辽宁弓长岭铁矿二矿区条带状铁建造地球化学特征及成因探讨

doi:10.13278/j.cnki.jjuese.201703105

吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (3): 694-705.doi: 10.13278/j.cnki.jjuese.201703105

辽宁弓长岭铁矿二矿区条带状铁建造地球化学特征及成因探讨

刘大为¹, 王铭晗², 刘素巧³, 胡克¹

1. 中国地质大学(北京)海洋学院, 北京 100083;
2. 中国地质图书馆/中国地质调查局地学文献中心, 北京 100083;
3. 北京地星伟业数码科技有限公司, 北京 100080

收稿日期:2016-09-19 出版日期:2017-05-26 发布日期:2017-05-26
通讯作者: 胡克(1957),男,教授,博士生导师,主要从事变质岩岩石学及地球化学方面的研究,E-mail:huke@cugb.edu.cn E-mail:huke@cugb.edu.cn
作者简介:刘大为(1986-),男,博士研究生,主要从事地球化学研究,E-mail:ldw861111@163.com
基金资助:
全国危机矿山接替资源找矿项目（200521036）

Geochemical Characteristics and Genesis of Band Iron Formation in No.2 Mining Area of Gongchangling Iron Deposit, Liaoning Province

Liu Dawei¹, Wang Minghan², Liu Suqiao³, Hu Ke¹

1. School of Marine Sciences, China University of Geosciences, Beijing 100083, China;
2. National Geological Library of China/Geosciences Documentation Center, CGS, Beijing 100083, China;
3. Beijing Landstar Digital Technology Company Limited, Beijing 100080, China

Received:2016-09-19 Online:2017-05-26 Published:2017-05-26
Supported by:
Supported by National Crisis Mines Replacement Resources Prospecting Project (200521036)

摘要/Abstract

摘要： 本文以弓长岭铁矿二矿区磁铁石英岩、磁铁富矿和蚀变围岩样品为研究对象，进行了主量元素、微量元素、稀土元素和Fe同位素的测试。结果表明：磁铁石英岩主要由TFe₂O₃和SiO₂组成，Al₂O₃和TiO₂质量分数较低，微量元素质量分数和稀土元素质量分数均较低；经澳大利亚后太古界平均页岩（PAAS）标准化的稀土配分模式呈现出轻稀土亏损和重稀土富集，La、Eu和Y的正异常明显，Ce的异常不明显，Y/Ho值较高；富集Fe的重同位素，且与海底喷发热液经过氧化沉淀后的Fe同位素特征一致。磁铁富矿与磁铁石英岩的地球化学特征有很好的一致性和继承性，但磁铁富矿的REE和Eu质量分数较高，且较磁铁石英岩富集Fe的轻同位素，范围更大，与蚀变岩的Fe同位素组成相近。弓长岭铁矿的磁铁石英岩是陆源物质加入很少的古海洋化学沉积岩，为喷出的海底热液与海水的混合条件下氧化沉淀形成的。磁铁富矿推测为富Fe的轻同位素热液对磁铁石英岩进行改造，经过去硅富铁作用形成的。

关键词: Fe同位素, 稀土元素, 成因探讨, 弓长岭铁矿, 地球化学

Abstract: In this paper, major elements, trace elements and Fe isotope composition of the magnetite quartzite, magnetite-rich ore and altered rock are presented. The average bulk compositions of the magnetite quartzite are characterized by high total Fe₂O₃ and SiO₂, and low contents of Al₂O₃ and TiO₂. The overall contents of trace elements and ΣREE in magnetite quartzite are very low. In the Post Archean Australian shale(PAAS) normalized REE patterns, samples display LREE depletion, distinct positive anomalies of La, Eu, Y, unobvious Ce anomalies, high Y/Ho values and heavy Fe isotope enrichment(relative to IRMM-014), which consists with the Fe isotope of oxidized and precipitated hydrothermal fluid. The geochemical charateristics of magnetite-rich ores are similar with those of the magnetite quartzite. However, ΣREE and Eu contents in the magnetite-rich ore are higher. Compared with magnetite quarterite, the magnetite-rich ore is characterized by the enrichment of light Fe isotope with larger range, which is similar to the altered rock. The magnetite quartzite is paleo-ocean chemical sedimentary rocks with devoid of terrestrial sediments, and experienced the oxidation and precipitation induced by the mixing of the submarine hydrothermal solution and the seawater. It can be deduced that the high grade iron ore was formed by the reworking of the low grade iron ore by the hydrothermal system with light Fe isotope enrichment, which resulted in Fe enrichment and Si depletion.

Key words: Fe isotope, rare earth element, genesis, Gongchanglingiron deposit, geochemistry

中图分类号:

P618.31

刘大为, 王铭晗, 刘素巧, 胡克. 辽宁弓长岭铁矿二矿区条带状铁建造地球化学特征及成因探讨[J]. 吉林大学学报(地球科学版), 2017, 47(3): 694-705.

Liu Dawei, Wang Minghan, Liu Suqiao, Hu Ke. Geochemical Characteristics and Genesis of Band Iron Formation in No.2 Mining Area of Gongchangling Iron Deposit, Liaoning Province[J]. Journal of Jilin University(Earth Science Edition), 2017, 47(3): 694-705.

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辽宁弓长岭铁矿二矿区条带状铁建造地球化学特征及成因探讨

Geochemical Characteristics and Genesis of Band Iron Formation in No.2 Mining Area of Gongchangling Iron Deposit, Liaoning Province

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