辽宁弓长岭铁矿床磁铁矿稀土元素特征及其地质意义
Characteristics of Rare Earth Elements and the Geological Significance of Magnetite from Gongchangling Iron Deposit in Liaoning Province
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摘要: 辽宁弓长岭铁矿床是我国著名的沉积变质型铁矿床,其二矿区的磁铁富矿达大型规模,属国内之最。为探讨弓长岭铁矿床铁矿的物质来源、形成环境和富矿成因,本文以二矿区六个铁矿体的贫铁矿石和富铁矿石中磁铁矿单矿物为研究对象,利用电感耦合等离子体质谱进行了系统的稀土元素测试。结果表明,所有样品中磁铁矿的稀土元素总量(∑REEs)和Y具有非常一致的特征:稀土元素总量较低,Y/Ho比值较高; 经太古界后平均澳大利亚页岩(PAAS)标准化呈现重稀土相对富集、轻稀土相对亏损的分馏模式,大部分呈现La正异常,所有样品都有明显的Eu和Y正异常,这些特征表明研究区的磁铁矿成矿物质主要来源于海底高温热液和海水; 虽然磁铁矿的Ce/Ce*为0.69~0.97,但大多数样品缺乏真正意义的Ce负异常,这暗示其沉积于还原的海水环境; 富铁矿石磁铁矿的稀土元素总量和Eu含量明显高于贫铁矿石的磁铁矿,而且含富矿的上含铁带Eu异常明显较高,表明富铁矿石磁铁矿具有更明显的热液特征,是在贫铁矿石的基础上受热液活动形成的。
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关键词:
- 磁铁矿 /
- 稀土元素 /
- 电感耦合等离子体质谱法 /
- 沉积变质型铁矿 /
- 弓长岭
Abstract: The Gongchangling iron deposit is a famous diagenetic-metamorphic iron deposit in Liaoning Province. The No.2 mining area contains the largest amounts of high grade magnetite iron ore in China. In order to study the ore material source, metallogenic environment and origin of mineralization, rare earth elements (REEs) and Y of magnetites from the low grade iron ore and the high grade iron ore hosted in six ore bodies were analyzed by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). The results show very similar characteristics of total contents of REEs and Y for both low grade and high grade iron ores. The total contents of REEs were very low, and Y/Ho ratios were high. After being normalized by Post Archean Australian Shale (PAAS), REEs and Y patterns displayed depletion of light REEs relative to high REEs. Most samples had positive La anomalies. All samples have distinct positive anomalies of Eu and Y. All the evidence suggests that Magnetite was derived from submarine high temperature hydrothermal fluids and sea water in the studied area. The lack of clear negative Ce anomalies in all samples indicates that magnetite was formed in an anoxic ocean, although the Ce/Ce* ratios were 0.69-0.97. The high grade iron ore has higher concentrations of total REEs and Eu than the low grade iron ore. The upper iron ore body, which hosted high grade iron ore, also had higher anomalies of Eu, which indicates more outstanding characteristic of hydrothermal fluid. It is suggested that the high grade iron ore was formed by hydrothermal activities from low grade iron ore.-
Keywords:
- magnetite /
- rare /
- earth /
- elements /
- Inductively
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