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    东太平洋CCFZ区多金属结核元素富集机制:来自结核剖面原位微区分析

    张聪 李小虎 李洁 祝飞扬 董彦辉 初凤友

    张聪, 李小虎, 李洁, 祝飞扬, 董彦辉, 初凤友, 2022. 东太平洋CCFZ区多金属结核元素富集机制:来自结核剖面原位微区分析. 地球科学, 47(2): 742-756. doi: 10.3799/dqkx.2021.063
    引用本文: 张聪, 李小虎, 李洁, 祝飞扬, 董彦辉, 初凤友, 2022. 东太平洋CCFZ区多金属结核元素富集机制:来自结核剖面原位微区分析. 地球科学, 47(2): 742-756. doi: 10.3799/dqkx.2021.063
    Zhang Cong, Li Xiaohu, Li Jie, Zhu Feiyang, Dong Yanhui, Chu Fengyou, 2022. Elements Enrichment Mechanism of Polymetallic Nodules in CCFZ area of Eastern Pacific Ocean: In-Situ Microanalysis of Nodule Profile. Earth Science, 47(2): 742-756. doi: 10.3799/dqkx.2021.063
    Citation: Zhang Cong, Li Xiaohu, Li Jie, Zhu Feiyang, Dong Yanhui, Chu Fengyou, 2022. Elements Enrichment Mechanism of Polymetallic Nodules in CCFZ area of Eastern Pacific Ocean: In-Situ Microanalysis of Nodule Profile. Earth Science, 47(2): 742-756. doi: 10.3799/dqkx.2021.063

    东太平洋CCFZ区多金属结核元素富集机制:来自结核剖面原位微区分析

    doi: 10.3799/dqkx.2021.063
    基金项目: 

    中国大洋协会“十三五”资源环境项目 DY135-N1-1

    中国大洋协会“十三五”资源环境项目 DY135-G2-1-03

    中国大洋协会“十三五”资源环境项目 DY135-S2-2-05

    中央级公益性科研院所基本科研业务费专项 JT1701

    中国地质调查局地质调查项目 DD20191043

    详细信息
      作者简介:

      张聪(1992-), 男, 硕士研究生, 主要从事海底资源与成矿系统的研究.ORCID: 0000-0002-0011-2913.E-Mail: zhangcong365@outlook.com

      通讯作者:

      李小虎, E-Mail: xhli@sio.org.cn

    • 中图分类号: P744.3

    Elements Enrichment Mechanism of Polymetallic Nodules in CCFZ area of Eastern Pacific Ocean: In-Situ Microanalysis of Nodule Profile

    • 摘要: 多金属结核微层原位微区分析能够更好地揭示结核生长过程中元素的赋存和迁移过程,为认识多金属结核元素富集机制和成因提供新的证据.通过使用电子探针(EPMA)和激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)等手段对采集自东太平洋克拉里昂-克利珀顿断裂区(CCFZ区)的多金属结核进行了分析研究.研究结果表明,结核矿物主要为水羟锰矿、10Å锰矿和FeOOH,锰铁矿物圈层由内而外可划分为4个明显的层组:L1、L2、L3和L4,Mn和Fe的平均含量分别为32.2和13.3%、39.1和5.2%、37.0和3.4%、33.1和7.8%,Mn/Fe值整体表现为增大的趋势,对应Mn/Fe值分别为2.8、16.6、19.7和10.6,Co+Ni+Cu含量变化与之相似,平均含量分别为1.9%、3.3%、3.8%和3.0%.元素含量关系表明,Co主要赋存在水成成因的水羟锰矿中,Ni、Cu主要赋存在Mn相矿物中,但成岩成因的10Å锰矿对Ni、Cu等元素的富集能力强于水羟锰矿;结合元素组成和显微构造将其划分为水成型层、混合型层、成岩型层和混合型层,结核整体的生长作用趋势从水成型转变为成岩型.

       

    • 图  1  研究区范围及采样点位置

      Fig.  1.  Study area and sampling location

      图  2  结核样品手标本照片和结核剖面

      图中红点为原位点测试位置,黄色线处为线扫描和面扫描区域

      Fig.  2.  Morphological features and inner structures of the polymetallic nodules

      图  3  结核各圈层上的显微构造

      区域A、B为面扫描区域,L2a、L2b分别代表暗、亮色矿物带

      Fig.  3.  Microstructure of nodule layers

      图  4  结核各圈层中金属元素的含量变化

      Fig.  4.  Variation of metal elements in different layers of nodules

      图  5  结核中由内而外Mn/Fe值变化趋势图

      Fig.  5.  Trend of Mn / Fe values from inside to outside in nodules

      图  6  结核中由内而外REY、Ni、Cu和Co含量变化图

      Fig.  6.  Variation of Rey, Ni, Cu and Co contents in nodules from inside to outside

      图  7  结核剖面圈层元素面扫描图

      扫描区域见图 2图 3所示

      Fig.  7.  Elements scanning areas in nodule section

      图  8  多金属结核成因类型三角图解

      水成和成岩型点分别被虚线框圈

      Fig.  8.  Triangular diagram of the genesis of polymetallic nodules

      图  9  结核圈层测点的CeSN/CeSN* vs Nd和CeSN/CeSN* vs YSN/HoSN判别图

      Fig.  9.  CeSN/CeSN* vs Nd和CeSN/CeSN* vs YSN/HoSN diagram of the genesis of polymetallic nodules

      图  10  结核内部Mn、Fe含量变化图

      Fig.  10.  Variation diagram of Mn and Fe contents inthe nodule

      图  11  结核剖面中Cu、Ni、Co、REY随Mn、Fe含量变化图

      Fig.  11.  Variation of Cu, Ni, CO and REY with Mn and Fe contents in nodule section

      图  12  结核剖面中Mn、Fe相矿物与Cu、Ni、Co、REY元素关系协变图

      Fig.  12.  Covariance diagram of relationship between Mn, Fe phase minerals and Cu, Ni, CO, REY elements in nodule section

      图  13  各圈层的稀土模式配分图

      Fig.  13.  REY distribution patterns of each layer of the sample, normalised to PAAS

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