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太平洋海山富钴结壳稀土和铂族元素赋存状态研究

高晶晶 刘季花 张辉 汪虹敏 崔菁菁 何连花

高晶晶,刘季花,张辉,等. 太平洋海山富钴结壳稀土和铂族元素赋存状态研究[J]. 海洋学报,2021,44(x):1–11 doi: 10.12284/hyxb2021194
引用本文: 高晶晶,刘季花,张辉,等. 太平洋海山富钴结壳稀土和铂族元素赋存状态研究[J]. 海洋学报,2021,44(x):1–11 doi: 10.12284/hyxb2021194
Gao Jingjing,Liu Jihua,Zhang Hui, et al. Occurrence phases of rare earth elements and platinum group elements in cobalt-rich crusts from the Pacific Seamount[J]. Haiyang Xuebao,2021, 44(x):1–11 doi: 10.12284/hyxb2021194
Citation: Gao Jingjing,Liu Jihua,Zhang Hui, et al. Occurrence phases of rare earth elements and platinum group elements in cobalt-rich crusts from the Pacific Seamount[J]. Haiyang Xuebao,2021, 44(x):1–11 doi: 10.12284/hyxb2021194

太平洋海山富钴结壳稀土和铂族元素赋存状态研究

doi: 10.12284/hyxb2021194
基金项目: 国家自然科学基金项目(40976038);国际海域资源调查开发“十三五”资源环境课题(DY135-C1-1-04)
详细信息
    作者简介:

    高晶晶(1980—),女,山东省青岛市人,工程师,主要从事海洋地球化学分析研究。E-mail:gaojingjing8@163.com

    通讯作者:

    刘季花(1965—),女,研究员,主要从事海洋沉积地球化学研究。E-mail:jihliu@fio.org.cn

  • 中图分类号: P744

Occurrence phases of rare earth elements and platinum group elements in cobalt-rich crusts from the Pacific Seamount

  • 摘要: 利用等离子体发射光谱法和等离子体质谱法以及相态分析手段,对太平洋海山富钴结壳稀土和铂族元素地球化学特征、赋存状态及富集机制进行研究。结果表明,富钴结壳稀土和铂族元素明显富集,其稀土总量为1 842~2 854 μg/g,铂族总量为144~1 180 ng/g,老壳层中稀土和铂族元素含量明显高于新壳层,这可能与老壳层发生磷酸盐化作用有关。轻稀土元素明显高于重稀土元素,呈现Ce正异常而Eu无异常,具有明显Ce富集特征。铂族元素之间发生了明显分异作用,PPGE含量明显高于IPGE,表现出明显Pt正异常而Pd负异常,具有明显Pt富集而Pd亏损特征。稀土元素赋存状态显示,新壳层中稀土元素主要赋存于铁氧化物相,其富集比例为65.40%~70.05%,老壳层中稀土元素主要赋存于残渣态62.27%~65.77%,这可能与残渣态中磷酸盐有关。铂族元素赋存状态显示,新壳层和老壳层中铂族元素都主要赋存于铁氧化物相,其富集比例为63.66%~69.51%,残渣态(29.20%~34.68%)对铂族元素也有一定的富集能力。富钴结壳稀土和铂族元素的富集推测为铁氧化物胶体粒子的吸附作用,受海水氧化性环境影响,可溶性Ce3+和Pt2+分别被氧化成不溶性Ce4+和Pt4+,沉淀被吸附到铁氧化物相中,从而造成富钴结壳稀土和铂族元素的富集。
  • 图  1  富钴结壳XD3样品采集站位位置

    Fig.  1  The sampling location of cobalt-rich crust XD3

    图  2  富钴结壳XD3样品分层取样

    Fig.  2  The stratification of cobalt-rich crust XD3

    图  3  富钴结壳不同构造层中稀土元素配分曲线

    Fig.  3  REE distribution curves of different structural layer in cobalt-rich crusts

    图  4  富钴结壳不同构造层中铂族元素配分曲线

    Fig.  4  PGE distribution curves of different structural layer in cobalt-rich crusts

    图  5  富钴结壳不同构造层中稀土元素赋存状态

    Fig.  5  Occurrence phase of REE in different structural layer of cobalt-rich crusts

    图  6  富钴结壳不同构造层中铂族元素赋存状态

    Fig.  6  Occurrence phase of PGE in different structural layer of cobalt-rich crusts

    图  7  富钴结壳不同构造层在碳酸盐相、锰氧化物相、铁氧化物相和残渣态中稀土元素配分曲线

    Fig.  7  REE distribution curves of carbonate phase, manganese oxide phase, iron oxide phase and residual phase in different structural layer of cobalt-rich crusts

