中太平洋多金属结壳的地球化学特征

张海生; 赵鹏大; 胡光道

中太平洋多金属结壳的地球化学特征

1.
中国地质大学数学地质遥感地质研究所, 湖北武汉 430074
2.
国家海洋局第二海洋研究所, 浙江杭州 310012

基金项目:

大洋矿产资源勘探开发专项基金项目 DY105-01-01-8

详细信息

作者简介:
张海生(1953－), 男, 研究员, 主要从事海洋地球化学与矿产资源研究

中图分类号: P595
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- 被引次数: 0
出版历程
- 收稿日期: 2003-11-17
- 刊出日期: 2004-05-25

Geochemical Features of Multi-Metallic Crust in the Middle Pacific Ocean

1.
Institute of Mathematical Geology and Remote Sensing Geology, China University ofGeosciences, Wuhan 430074, China
2.
Second Institute ofOceangraphy of SOA, Hangzhou 310012, China

摘要

摘要: 采用XRF和ICP AES法对中太平洋CA等6座海山的4 0多个站位的多金属结壳中化学元素进行测试与分析, 并结合其他资料对调查区结壳主要成矿元素的含量组成、特征变化、元素间的相关关系以及结壳与水深、地形等重要环境因子进行探讨.研究表明太平洋海山结壳中元素丰度特征具有多种变化类型, 中太平洋结壳主成分和成矿元素丰度明显高于马绍尔群岛, 而与西北太平洋、麦哲伦海山相近; 中太平洋结壳化学元素相关关系分析表明: Ca与P、Al与K呈显著正相关性; Mn与Al呈显著负相关性.研究还发现中太平洋结壳富Co(0.6 3%)而贫Cu(0.1 1 %)及高Fe(1 6.9%)低Mn(2 1.3%)的分布特征, 与深海多金属结核在含量分布特征上存在较大差异.与多金属结核相比: 结壳中Mn组元素含量显著降低, Fe组元素含量和稀土总量明显增大, 尤其是Co和REEs的变化最为突出。
- 多金属结壳 /
- 地球化学 /
- 中太平洋
Abstract: Multi-metallic crust from seamount is one kind of oceanic mineral resources with the most perspective exploitation. More than forty samples of the multi-metallic crust from six seamounts in the middle Pacific Ocean were analyzed by X-ray fluorescence and ICP-AES. Combining with the published data, the constituent variety and the elemental relationships are discussed under the consideration of the depth and topography of the crust derivation. The results show that the contents of the main ore-forming constituents in the samples from the middle Pacific Ocean are similar to those from the northwest Pacific Ocean and from Magellan, and that are slightly higher than those from Marshall. Obviously positive correlations between Ca and P, as well as Al and K, but negative correlation between Mn and Al, are found in the samples from the middle Pacific Ocean. Higher Co (0.63%), Fe (16.9%) and REEs, but lower Cu (0.11%) and Mn (21.3%) are also found in the middle Pacific Ocean than in the deep-sea multi-metallic nodules. The facts imply that the ore-forming environment of the crust and the nodule is different.
- multi-metal crust /
- geochemistry /
- middle Pacific Ocean.

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图 1 中太平洋结壳与CC区结核成分变化特征

Fig. 1. Changing characters of nodule in CC and crust in middle Pacific Ocean

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图 2 不同海区结壳主要成分变化特征

Fig. 2. Changing characters of main contents in different areas

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图 3 不同海区结壳成矿元素变化特征

Fig. 3. Changing characters of mineralization contentsin different areas

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图 4 Fe、Mn的变化特征

Fig. 4. Changing characters of Fe and Mn in different sea mountains of middle Pacific Ocean

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图 5 中太平洋各海山成矿元素变化特征

Fig. 5. Changing characters of mineralization elements in different sea mountains of middle Pacific Ocean

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图 6 结壳Mn与Al(a), P与Ca (b)和Co与Al(c)相关关系

Fig. 6. Reiationships between amn and Al(a), P and Ca (b), Co and Al(c) of crust

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图 7 结壳Mn与Co相关关系

Fig. 7. Relationship between Mn and Co of crust

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图 8 结壳Co含量与水深关系

Fig. 8. Relationship between water depth and Co of crust

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表 1 中太平洋海山结壳与结核主要元素含量对比

Table 1. comparison of main element contents in middle Pacific Ocean

表 2 中太平洋海山区富钴结壳稀土元素含量

Table 2. REEs contents of Co-rich crust in middle Pacific Ocean

表 3 调查富钴结壳元素相关系数矩阵

Table 3. Correlation coefficient matrix of Co-rich crust contents in investigated areas

表 4 不同结壳类型品位的变化

Table 4. Contents variation of different crust types

参考文献(8)

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[3]	Hein J.R., Schwab W.C., Davis A.S. . 1988. Cobalt- and platinum-rich ferromanganese crusts and associated substrate rocks from the Marshall Islands. Marine Geology, 78: 255- 283. doi: 10.1016/0025-3227(88)90113-2
[4]	Manheim F.T., Lane-Bostwick C.M. . 1989. Chemical composition of ferromanganese crusts in the world ocean: A review and comprehensive database. U.S. Geologic Survey Open-File Report.
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[6]	Pan J.H., Liu S.Q. . 1999. Distribution, composition and element geochemistry of Co-rich crusts in the western Pacific. Acta Geoscientia Sinica, 20(1): 47- 54(in Chinese with English abstract).
[7]	Witshire J., Wen X. Y., Yao D. . 1999. Ferromanganese crusts near Johnston Island: Geochemistry, stratigraphy and economic potential. Marine Georesources and Geotechnology, 17: 257- 270. doi: 10.1080/106411999273936
[8]	潘家华, 刘淑琴. 1999. 西太平洋富钴结壳的分布、组成及元素地球化学. 地球学报, 20(1): 47- 54. https://www.cnki.com.cn/Article/CJFDTOTAL-DQXB901.006.htm