Carbonic fluid inclusions in ultrahigh-temperature metamorphic rocks from Tonagh Island in the Archean Napier Complex, East Antarctica: A preliminary report

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概要

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• We report here the occurrence of high density CO_2-rich fluid inclusions in ultrahigh-temperature metamorphic rocks from Tonagh Island of the Archean Napier Complex, East Antarctica. A study on the different lithological units from Tonagh Island (garnet gneiss, sapphirine granulite, garnet-orthopyroxene gneiss, and magnetite-quartz gneiss) shows the common presence of carbonic fluid inclusions entrapped within various minerals. The melting temperatures of fluids in the first three rock types lie in the range of -56.3 to -57.2℃, close to the triple point for pure CO_2 (-56.6℃). Fluid inclusions in magnetite-quartz gneiss show slight depression in their melting temperatures (-56.7〜-57.8℃) suggesting traces of additional fluid species such as CH_4 and/or N_2 in the dominantly CO_2-rich fluid. Homogenization of pure CO_2 inclusions in the garnet gneiss, sapphirine granulite, and garnet-orthopyroxene gneiss occurs into the liquid phase at temperatures in the range of -34.9〜+4.2℃. This translates into high CO2 densities in the range of 0.9-1.1 g・cm^<-3>. The estimated CO_2 isochore intersects the counterclockwise P-T trajectory of Tonagh Island at around 6-9 kbar at 1100℃, which corresponds to the peak metamorphic conditions of Tonagh Island derived from mineral phase equilibria. We therefore infer that CO_2 was the dominant fluid species present during the ultrahigh-temperature metamorphism in Tonagh Island. The stability of anhydrous minerals such as orthopyroxene in the study area might have been effected by the lowering of H_2O-activity due to the presence of CO_2 at peak metamorphic conditions (>1100℃).

• 国立極地研究所の論文

著者

• Hokada Tomokazu

  National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan

• Manoj S.

  Biopharmaceutical Research Suven Life Sciences Ltd.

• Santosh M

  Kochi Univ. Kochi Jpn

• Santosh M.

  Centre For Earth Science Studies

• Santosh M.

  Biopharmaceutical Research Suven Life Sciences Ltd.

• Santosh M.

  Department Of Natural Environmental Science Faculty Of Science Kochi University

• Osanai Yasuhito

  Department of earth sciences, Okayama university

• OWADA Masaaki

  Department of Earth Sciences, Yamaguchi University

• TSUNOGAE Toshiaki

  Institute of Geoscience, University of Tsukuba

• TOYOSHIMA Tsuyoshi

  Graduate school of Science and Technology, Niigata University

• Osanai Yasuhito

  Division Of Evolution Of Earth Environments Faculty Of Social Andcultural Studies Kyushu University

• Osanai Y

  Fukuoka Univ. Education Munakata Jpn

• Osanai Yasuhito

  Department Of Earth And Planetary System Science Okayama University

• Osanai Yasuhito

  Division Of Evolution Of Earth Environments Kyushu University

• Hokada Tomokazu

  National Institute Of Polar Research 10-3 Midori-cho Tachikawa Tokyo 190-8518 Japan

• Crowe Warwick

  Department of Geology and Geophysics, University of Western Australia

• Crowe Warwick

  Department Of Geology And Geophysics University Of Western Australia

• Osanai Yasuhito

  Division Of Evolution Of Earth Environments Faculty Of Social And Cultural Studies Kyushu University

• Tsunogae Toshiaki

  Graduate School Of Science And Technology Niigata University

• Tsunogae Toshiaki

  Institute Of Geoscience The University Of Tsukuba

• Owada Masaaki

  Division Of Earth Sciences Graduate School Of Science And Technology Yamaguchi University

• Owada Masaaki

  Department Of Earth Sciences University Of Yamaguchi

• Satish-kumar M.

  Geological Survey Of India

• Hamamoto T

  Dia Consultants Co. Ltd. Aichi Jpn

• Hamamoto Takuji

  Graduate School Of Science And Technology Niigata University

• Osanai Y

  Division Of Evolution Of Earth Environments Faculty Of Social And Cultural Studies Kyushu University

• Crowe Warwicka.

  Department Of Geology And Geophysics University Of Western Australia

• Santosh M

  Faculty Of Science Kochi University

• Miyano Takashi

  Institute of Geoscience, the University of Tsukuba

• Osanai Y

  Division Of Earth Sciences Faculty Of Social And Cultural Studies Kyushu University

• Owada Masaaki

  Department Of Mineral Science And Geology Faculty Of Science Yamaguchi University

• Osanai Yasuhito

  Division Of Earth Sciences Faculty Of Social And Cultural Studies Kyushu University

• Toyoshima Tsuyoshi

  Graduate School Of Science And Technology Niigata University

• Hokada Tomokazu

  National Inst. Of Polar Res.

• Miyano Takashi

  Institute Of Geoscience University Of Tsukuba

• Tsunogae T

  Univ. Tsukuba Ibraki Jpn

• Miyano Takashi

  Institute Of Geosciece The University Of Tsukuba

• Santosh M.

  Department Of Geosciences Faculty Of Science Osaka City University:centre For Earth Science Studies

• Toyoshima Tsuyoshi

  Graduate School Of Science And Technology Earth Science Niigata University

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