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High-grade metamorphic rocks from Christmas Point in the Napier Complex, East Antarctica
https://doi.org/10.15094/00003085
https://doi.org/10.15094/0000308526ef441d-504a-429c-b8cd-1b9f77f25e72
名前 / ファイル | ライセンス | アクション |
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KJ00000044203 (2.9 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 | High-grade metamorphic rocks from Christmas Point in the Napier Complex, East Antarctica | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | UHT metamorphic rocks | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | UHT metamorphism | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Christmas Point | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | 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 | 10.15094/00003085 | |||||
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) |
Yoshimura, Yasutaka
× Yoshimura, Yasutaka× Miyamoto, Tomoharu× Grew, Edward S.× Carson, Christopher J.× Dunkley, Daniel J.× Motoyoshi, Yoichi |
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著者所属(英) | ||||||
en | ||||||
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) | ||||||
内容記述タイプ | Other | |||||
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 | ||||||
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. 53-74, 発行日 2001-10 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |