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Carbonic fluid inclusions in ultrahigh-temperature metamorphic rocks from Tonagh Island in the Archean Napier Complex, East Antarctica: A preliminary report
https://doi.org/10.15094/00003083
https://doi.org/10.15094/00003083c759f2d8-ae10-4cce-9145-c90878e320f8
名前 / ファイル | ライセンス | アクション |
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KJ00000044201 (1.5 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 2001-10-01 | |||||
タイトル | ||||||
タイトル | Carbonic fluid inclusions in ultrahigh-temperature metamorphic rocks from Tonagh Island in the Archean Napier Complex, East Antarctica: A preliminary report | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | carbonic fluid inclusion | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | ultrahigh-temperature granulite | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Tonagh Island | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Archean Napier Complex | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | East Antarctica | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00003083 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
著者名(英) |
Tsunogae, Toshiaki
× Tsunogae, Toshiaki× Santosh, M.× Osanai, Yasuhito× Owada, Masaaki× Toyoshima, Tsuyoshi× Hokada, Tomokazu× Crowe, Warwick A.× Miyano, Takashi |
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著者所属(英) | ||||||
en | ||||||
Institute of Geoscience, the University of Tsukuba/Department of Natural Environmental Science, Kochi University/Department of Earth Sciences, Okayama University/Department of Earth Sciences, Yamaguchi University/Graduate School of Science and Technology, Niigata University/National Institute of Polar Research/Department of Geology and Geophysics, University of Western Australia/Institute of Geoscience, the University of Tsukuba | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | 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℃). | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA1130866X | |||||
書誌情報 |
Polar geoscience 巻 14, p. 25-38, 発行日 2001-10 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |