2010 Fiscal Year Final Research Report
Stable isotope geochemistry of copper, based on the development of isotope analyses of micron-size areas
| Project/Area Number |
20340156
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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 | 一般 |
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| Research Field |
Geochemistry/Astrochemistry
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| Research Institution | The University of Tokyo |
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Principal Investigator |
NOTSU Kenji The University of Tokyo, 大学院・理学系研究科, 名誉教授 (80101103)
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| Co-Investigator(Kenkyū-buntansha) |
HIRATA Takafumi 京都大学, 大学院・理学研究科, 教授 (10251612)
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| Project Period (FY) |
2008 – 2010
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| Keywords | プラズマイオン源質量分析 / 銅同位体組成 / 微小領域同位体分析 / 高精度同位体分析 / フェムト秒レーザー / 液中レーザーアブレーション法 / 銅鉱物 / 安定同位体地球化学 |
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| Research Abstract |
Precise determinations of ^<65>Cu/^<63>Cu have been performed using a multi-collector type mass spectrometer with plasma ion source since 1990's, showing that theδ^<65>Cu values in various natural samples vary from -16.3 to +10.0‰ relative to NIST-SRM976 standard sample. The ratios of minute mineral grains or fine particles have not been measured because of analytical difficulty. In this work, Cu isotope analyses with higher precision and with higher space resolution were realized by shortening the wavelength of the conventional Ti:S femto-second laser. The remodeling of the optical system enables more accurate laser ablation to the minute mineral targets. Furthermore, The laser ablation in solutions was applied to analyze super-fine particles with less than 10 μm. Copper isotope data of various natural samples were obtained using above-mentioned novel apparatus and analytical methods to construct stable isotope geochemistry of copper.
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[Journal Article] The tungsten isotopic composition of Eoarchean rocks : Implications for early silicate differentiation and core-mantle interaction on Earth2010
Author(s)
Iizuka, T.Nakai, S., Sahoo, Y.V., Takamasa, A., Hirata, T., Maruyama, S.
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Journal Title
Earth Planet.Sci.Lett. 291
Pages: 189-200
Peer Reviewed
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[Journal Article] Grain-scale Iron isotopic distribution of pyrite from Precambrian shallow marine carbonate revealed by femtosecond laser ablation multi-collector ICP-MS technique : Potential proxy for the redox state of ancient seawater2010
Author(s)
Nishizawa, M, Yamamoto, H., Ueno, Y., Tsuruoka, S., Shibuya, T., Sawaki, Y., Yamamoto, S., Kon, Y., Kitajima, K., Komiya T., Maruyama, S., Hirata, T.
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Journal Title
Geochim.Cosmochim.Acta 74
Pages: 2760-2778
Peer Reviewed
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[Journal Article] Reworking of HADEAN crust in the Acasta gneisses, 1 northwestern Canada: Evidence from in-situ Lu-Hf isotope analysis of zircon2009
Author(s)
Iizuka, T., Komiya, T., Johnson, S.P., Kon, Y., Maruyama, S., Hirata,T.
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Journal Title
Chem.Geol. 259
Pages: 230-239
Peer Reviewed
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[Journal Article] Isotopic analysis of calcium in blood plasma and bone from mouse samples by multiple collector-ICP-mass spectrometry2008
Author(s)
Hirata, T., Tanoshima, M., Suga, A., Tanaka, Y., Nagata, Y., Shinohara, A, Chiba, M.
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Journal Title
Anal.Sci. 24
Pages: 1501-1507
Peer Reviewed
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[Presentation] In-situ Isotopic Analysis of Fe and C in Geochemical Samples using NIR Femtosecond Laser Ablation-MC-ICP-Mass Spectrometry2008
Author(s)
Hirata T., Ikehata, K., Notsu, K., Yamamoto, H., Nishizawa, N., Ueno, Y.
Organizer
9^<th> European Workshop on Laser Ablation
Place of Presentation
プラハinvited
Year and Date
2008-07-08
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