铁氧化物型铜金矿中磁铁矿微量元素含量对结构参数影响的初步研究  

The primary study on the variations of trace element concentrations of magnetite to the effection of the cell parameters

作　　者：邓会娟[1] 夏浩东[1] 张德贤[2,3] 

机构地区：[1]国土资源实物地质资料中心,河北三河065201 [2]中南大学资源与安全工程学院,长沙410083 [3]教育部有色金属与成矿预测重点实验室,中南大学地球科学与信息物理学院,长沙410083

出　　处：《地质找矿论丛》2013年第4期524-528,共5页Contributions to Geology and Mineral Resources Research

基　　金：中国地质调查局项目"国家级岩心标本采集及数字化"(项目编号:1212011120404);新疆中亚造山带大陆动力学与成矿预测实验室开放课题(项目编号:XJDX1102-2011-05)共同资助

摘　　要：磁铁矿是一种重要的铁氧化物,广泛分布于自然界的三大类岩石和各种不同类型的矿床中。采用激光剥蚀电感耦合等离子质谱仪,分析了澳大利亚Ernest Henry铁氧化物型铜金矿床中磁铁矿的微量元素含量,并用X衍射测定微量元素含量最高和最低时磁铁矿相应的晶胞参数,从而评价微量元素变化对磁铁矿结构参数的影响。结果表明,磁铁矿中存在着阳离子替代关系;微量元素含量高的磁铁矿晶胞参数a0值小于标准磁铁矿的a0值,含微量元素低的磁铁矿晶胞参数a0值则大于标准磁铁矿的a0值;磁铁矿中所含微量元素不同,其对应的晶胞参数a0值亦有明显变化。Magnetite, one of the most important iron oxides, pervasively occurred among the igneous, sedimentary and metamorphosed rocks, and also presented in most of various deposits. Magnetite from Ernest Henry iron oxides copper and gold deposit with highest and lowest trace element concentration were inverstigated using laser ablation inductively coupled plasma mass spectrometry in this study. The cell parameters of correspondent magnetite were measured using X ray diffraction. We attempt to evaluate the variations of trace element concentrations of magnetite to the effection of the cell parameters. The re- sults showed that （1） substitution of a large range of cations can be induced because tetrahedral as well as octahedral positions are available in magnetite; （2） the trace element concentrations have an obvirous im- pact on changes of cell parameters in magnetite, and the magnetite with highest trace element concentra- tion has a smaller cell parameters compared to standard magnetite while the magnetite with lowest trace element concentration has a bigger cell parameters compared to standard magnetite, however, it is still unclear for the quality relationship between trace element concentrations and cell parameters.

关 键 词：激光剥蚀电感耦合等离子体质谱 磁铁矿 微量元素 X衍射 晶胞参数 

分 类 号：P578.46[天文地球—矿物学]