| 江西金山含金黄铁矿的稀土元素赋存状态研究 |
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| 引用本文： | 毛光周,华仁民,高剑峰,龙光明,陆慧娟,李伟强,赵葵东.江西金山含金黄铁矿的稀土元素赋存状态研究[J].矿物学报,2006,26(4):409-418. |
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| 作者姓名： | 毛光周 华仁民 高剑峰 龙光明 陆慧娟 李伟强 赵葵东 |
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| 作者单位： | 成矿作用研究国家重点实验室,南京大学,地球科学系,江苏,南京,210093 |
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| 基金项目： | 国家自然科学基金（批准号：40373025） 致谢：野外工作中得到了江西有色四队、金山金矿、花桥金矿等单位地质人员的大力支持,实验过程中得到了南京大学成矿作用研究国家重点实验室林雨萍老师和濮巍老师的大力帮助.成文过程中得到了南京大学地球科学系姚春亮博士的有益帮助.在此一并表示诚挚的感谢. |
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| 摘 要： | 稀土元素在地质领域得到广泛的应用,查明稀土元素在地质体中的赋存状态,对应用稀土元素解决地学问题非常有意义。本文利用分步溶样ICP-MS测试方法对江西金山金矿含金黄铁矿中稀土元素作了详细的研究,试图弄清黄铁矿中稀土元素的赋存状态。实验表明,金山金矿与金成矿关系密切的黄铁矿的流体包裹体中稀土元素的含量很低;而具有高稀土元素含量的硫化物中的稀土元素主要赋存在硫化物所包含的富Zr微矿物中,如锆石、金红石、尖晶石、钛铁矿等。这些微矿物究竟是以包裹体子晶的形式存在,还是以捕虏晶的形式存在尚有待进一步研究。黄铁矿中包含的硅酸盐相对黄铁矿稀土元素含量及特征的影响很大,直接制约了黄铁矿的稀土元素组成。黄铁矿流体包裹体与黄铁矿矿物的稀土元素组成虽然在含量上有差异,但其配分形式相似,所以黄铁矿的稀土元素组成可以代表黄铁矿中液体包裹体的稀土元素组成,通过分析黄铁矿的稀土元素特征,可以示踪成矿流体的来源与性质,前提是实验中不要将黄铁矿样品全部溶掉,以保证黄铁矿中所包裹的硅酸盐相不参与黄铁矿REE组成的测量。
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| 关 键 词： | 稀土元素 赋存状态 包裹体相 硅酸盐相 黄铁矿 金山金矿 |
| 文章编号： | 1000-4734（2006）04-0409-10 |
| 收稿时间： | 2006-04-30 |
| 修稿时间： | 2006年4月30日 |
EXISTENCE OF REE IN DIFFERENT PHASES OF GOLD-BEARING PYRITE IN THE JINSHAN GOLD DEPOSIT, JIANGXI PROVINCE |
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| MAO Guang-zhou,HUA Ren-min,GAO Jian-feng,LONG Guang-ming,LU Hui-juan,LI Wei-qiang,ZHAO Kui-dong.EXISTENCE OF REE IN DIFFERENT PHASES OF GOLD-BEARING PYRITE IN THE JINSHAN GOLD DEPOSIT, JIANGXI PROVINCE[J].Acta Mineralogica Sinica,2006,26(4):409-418. |
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| Authors: | MAO Guang-zhou HUA Ren-min GAO Jian-feng LONG Guang-ming LU Hui-juan LI Wei-qiang ZHAO Kui-dong |
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| Institution: | State Key Laboratory of Mineral Deposit Research,Department of Earth Sciences,Nanjing University,Nanjing 210093,China |
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| Abstract: | The REE are widely used in various fields of geology.To make it clear the existing forms of the REE in the geological objects is a necessity for us to solve the geological problems by using REE.For example,the existing forms of the REE in sulfides are the basis for sulfide Sm-Nd dating.This paper tries to make it clear the existing forms of the REE in gold-bearing pyrite in the Jinshan gold deposit by the stepwise dissolution test with ICP-MS analysis.Results showed that the contents of REE in liquid-inclusions of gold-bearing pyrite in the Jinshan gold deposit are very low.The higher REE contents of sulfides are recognized mainly in the Zr-rich tiny silicate phase minerals wrapped in sulfides,such as zircon,rutile,spinelle,ilmenite and so on.The silicate phase in pyrite has a remarkable influence on the contents and features of the REE in pyrite and directly restricts the compositions of the REE in the pyrite.Further research is needed to make it clear whether these minerals exist in the forms of daughter-crystals or capture-crystals.The fluid-inclusions of pyrite and the pyrite mineral itself have similar chondrite-normalized REE patterns,although their contents are different.So,the REE composition of pyrite mineral can be considered as the reflection of the composition of pyrite fluid-inclusions.We can trace the sources and characters of the ore-forming fluid by studying the REE of pyrite under the conditions that the pyrite was not completely dissolved. It means that the REE of the silicate phase in pyrite will not be involved in REE analysis. |
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| Keywords: | REE existing form inclusion phase silicate phase pyrite Jinshan gold deposit |
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