2012 Fiscal Year Final Research Report
State analysis of micro area of omphacite inclusions within garnet from eclogite
| Project/Area Number |
22540493
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Science of ore deposit
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| Research Institution | Kagawa University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
OKAMOTO Kazuaki 埼玉大学, 教育学部, 准教授 (60456001)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 変成岩 / エクロジャイト / マイクロ XANES / ラマン |
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| Research Abstract |
We have verified that Raman spectrums are useful as an indicator for the redox state of iron in omphacite included within garnet from eclogites. Eclogites from ultrahigh-pressure metamorphic belts often show symplectitic aggregate or lamellae composed of quartz needles. They are hardly observed in omphacite included within garnet or zircon, those are considered to have avoided the influence of retrograde metamorphism. Another problem in temperature estimation using geothermometer is the determination of Fe3+content in clinopyroxene. Mossbauer spectroscopy and micro-XANES (X-ray absorption near edge structure) in photon factory are effective for the measurement of the Fe3+/Fe2+ratio. In the former, mineral separation is necessary and it takes more than one day to collect spectra from one sample, but in situ analysis at the micron size is possible and it takes less than 2h to collect spectra in the latter except limited facilities.
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[Journal Article] Northward extrusion of the ultrahigh-pressure units in the southern Dabie metamorphic belt2013
Author(s)
Yamamoto, H., Terabayashi, M., Okura, H., Matsui, T., Kaneko, Y., Ishikawa, M. and Maruyama, S.
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Journal Title
east-central China.
Volume: 22(1)
Pages: 51-62
DOI
Peer Reviewed
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[Journal Article] Recycled crustal zircons from podiform chromitites in the Luobusa ophiolite,southern Tibet2013
Author(s)
Yamamoto. S., Komiya, T., Yamamoto, H., Kaneko, Y., Terabayashi, M., Katayama, I., Iizuka, T., Maruyama, S., Yang, J., Kon, Y and Hirata, T.
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Journal Title
Island Arc
Volume: 22(1)
Pages: 89-103
DOI
Peer Reviewed
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[Journal Article] Ion microprobe U-Th-Pb geochronology and study of micro-inclusions in zircon from the Himalayan high- and ultrahigh-pressure eclogites, Kaghan Valley of Pakistan2013
Author(s)
Rehman, H. U., Kobayashi, K., Tsujimori, T., Ota, T., Yamamoto, H., Nakamura, E., Kaneko, Y., Khan, T., Terabayashi, M., Yoshida, K. and Hirajima, T.
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Journal Title
Journal of Asian Earth Sciences
Volume: 63
Pages: 179-196
DOI
Peer Reviewed
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[Journal Article] Depth variation of carbon and oxygen isotopes of calcites in an Archean altered upper oceanic crust: Implication for oxygen isotopes of seawater and CO2 flux from ocean to oceanic crust in the Archean era2012
Author(s)
Shibuya, T., Tahata, M., Kitajima, K., Ueno, Y., Komiya, T., Yamamoto, S., Igisu, M., Terabayashi, M., Sawaki, Y.Takai, K., Yoshida, N. and Maruyama, S.
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Journal Title
Earth and Planetary Science Letters
Volume: 321-322
Pages: 64-73
DOI
Peer Reviewed
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