| Project/Area Number |
09554027
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | UNIVERSITY OF TSUKUBA |
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Principal Investigator |
KATO Takumi Institute of Geoscience, UNIVERSITY OF TSUKUBA Associate Professor, 地球科学系, 助教授 (90214379)
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| Co-Investigator(Kenkyū-buntansha) |
KUROSAWA Masanori Institute of Geoscience, UNIVERSITY OF TSUKUBA Lecturer, 地球科学系, 講師 (50272141)
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| Project Period (FY) |
1997 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥8,600,000 (Direct Cost: ¥8,600,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1999: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1998: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1997: ¥5,200,000 (Direct Cost: ¥5,200,000)
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| Keywords | 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 |
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| Research Abstract |
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.
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