中太平洋莱恩海山富钴结壳元素地球化学特征及成因

刘家岐, 兰晓东

刘家岐,兰晓东. 中太平洋莱恩海山富钴结壳元素地球化学特征及成因[J]. 海洋地质与第四纪地质,2022,42(2): 81-91. DOI: 10.16562/j.cnki.0256-1492.2021041901
引用本文: 刘家岐,兰晓东. 中太平洋莱恩海山富钴结壳元素地球化学特征及成因[J]. 海洋地质与第四纪地质,2022,42(2): 81-91. DOI: 10.16562/j.cnki.0256-1492.2021041901
LIU Jiaqi,LAN Xiaodong. Element geochemistry and genesis of cobalt-rich crust on the Line Seamount of the Central Pacific[J]. Marine Geology & Quaternary Geology,2022,42(2):81-91. DOI: 10.16562/j.cnki.0256-1492.2021041901
Citation: LIU Jiaqi,LAN Xiaodong. Element geochemistry and genesis of cobalt-rich crust on the Line Seamount of the Central Pacific[J]. Marine Geology & Quaternary Geology,2022,42(2):81-91. DOI: 10.16562/j.cnki.0256-1492.2021041901

中太平洋莱恩海山富钴结壳元素地球化学特征及成因

基金项目: 中国大洋协会“十三五”重大项目“太平洋靶区多金属结核矿石与矿物研究”(DY135-N2-1-01)
详细信息
    作者简介:

    刘家岐(1998—),男,硕士研究生,从事海洋地质资源方面的研究,E-mail:lanternqi@163.com

  • 中图分类号: P736.21

Element geochemistry and genesis of cobalt-rich crust on the Line Seamount of the Central Pacific

  • 摘要: 富钴结壳是一种经济价值高、开发前景好的海洋矿产资源,其外部形态、内部构造和地球化学特征记录了古海洋环境的演变信息。本次研究借助富钴结壳细致分层的显微构造及元素地球化学的差异分析,探讨中太平洋莱恩海山富钴结壳成因及形成过程。富钴结壳样品由上至下可分为5层,顶部较致密Ⅰ层黑褐色,表面光滑,杂质较少,具有雪松状叠层石构造,反映了沉积水动力较强;较致密Ⅱ层与Ⅰ层宏观特征类似,具有柱状和胡萝卜状叠层石构造,沉积水动力最强;疏松Ⅲ层和疏松Ⅳ层黄褐色,内含沉积物杂质,多见斑杂状构造,沉积水动力比较弱;致密Ⅴ层为磷酸盐层,具有亮黑色的沥青光泽,富含有孔虫化石,底部Ⅴ层Sr、P、Ca等元素明显富集,表明了海洋生物的明显参与,沉积水动力最弱。莱恩海山Ce异常及高钴高锰低铁特征,表明结壳长期处于氧化环境;而Mn、Fe、Co等元素地球化学特征综合表明,海洋水动力及氧化性总体表现为由底部Ⅴ层至Ⅱ层氧化性逐渐增强,至顶部Ⅰ层有所减弱的趋势;依据元素分配系数、Ce正异常、Ho正异常、Y负异常及成因三角图,判定结壳为南极底流影响下的海水成因。综合结壳年代学数据,在元素剖面中记录了三期磷酸盐化事件,恢复了莱恩海山富钴结壳的生长过程。
    Abstract: Cobalt rich crust is a kind of marine mineral resource with high economic value and significant development prospect. The external morphology, internal structure and geochemical characteristics of the crust recorded the evolution of paleoceanographic environment. In this paper, the genesis or forming process of the cobalt rich crusts on the Line Seamount of the Central Pacific Ocean is studied upon the basis of microstructure and element geochemistry. The cobalt rich crust sample is composed of five layers from top to bottom. The top layer is relatively dense, dark brown in color with smooth surface and little impurities. It has a cedar-like stromatolite structure, indicating a strong hydrodynamic environment; The second layer has similar macroscopic characteristics with the first, characterized by columnar and carrot shaped stromatolite structure, which indicates the strongest hydrodynamic deposition; The third and fourth layers are yellowish brown in color, with patchy structures containing certain amount of sediment impurities suggesting weak hydrodynamics; The fifth is a phosphatic layer with bright black asphalt luster, and rich in foraminifera fossils. Meanwhile, the fifth layer is rich in Sr, P, Ca and other elements, indicating obvious involvement of marine organisms and the weakest hydrodynamics. The geochemical characteristics of Ce anomaly and high Co, high Mn and low Fe indicate that the cobalt rich crust was formed in an oxidizing environment for a long time. The geochemical characteristics of Mn, Fe, Co and other elements reveal that the marine hydrodynamic and oxidizability of the environment gradually increases starting from the fifth on bottom layer up to the second layer, but decreases at the first or top layer. According to the distribution coefficients of the elements, positive anomaly of Ce, positive anomaly of Ho, negative anomaly of Y and the triangle genesis diagram, it is inferred that the cobalt-rich crust of the Line Seamount is formed in seawater environment under the influence of the Antarctic bottom current. Based on the geochronological data of the cobalt rich crusts, the growth process of the cobalt rich crusts is recovered in the paper, and three phosphorylation events are recognized on the element profile.
  • 图  1   中太平洋位置图

    a. 莱恩海山地理位置图,b. 洋流运移示意图。

    Figure  1.   Location map of Line Seamount in the Central Pacific

    a. Geographical location map of Line Seamount, b. schematic diagram of ocean current migration.

