Fluid inclusions in an osumilite-bearing granulite from Bunt Island in the Archean Napier Complex, East Antarctica: implications for a decompressional P-T path?
スポンサーリンク
概要
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We report high-density CO_2-rich fluid inclusions in garnet,orthopyroxene,and quartz from an osumilite-bearing aluminous granulite from Bunt Island of the Archean Napier Complex,East Antarctica.The melting temperatures of fluids lie in the range of -56.8 to -57.8゜C being close to the triple point for pure CO_2 (-56.6゜C ). Homogenization of the CO_2,-rich fluids into the liquid phase occurs at temperatures in the range of -35.4 to 24.7゜C. This translates into CO_2 densities in the range of 0.788-1.084g/cm^3 .The estimated CO_2 ,isochore for high-density inclusions in garnet intersects the P-T trajectory of Bunt Island at around 10 kbar at 1050゜C, which corresponds to the peak metamorphic conditions of the region derived from mineral phase equilibria.We therefore infer that CO_2 ,was the dominant fluid species present during the ultrahigh-temperature metamorphism in Bunt Island.CO_2 inclusions with lower density occurring in quartz and garnet provide isochores that intersect the P-T path at <7 kbar and <950゜C indicating density reversal of originally high-density inclusions along a decompressional exhumation path of the ultrahigh-temperature rocks in the Bunt Island.
- 国立極地研究所の論文
著者
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Hokada Tomokazu
National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan
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Manoj S.
Biopharmaceutical Research Suven Life Sciences Ltd.
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Santosh M
Kochi Univ. Kochi Jpn
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Santosh M.
Centre For Earth Science Studies
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Santosh M.
Biopharmaceutical Research Suven Life Sciences Ltd.
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Santosh M.
Department Of Natural Environmental Science Faculty Of Science Kochi University
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Osanai Yasuhito
Department of earth sciences, Okayama university
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OWADA Masaaki
Department of Earth Sciences, Yamaguchi University
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TOYOSHIMA Tsuyoshi
Graduate school of Science and Technology, Niigata University
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TSUNOGAE Toshiaki
Department of Earth Sciences, University of Tsukuba
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Osanai Yasuhito
Division Of Evolution Of Earth Environments Faculty Of Social Andcultural Studies Kyushu University
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Osanai Y
Fukuoka Univ. Education Munakata Jpn
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Osanai Yasuhito
Department Of Earth And Planetary System Science Okayama University
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Osanai Yasuhito
Division Of Evolution Of Earth Environments Kyushu University
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Hokada Tomokazu
National Institute Of Polar Research 10-3 Midori-cho Tachikawa Tokyo 190-8518 Japan
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Crowe Warwick
Department of Geology and Geophysics, University of Western Australia
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Crowe Warwick
Department Of Geology And Geophysics University Of Western Australia
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Osanai Yasuhito
Division Of Evolution Of Earth Environments Faculty Of Social And Cultural Studies Kyushu University
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Tsunogae Toshiaki
Graduate School Of Science And Technology Niigata University
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Owada Masaaki
Division Of Earth Sciences Graduate School Of Science And Technology Yamaguchi University
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Owada Masaaki
Department Of Earth Sciences University Of Yamaguchi
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Satish-kumar M.
Geological Survey Of India
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Hamamoto T
Dia Consultants Co. Ltd. Aichi Jpn
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Hamamoto Takuji
Graduate School Of Science And Technology Niigata University
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Osanai Y
Division Of Evolution Of Earth Environments Faculty Of Social And Cultural Studies Kyushu University
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Crowe Warwicka.
Department Of Geology And Geophysics University Of Western Australia
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Santosh M
Faculty Of Science Kochi University
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Osanai Y
Division Of Earth Sciences Faculty Of Social And Cultural Studies Kyushu University
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Owada Masaaki
Department Of Mineral Science And Geology Faculty Of Science Yamaguchi University
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Osanai Yasuhito
Division Of Earth Sciences Faculty Of Social And Cultural Studies Kyushu University
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Toyoshima Tsuyoshi
Graduate School Of Science And Technology Niigata University
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Hokada Tomokazu
National Inst. Of Polar Res.
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Tsunogae T
Univ. Tsukuba Ibraki Jpn
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Tsunogae Toshiaki
Department Of Earth Evolution Sciences Graduate School Of Life And Environmental Sciences University
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Santosh M.
Department Of Geosciences Faculty Of Science Osaka City University:centre For Earth Science Studies
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Toyoshima Tsuyoshi
Graduate School Of Science And Technology Earth Science Niigata University
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