    图  8  富钴结壳不同构造层在碳酸盐相、锰氧化物相、铁氧化物相和残渣态中铂族元素配分曲线

    Fig.  8  PGE distribution curves of carbonate phase, manganese oxide phase, iron oxide phase and residual phase in different structural layer of cobalt-rich crusts

    表  1  富钴结壳不同构造层样品描述

    Tab.  1  Description of different structural layer in cobalt-rich crusts

    样品编号构造层深度/mm样品描述
    XD3(I)第I构造层0~14褐黑色,较致密,表层鲕粒状突起,柱状构造
    XD3(II)第II构造层14~24黑色,致密,柱状构造
    XD3(III)第III构造层24~56黄褐色,疏松,粘土较多,
    树枝状构造
    XD3(IV)第IV构造层56~82黑色,致密,磷酸盐化严重,
    斑杂状构造
    XD3(V)第V构造层82~120亮黑色,致密,较多磷酸盐脉,水平纹状构造
    下载: 导出CSV

    表  2  富钴结壳不同构造层中稀土元素含量

    Tab.  2  REE contents of different structural layer in cobalt-rich crusts

    样号XD3(I)XD3(II)XD3(III)XD3(IV)XD3(V)北美页岩
    La27729728630937532.0
    Ce82092488611141 45973.0
    Pr58.865.359.765.776.47.90
    Nd23525623426130233.0
    Sm46.849.247.049.658.95.70
    Eu11.512.111.312.214.51.24
    Gd58.058.253.160.368.55.20
    Tb9.319.318.198.7110.00.90
    Dy54.053.549.250.759.35.80
    Ho10.311.39.6410.311.71.04
    Er32.031.630.029.633.73.40
    Tm4.574.544.224.164.900.50
    Yb29.728.826.827.131.93.10
    Lu4.484.354.024.044.760.50
    Y19120217530634427.0
    REE1 8422 0071 88523132 854200
    LREE1 4501 6041 52518122 286153
    HREE39340336050156847.4
    LREE/HREE3.693.984.233.614.023.22
    Y/Ho18.417.818.229.729.426.0
    LaN/YbN0.911.001.041.101.141.00
    δCe1.401.441.471.701.871.00
    δEu0.970.990.990.981.011.00
      注:表中元素La-HREE含量单位为μg/g,轻稀土元素(LREE)=La+Ce+Pr+Nd+Sm+Eu,重稀土元素(HREE)=Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu+Y,δCe=2CeN/(LaN+PrN),δEu=2EuN/(SmN+GdN),LaN、CeN、PrN、SmN、EuN、GdN均为北美页岩标准化后的值。北美页岩数据引自文献[27]。
    下载: 导出CSV

    表  3  富钴结壳不同构造层中铂族元素含量

    Tab.  3  PGE contents of different structural layer in cobalt-rich crusts

    样号XD3(I)XD3(II)XD3(III)XD3(IV)XD3(V)C1球粒
    陨石
    Os0.270.300.500.620.24490
    Ir2.792.863.564.792.23455
    Ru7.047.069.4513.15.34710
    Rh9.558.7323.842.010.6130
    Pt1281235471 1142111 010
    Pd1.741.563.465.811.74550
    Au1.311.341.792.811.32140
    PGE1501445881 180231232
    PPGE1411355761 1642241 830
    IPGE10.110.213.518.57.811 655
    PPGE/IPGE14.013.242.662.928.71.11
    Pt/Pd73.879.11581921211.84
    Pt/Ir46.143.2153.523294.52.22
    Pd/Ir0.620.550.971.200.781.21
    Ir/Au2.142.131.991.711.683.25
    δPt8.348.8515.918.913.01.00
    δPd0.090.080.080.070.071.00
      注:表中元素Os-IPGE含量单位为ng/g,Pd组(PPGE)=Rh+Pt+Pd+Au,Ir组(IPGE)=Os+Ir+Ru,δPt=$ {Pt}_{N} $/$ \sqrt{{Rh}_{N} \cdot {Pd}_{N}} $,δPd=$ {Pd}_{N} $/$ \sqrt{{\mathrm{P}\mathrm{t}}_{N} \cdot {\mathrm{A}\mathrm{u}}_{N}} $,RhN、PtN、PdN、AuN均为C1球粒陨石标准化后的值。C1球粒陨石数据引自文献[28]。
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-06-08
  • 修回日期:  2021-08-17
  • 网络出版日期:  2021-09-06

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