| 张平萍,初凤友,李小虎.富钴结壳中矿物组成对稀土元素分布的制约[J].海洋学报,2015,37(5):136-147 |
| 富钴结壳中矿物组成对稀土元素分布的制约 |
| Mineralogical control on REEs distributions in Co-rich crusts |
| 投稿时间：2014-04-18 修订日期：2014-12-18 |
| DOI：10.3969/j.issn.0253-4193.2015.05.013 |
| 中文关键词: 富钴结壳 矿物组合 稀土元素 富集机制 |
| 英文关键词:Cobalt-rich crusts rare earth elements mineral assemblage enriching machanism |
| 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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| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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 Ce3 to 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. |
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