富钴结壳中矿物组成对稀土元素分布的制约

张平萍; 初凤友; 李小虎

doi:10.3969/j.issn.0253-4193.2015.05.013

富钴结壳中矿物组成对稀土元素分布的制约

doi: 10.3969/j.issn.0253-4193.2015.05.013

1.
国家海洋局海底科学重点实验室, 浙江杭州 310012;国家海洋局第二海洋研究所, 浙江杭州 310012;浙江大学海洋学院, 浙江杭州 310058
2.
国家海洋局海底科学重点实验室, 浙江杭州 310012;国家海洋局第二海洋研究所, 浙江杭州 310012

基金项目: 国家海洋局青年海洋科学基金(2011321);国家海洋局第二海洋研究所专项基金(JG1101);国家自然科学基金(41276055,41178045)。

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出版历程
- 收稿日期: 2014-04-18
- 修回日期: 2014-12-18

Mineralogical control on REEs distributions in Co-rich crusts

1.
Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Ocean College, Zhejiang University, Hangzhou 310058, China
2.
Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China;Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

摘要

摘要: 为探讨富钴结壳中矿物组成对稀土元素分布的制约,对约翰斯顿岛富钴结壳中矿物组成及稀土元素特征进行了研究。依据主要矿物组成,富钴结壳可以分为3种类型,分别命名为A、B、C。由A到C,水羟锰矿含量逐渐降低,B类中磷灰石含量最高,C类中水钠锰矿和钙锰矿含量最高。A类结壳中富集REE³⁺、Ce,B类结壳中富集Ce和Y。A类富钴结壳中,REE³、Y以专属吸附的方式富集在铁氧化物上,Ce³氧化成Ce⁴与其他REE分离,吸附在锰矿物上。B类结壳中,稀土元素主要以独立矿物的形式存在,另有部分Ce、LREE³吸附于铁相中,部分Y存在于磷灰石中。C类结壳中,稀土元素主要赋存在锰矿物中,部分Y存在于磷灰石中。
- 富钴结壳 /
- 矿物组合 /
- 稀土元素 /
- 富集机制
Abstract: Rare earth elements (REEs) are important tracers for geochemical cycles,and are also world strategic resources. In this study,we investigated the mineral and REEs characteristics of Co-rich crusts from Johnston island to show that REEs distributions are constrained by their mineral compositions. On the basis of their mineral characteristics,the Co-rich crusts can be classified into type A,type B,and type C. The vernadite contents decrease from type A via type B to type C; and type B shows the highest apatite contents. Birnessite and todorokite are enriched in type C crust. Type A crusts are enriched in REE³⁺ and Ce,whereas type B crusts are characterized by high contents of Ce and Y. In type A crust,REE³ and Y that originated from seawater are specified adsorbed on the Fe-phase. Cerium is enriched in Mn-mineral via the oxidation from Ce³to Ce⁴ and separation from other REEs. In type B crust,REEs mainly form independent minerals,part of Ce and LREE³ are absorbed in the Fe-phase,and part of Y enter in apatite. In type C crust,REEs show the enrichment phenomena in Mn-minerals,and also part of Y are absorbed in apatite.
- Cobalt-rich crusts /
- rare earth elements /
- mineral assemblage /
- enriching machanism

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