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Developments of fluid inclusion analysis by using high-energy ion beam

高能离子束流体包裹体分析研究进展

基本信息

批准号：
14540443
负责人：
KUROSAWA Masanori
金额：
$ 2.43万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540443/
关键词：
proton beam trace element analysis fluid inclusion PIXE X-ray analysis プロントビーム

项目摘要

In this study, quantitative trace element analytical techniques for single fluid inclusions using proton-induced X-ray emission(PIXE) have been developed to investigate an elemental transportation by Earth's fluid. The main subjects were as follows : 1)developments of the quantification and the calculation method of total X-ray emission from a fluid inclusion buried in mineral matrix : 2)evaluation of the developed quantification and the calculation by using PIXE measurements of house-made fluid-inclusion analogue samples with known contents and shape : 3)estimation of the analytical error for trace-element determinations of natural fluid inclusion : 4)trace-element determinations of single fluid inclusions in a hydrothermal quartz vein. The quantification and the calculation were developed on the basis of Campbell (1993)'s method for PIXE determination of trace elements in solids and Ryan et al. (1993)'s method for single fluid inclusion analysis using PIXE. By using the developed met … More hods, elements with concentrations of 10 to 1000 ppm in single fluid inclusion were measured with average estimated relative error of ±7%. For natural fluid inclusions with 30 μm radius and 20 μm depth in quartz, the total analytical errors were estimated to be ±40% relative for Ca,±16% for Fe,±13% for Zn,±12% for Sr,and ±11% for Br and Rb,by considering uncertainties in microscopic measurements of inclusion depths. Detection limits of 4 to 46 ppm for elements of mass numbers 25-50 were achieved for analyses of a spherical fluid inclusion with 30-μm radius and 20-μm depth in quartz at an integrated charge of 1.0 μC. The trace element compositions of single fluid inclusions in hydrothermal quartz veins from Kawakami village, Nagano Prefecture, Central Japan, were also determined by using the developed method. The elemental concentrations in the inclusions varied widely : 0.2-9 wt% for Ca and Fe,300-8000 ppm for Mn and Zn,40-3000 ppm for Cu,100-4000 ppm for Br,Rb,Sr,and Pb,and lessthan 100 ppm for Ge. Less

在这项研究中，发展了单个流体包裹体的质子诱导X射线发射(PIXE)痕量元素定量分析技术，以研究地球流体对元素的迁移。主要内容如下：1)埋藏在矿物基质中的流体包裹体X射线总发射量的定量和计算方法的发展：2)对自制的已知含量和形状的流体包裹体模拟样品的PIXE定量和计算方法的评价：3)天然流体包裹体微量元素测定的分析误差估计：4)热液石英脉中单个流体包裹体的痕量元素测定。定量和计算是在Campbell(1993)S和Ryan等人的PIXE测定固体中痕量元素的基础上发展起来的。(1993)S提出的单流体包裹体PIXE分析方法。使用开发的MET…单个流体包裹体中10~1000ppm的HODS、元素含量较多，平均估计相对误差为±7%。对于半径为30μm、深度为20μm的石英天然流体包裹体，考虑包裹体深度显微测量的不确定度，总分析误差估计为：Ca为±40%，Fe为±16%，Zn为±13%，Sr为±12%，Br和Rb为±11%。对半径为30μm、深度为20μm的球形流体包裹体的检测下限为4~46ppm，积分电荷量为1.0μC。用该方法还测定了日本中部长野县川上村热液石英脉中单个流体包裹体的微量元素组成。包裹体中的元素含量变化很大：Ca和Fe的质量分数为0.2-9wt%，Mn和Zn的含量为300-8000ppm，Cu的含量为40-3000ppm，Br100-4000ppm的含量为100-4000ppm，Ge的含量小于100ppm。较少