Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
2003-10-01 |
タイトル |
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タイトル |
Fluid inclusions in an osumilite-bearing granulite from Bunt Island in the Archean Napier Complex, East Antarctica: implications for a decompressional P-T path? |
言語 |
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言語 |
eng |
キーワード |
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主題Scheme |
Other |
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主題 |
Carbonic fluid inclusion |
キーワード |
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主題Scheme |
Other |
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主題 |
ultrahigh-temperature granulite |
キーワード |
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主題Scheme |
Other |
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主題 |
Bunt Island |
キーワード |
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主題Scheme |
Other |
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主題 |
Archean Napier Complex |
キーワード |
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主題Scheme |
Other |
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主題 |
East Antarctica |
資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
departmental bulletin paper |
ID登録 |
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ID登録 |
10.15094/00003122 |
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ID登録タイプ |
JaLC |
ページ属性 |
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内容記述タイプ |
Other |
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内容記述 |
P(論文) |
著者名(英) |
Tsunogae, Toshiaki
Santosh, M.
Osanai, Yasuhito
Owada, Masaaki
Toyoshima, Tsuyoshi
Hokada, Tomokazu
Crowe, Warwick A.
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著者所属(英) |
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en |
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Department of Geology, Rand Afrikaans University/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 |
抄録(英) |
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内容記述タイプ |
Other |
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内容記述 |
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. |
雑誌書誌ID |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA1130866X |
書誌情報 |
Polar geoscience
巻 16,
p. 61-75,
発行日 2003-10
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出版者 |
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出版者 |
National Institute of Polar Research |