Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
2001-10-01 |
タイトル |
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タイトル |
High-grade metamorphic rocks from Christmas Point in the Napier Complex, East Antarctica |
言語 |
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言語 |
eng |
キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
UHT metamorphic rocks |
キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
UHT metamorphism |
キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Christmas Point |
キーワード |
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言語 |
en |
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主題Scheme |
Other |
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主題 |
Napier Complex |
キーワード |
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言語 |
en |
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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 |
10.15094/00003085 |
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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) |
Yoshimura, Yasutaka
Miyamoto, Tomoharu
Grew, Edward S.
Carson, Christopher J.
Dunkley, Daniel J.
Motoyoshi, Yoichi
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著者所属(英) |
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en |
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Department of Natural Environmental Science, Kochi University/Department of Earth and Planetary Science, Kyushu University/Department of Geological Science, University of Maine/Department of Geology and Geophysics, Kline Geology Laboratory, Yale University/School of Geosciences, Edgeworth David Building, University of Sydney/National Institute of Polar Research |
抄録(英) |
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内容記述タイプ |
Other |
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内容記述 |
The Christmas Point area is dominated by well-layered gneisses, of which garnet-orthopyroxene gneiss and garnet felsic gneiss are the most abundant types. Orthopyroxene-bearing quartz-rich granulite, layering of which is indistinct to massive, is present as layers within the garnet felsic gneiss. Garnet-amphibole gneiss is present as layers in both the garnet-orthopyroxene gneiss and the garnet felsic gneiss. Orthopyroxene-bearing quartz-rich granulites contain coexisting orthopyroxene, sillimanite and quartz. The occurrence of sapphirine as inclusions in sillimanite implies that metamorphic conditions changed from the stability field of sapphirine+quartz to that of orthopyroxene+sillimanite+quartz. P-T conditions estimated using garnet-orthopyroxene geothermobarometry range from 920 to 1040℃ and 8.8 to 11.5 kbar. Garnet exsolution lamellae present in orthopyroxene from the garnet-orthopyroxene gneiss suggest that a precursor aluminous orthopyroxene was present during the ultrahigh-temperature stage. For the retrograde event, although chemical zoning of major element composition of garnet developed during cooling and reflects high-temperature diffusion, compositional zoning of more slowly diffusing elements, such as Ca, show a complicated pattern caused by partial resorbtion and overgrowth. Garnet rims in all rock types are intergrown with quartz and have relatively high grossular composition. Plagioclase in the garnet-orthopyroxene gneiss and garnet felsic gneiss show reverse zoning. Garnet-amphibole gneiss contains two amphiboles (gedrite and cummingtonite) with different fluorine contents; gedrite occurs as finely crystalline overgrowths surrounding cummingtonite, implying that the retrograde process after peak (ultrahigh-temperature) metamorphism was not simple cooling. |
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 14,
p. 53-74,
発行日 2001-10
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出版者 |
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出版者 |
National Institute of Polar Research |