Developments of non-destructive quantification for trace elements in high-pressure run-products by proton beam

质子束无损定量高压运行产品中微量元素的进展

• 批准号: 09554027
• 负责人: KATO Takumi
• 金额: $ 5.5万
• 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 (B).
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-09554027/
• 关键词: Trace element analysis; Microbeam analysis; PIXE; Proton beam; Fluid inclusion; Pegmatite; X-ray analysis; High pressure experiment; プロトンマイクロプローブ; 非破壊分析; 微量元素; PiXE; Pixe; プロトンマイクロプ-ブ

This project aims to study and develop non-destructive quantitative analytical method of trace elements in high-pressure run-products by PIXE (proton-induced X-ray emission) method. We have developed : 1) a micro-proton beam line for high-pressure product analyses and sample chamber for microanalyses equipped with microscope, micro-driving stage, and two solid state detectors for light and heavy element analyses ; 2) analytical procedures for high-pressure run-products ; 3) quantification of trace elements in single fluid inclusions buried in mineral matrix. A 4 MeV proton micro-beam of 2 nA, 50 μm in size was obtained in the developed beam line by a new quadropole magnet. By using PIXE at the new beam line, high-pressure run-product, graphite-diamond mixtures and basaltic glasses maintained at 2000 C and 7.7 GPa, was analyzed. The graphite contained almost the elements derived from basaltic glass as interlayer impurities, indicating concentration of many elements in graphite under the high-pressure condition. Natural diamonds include usually graphite, so that analyses of the graphite can provide a chemical information of diamond-growth. In addition, trace elements ranged from 10 to 1000 μg/g in single fluid inclusions were determined with ±15 % relative precision by using the developed quantification. At the present measurements, a few μg/g elements were detected in the fluid inclusion with 200 μm in diameter, corresponding to several-picograms (〜10^<-12> g) detection of elements in inclusions.

本课题旨在研究和发展质子诱导x射线发射法对高压运行产品中微量元素的无损定量分析方法。我们开发了：1)用于高压产品分析的微质子束线和用于微量分析的样品室，配有显微镜、微驱动台和两个用于轻元素和重元素分析的固体探测器；2)高压运行产品分析程序；3)埋藏在矿物基质中的单个流体包裹体中微量元素的定量分析。用新型四极磁体在研制的束流线上获得了直径为50 μm、2na的4 MeV质子微束。利用新束流线上的PIXE，分析了在2000℃和7.7 GPa下的高压运行产物、石墨-金刚石混合物和玄武岩玻璃。石墨中几乎含有玄武岩玻璃中的元素作为层间杂质，说明高压条件下石墨中元素浓度较高。天然钻石通常含有石墨，因此对石墨的分析可以提供钻石生长的化学信息。建立的定量方法可测定单个流体包裹体中10 ~ 1000 μg/g的微量元素，相对精度为±15%。在目前的测量中，在直径为200 μm的流体包裹体中检测到几个μg/g的元素，对应于包裹体中元素的几皮克（~ 10^<-12> g）检测。

项目成果

M.Kurosawa et al.: "Quantitative trace element analyses of silicate reterence materials and a stainless steel using the proton microprobe"Chemical Geology. 160. 241-250 (1999)

M.Kurosawa 等人：“使用质子微探针对硅酸盐保留材料和不锈钢进行定量痕量元素分析”化学地质学。

T.KATO and N.NAKATA: "MELTING RELATION OF Mg_2SiO_4-Mg_3Al_2Si_3O_R" Phys.Earth Planet.Inter.(1998)

T.KATO 和 N.NAKATA：“Mg_2SiO_4-Mg_3Al_2Si_3O_R 的熔化关系”Phys.Earth Planet.Inter.(1998)

T.Kato, N.Nakata, E.Ohtani, and K.Onuma: "Melting experiments on the forsterite-pyrope system at 8 and 13.5 GPa"Physics of the Earth and Planetary Interiors. 107. 97-102 (1998)

T.Kato、N.Nakata、E.Ohtani 和 K.Onuma：“镁橄榄石-镁铝榴石系统在 8 和 13.5 GPa 下的熔化实验”地球和行星内部物理学。

T.Kubo, E.Ohtani, T.Kato, T.Shinmei, and K.Fujino: "Effect of water on the α-β transformation kinetics in San Carlos Olivine"Science. 281. 85-87 (1998)

T.Kubo、E.Ohtani、T.Kato、T.Shinmei 和 K.Fujino：“水对圣卡洛斯橄榄石中 α-β 转化动力学的影响”《科学》281. 85-87 (1998)。

M.Kurosawa,S.Shimano,T.Namajima,T.Kato: "Development of quantitative analysis of individual fluid inclusions using proton-induced X-ray emission"Ann Report Tandem Accelerator Center Univ. Tsukuba. 68. 94-99 (2000)

M.Kurosawa、S.Shimano、T.Namajima、T.Kato：“利用质子诱导 X 射线发射对单个流体包裹体进行定量分析的发展”Ann Report Tandem 加速器中心大学。