| BIF微量稀土元素分析方法及其在冀东司家营铁矿中的应用 |
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| 引用本文： | 李文君,靳新娣,崔敏利,王长乐.BIF微量稀土元素分析方法及其在冀东司家营铁矿中的应用[J].岩石学报,2012,28(11):3670-3678. |
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| 作者姓名： | 李文君 靳新娣 崔敏利 王长乐 |
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| 作者单位： | 中国科学院地质与地球物理研究所, 中国科学院矿产资源研究重点实验室, 北京 100029;中国科学院地质与地球物理研究所, 中国科学院矿产资源研究重点实验室, 北京 100029;中国科学院地质与地球物理研究所, 中国科学院矿产资源研究重点实验室, 北京 100029;中国地质调查局发展研究中心, 北京 100037;中国科学院地质与地球物理研究所, 中国科学院矿产资源研究重点实验室, 北京 100029 |
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| 基金项目： | 本文受国家重点基础研究发展计划973项目(2012CB416601)和中国科学院知识创新工程重要方向项目群(KZCX-2YW-Q04-07)联合资助. |
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| 摘 要： | 以硅铁条带交替出现为特征的条带状铁建造(BIF)是世界上最重要的铁矿资源类型,精确分析磁铁矿的化学组成具有重要意义。本文开展了磁铁矿样品不同溶样方法分析结果的比对,并详细分析和讨论了冀东司家营铁矿磁铁矿与燧石单条带的微量及REE元素分析的地球化学特征。分析结果表明,对于磁铁矿样品,常规HF+HNO3溶样法与HBr+HNO3组合溶样法具有一致的溶样效果;司家营BIF的Zr,Sc,Th含量极低,表明未受陆源碎屑的污染;铁质与硅质具有低LREE、高HREE、La和Y正异常的海水REE特征,同时具有Eu正异常的热液REE特征;Ce负异常的缺乏,说明当时的古海洋是一个缺氧的环境。研究发现富铁条带的稀土总量大于富硅条带的稀土总量,这可能与硅、铁沉积物的地球化学习性相关,铁质沉积物更易吸收稀土元素。富矿和普通矿石具有原生的热液与海水的混合来源,部分富矿受到后期流体的强烈扰动,甚至表现出热液流体的特征。
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| 关 键 词： | 司家营地区 条带状硅铁建造 富Fe条带 富Si条带 磁铁富矿 |
| 收稿时间： | 2012/7/10 0:00:00 |
| 修稿时间： | 2012/9/15 0:00:00 |
Characterisics of rare earth elements, trace elements and geological significations of BIF from Sijiaying in eastern Hebei |
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| LI WenJun,JIN XinDi,CUI MinLi and WANG ChangLe.Characterisics of rare earth elements, trace elements and geological significations of BIF from Sijiaying in eastern Hebei[J].Acta Petrologica Sinica,2012,28(11):3670-3678. |
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| Authors: | LI WenJun JIN XinDi CUI MinLi and WANG ChangLe |
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| Institution: | Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Development Research Center of China Geology Survey, Beijing 100037, China;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Banded iron formation (BIF), consisting of alternating layers of iron bands and silicon bands, are the most important iron resource in the world. This paper briefly presents two methods of magnetite sample preparation, and focuses on the trace elements and REEs for individual Fe-rich band and Si-rich band. The conventional dissolving method (HF+HNO3) obtains the same effect with the HBr+HF method for the magnetite samples. For the studied samples, crustal contamination can be ruled out on the basis of the generally low concentrations of Th, Zr, Sc. Both the Fe-rich bands and the Si-rich bands display depleted light REE relative to heavy REE, combined with positive La, Y anomalies, suggesting characteristics of sea water. Meanwhile, hydrothermal fluids are identified as major sources because of the positive Eu anomalies. The absence of negative Ce anomalies indicates relatively anoxic condition in the local water. The Fe-rich bands show total concentration of REE higher than the Si-rich bands, which may be related to the characteristics of silicon and iron sediment, the iron sediment is more likely to absorb REE. The high-grade ore has mixed source of hydrothermal and seawater, which has the same origin with the normal ore. Part of high-grade ore are strongly disturbed by the later hydrothermal fluid, even show the characteristics of hydrothermal fluids. |
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| Keywords: | Sijiaying area Banded iron formation Fe-rich bands Si-rich bands High-grade ore |
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