| 西太平洋海底富钴结壳稀土元素地球化学及其成因意义 |
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| 引用本文：.2009.REE geochemistry of ferromanganese crusts from west Pacific Ocean and its geological implications[J].Mineral Deposits,28(Z):111~122 |
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| 基金项目:国家自然科学基金（40473024、40343019）、国际海底区域研究开发“十五”课题（DY105-01-04-13、DY105-01-02-1）、高等学校博士学科点专项科研基金（20040558049）、中国科学院边缘海地质重点实验室研究基金课题（MSGL08-01，MSGLCAS03-4）和国家教育部跨世纪优秀人才培养计划基金 |
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| 中文摘要:文章对采自西太平洋具典型三层壳层结构的富钴结壳样品稀土元素（REE）含量进行了ICP-MS测定，分析结果表明，西太平洋富钴结壳稀土元素总量（∑REE）很大，δCe明显正异常。就各层而言，从亮煤层到外层∑REE、δCe 、(La/Sm)N和(La/Pr)N是递减的，La的含量从亮煤层到疏松层急剧减少，而疏松层到外层则缓慢增加。Gd/Gd*一直是缓慢减少，而Eu/Eu* 变化不大；与海底水成铁锰结核相比，亮煤层和疏松层具有更大的正Ce异常，外层和成岩型结核一样具有相对负的Ce异常，说明外层的沉积氧化环境较亮煤层和疏松层已变得更还原。富钴结壳中的REE主要来源于海水，成矿机制由单一的水生成因逐渐转变为有海水和热液参与。 |
| 中文关键词:地球化学 富钴结壳 稀土元素 ICP-MS 西太平洋 |
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| REE geochemistry of ferromanganese crusts from west Pacific Ocean and its geological implications |
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| Abstract:The composition of rare earth elements (REE) of three-layered ferromanganese crusts collected from west Pacific Ocean were analyzed by inductively coupled plasma mass spectrometry (ICP-MS), and the results show that high total REE abundance(?REE) and positive Ce anomaly (δCe) are the main characters of the samples. The ∑REE, δCe , (La/Sm)N and (La/Pr)N vary widely over three layers and decline from inner to outer layers. La contents decline dramatically from inner layers to intermediate layer but increase from intermediate layer to outer layer. Gd/Gd* ratios decline slowly, Eu/Eu* ratios show non- or weakly positive Eu anomaly in outer layer. Compared with hydrogenic polymetallic nodules, the inner and intermediate layers of the crust have positive Ce anomaly, and outer layer has negative Ce anomaly, suggesting that the environment of forming inner and intermediate layer ferromanganese crusts are more oxidizing. In addition, the source of the REE in ferromanganese crusts is predominantly seawater. The REE characteristics show that the ferromanganese crust is of hydrogenic origin, while submarine hydrothermal fluid might have added during growth. |
| keywords:geochemistry, ferromanganese crusts, Rare Earth Elements(REE), Inductively Coupled Plasma mass Spectrometry (ICP-MS), West Pacific Ocean |
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