    图  2   莱恩海山富钴结壳手标本及分层

    Figure  2.   Hand specimens of the Line Seamount and stratification of cobalt rich crusts

    图  3   莱恩海山结壳样品显微照片及背散射照片

    a、b. 雪松状构造,Ⅰ层;c、d. 胡萝卜状构造,Ⅱ层;e. 斑杂状构造,Ⅲ层;f. 斑杂状构造,Ⅳ层;g. 均匀状,缓波状构造,Ⅴ层;h-l分别为Ⅴ-Ⅰ层的背散射照片,h中可见有孔虫生物沉积。

    Figure  3.   Micrographs and backscatter photographs of the crust from the Line Seamount

    a&b. Cedar structure, first layer; c&d. carrot structure, second layer; e. speckle structure, third layer; f. speckle structure, fourth layer; g. homogeneous structure, fifth layer; h-l are the backscattering images of layer Ⅴ-Ⅰ, respectively. Foraminiferal biodeposition can be seen in h foraminiferal biodeposition.

    图  4   莱恩海山富钴结壳部分元素分配系数与其滞留时间的关系

    Figure  4.   Relationship between partial element partition coefficients and residence time of cobalt rich crusts on the Line Seamount

    图  5   莱恩海山富钴结壳-海水与深海黏土-海水分配系数的关系

    Figure  5.   Relationship between the distribution coefficient of cobalt-rich crust, deep sea clay and seawater on the Line Seamount

    图  6   富钴结壳各层北美页岩标准化稀土配分模式

    a.本文数据,b.莱恩海山MP2海山样品[19],c.麦哲伦海山磷酸盐化板状富钴结壳[30],d.麦哲伦海山未磷酸盐化板状富钴结壳[30]。北美页岩数据引自文献[31],海水数据引自文献[32]。

    Figure  6.   Standardized rare earth partitioning model for North American shale layers of cobalt-rich crusts

    a. Data from this paper, b. MP2 seamount samples from Line Seamount[19], c. phosphorylated tabular cobalt-rich crusts of the Magellan Seamount[30], d. unphosphorylated tabular cobalt-rich crusts of the Magellan Seamount[30].North American shale data from reference [31], seawater data from reference [32].

    图  7   莱恩海山富钴结壳的三角成因判别图[30]

    Figure  7.   Trigonometric genetic discriminant map of cobalt-rich crust in the Line Seamount [30]

    图  8   莱恩海山富钴结壳综合信息图

    *引自文献[12-14],#引自文献[16],**引自文献[37],生长模式图据文献[38]修改。

    Figure  8.   Comprehensive information of cobalt-rich crust in the Line Seamount

    * Quoted from references [12-14], # quoted from references [16], ** quoted from references [38], growth model diagram modified according to [38].

    表  1   莱恩海山电子探针元素分析

    Table  1   Electron probe element analysis of the Line Seamount

    %  
    测点层位Na2OFeOP2O5MgOMnOCaOCoOK2OZnOSO3CuO总量
    D11.050.0730.950.2751.670.030.091.1989.07
    D21.150.0431.140.3447.360.030.041.2185.11
    D31.020.0631.180.2747.550.041.4384.99
    D41.4124.811.052.3120.792.090.450.790.090.380.0454.21
    D52.3220.860.831.7929.913.100.630.470.030.750.1160.80
    D61.2620.530.852.1131.473.590.840.900.500.1262.17
    D72.7411.440.482.5639.093.321.060.780.040.510.1962.21
    D82.2915.090.561.9438.633.581.130.530.090.790.0964.72
    D92.9512.870.592.2736.203.411.300.610.110.590.0960.99
      注:测点D1 —D9见图3h-l,D4—D9见图7投点。
    下载: 导出CSV

    表  2   莱恩海山结壳样品分层微量元素含量

    Table  2   Trace elements of layered cobalt rich crusts on the Line Seamount

    μg/g  
    样品编号分层CoNiCuZnVCrSrMoBaWPbThUTh/UNi/Co
    Q1


    10 4443 0383924976127.771 5604921 01293.21 71715.812.01.320.29
    Q210 3113 1205005205639.161 6264491 11599.81 5458.811.90.740.24
    Q3

    9 9243 5616185025368.861 4324641 19899.91 5547.8411.20.700.36
    Q46 6733 37379055952113.41 5583661 31579.21 3339.7810.20.960.51
    Q5

    10 4256 0039657145991.191 6626241 723127.01 3492.5111.90.210.58
    平均值9 5553 8196535885668.081 5684791 27399.81 5008.9511.40.790.39
    下载: 导出CSV

    表  3   莱恩海山富钴结壳样品稀土元素

    Table  3   Analysis table of rare earth elements of cobalt rich crust samples from the Line Seamount

    样品
    编号
    分层LaCePrNdSmEuGdTbDyHoErTmYbLuYLREE/
    HREE
    (La/Sm)N(Gd/Yb)NY/HoδCeδEuδGdδY
    Q123368243.618938.49.8840.37.1241.89.2727.94.4827.14.171857.380.830.8919.961.461.100.950.85
    Q220265729.714928.87.4933.2632.98.3123.44.0626.74.011597.750.730.7419.131.791.060.970.86
    Q317178628.913026.46.8128.75.1627.56.5419.63.56223.531339.860.750.7820.342.391.080.960.89
    Q421376139.318235.78.9939.16.8536.28.5225.53.9524.73.961908.330.840.9422.301.791.050.980.98
    Q523277538.316732.27.1233.06.1733.28.1324.83.9425.54.002189.020.880.7726.811.760.960.981.19
      注:稀土元素单位为μg/g,δCe=2*CeN/(LaN+PrN),δY=2*YN/(DyN+HoN),δEu、δGd的计算方法类似,N为经北美页岩标准化后的数据,北美页岩数据取自文献[31]。
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-04-18
  • 修回日期:  2021-08-27
  • 网络出版日期:  2021-09-15
  • 刊出日期:  2022-04-27

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