上发育的磷块岩以及周围盆地深海泥中的磷酸盐组分,它们具有较高的稀土含量和类似于海水的稀土模式,指示海洋磷酸盐消耗稀土时并未分馏而是继承海水模式.海水独特的稀土模式特征是补给与消耗平衡作用的结果,铁锰氧化物和海洋磷酸盐是两种典型的海洋自生组分,它们对海水稀土特征的形成至关重要.

       

    • 图  1  中国富钴结壳勘探合同区位置图

      海山基岩年龄数据据Koppers et al.(2003)

      Fig.  1.  The location of cobalt-rich ferromanganese crust exploration contract area of China

      图  2  海水稀土含量及相关比值

      Fig.  2.  Plots of Y vs. rare earth elements of cobalt-rich ferromanganese crust

      图  3  MCCTD1504测站各稀土元素含量剖面特征

      Fig.  3.  The rare earth element profile of seawater column of site MCCTD1504

      图  4  MACTD28和MCCTD1504测站稀土含量剖面与溶解氧含量、pH值、PO43-特征

      Fig.  4.  [DO], pH, PO43- and REE characteristics of seawater column of sites MACTD28 and MCCTD1504

      图  5  海水稀土元素北美页岩标准化图

      Fig.  5.  NASC-normalized REY patterns for seawater

      图  6  西太平洋海山富钴结壳(a~b)和海洋磷块岩(c~d)稀土元素北美页岩标准化图

      图a, b数据据任向文等(2011); 任江波等(2017a);图c数据来自西太平洋海山磷块岩据潘家华等(2002);图d数据据McArthur and Walsh(1984); Hein et al.(1993)

      Fig.  6.  NASC-normalized REY patterns for ocean phosphorites(a-b) and ocean phosphorites(c-d)

      图  7  海水稀土元素补给与消耗示意图

      Fig.  7.  Sketch map of supply and consume of seawater REY

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    • 收稿日期:  2018-12-28
    • 刊出日期:  2019-11-11

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