Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
2000-10-01 |
タイトル |
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タイトル |
Fluorine-rich calcic amphiboles in ultrahigh-temperature mafic granulite from Tonagh Island in the Napier Complex, East Antarctica: Preliminary report |
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 |
fluorine-rich amphibole |
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 |
mafic granulite |
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 |
Tonagh Island |
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 |
Archean 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 |
10.15094/00003068 |
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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
Osanai, Yasuhito
Toyoshima, Tsuyoshi
Owada, Masaaki
Hokada, Tomokazu
Crowe, Warwick A.
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著者所属(英) |
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en |
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Faculty of Education, Shimane University/Department of Earth Sciences, Okayama University/Graduate School of Science and Technology, Niigata University/Department of Earth Sciences, Yamaguchi 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 |
Fluorine-rich calcic amphiboles occur in ultrahigh-temperature mafic granulite from Tonagh Island in the Napier Complex, East Antarctica The amphiboles are subdivided into two types high-grade brownish to pale brownish amphibole and retrograde greenish amphibole The brownish amphibole is pargasitic occurring as a subhedral grain in two-pyroxene mafic granulite It contains up to 2 2 wt% fluorine, which corresponds to an F/(F + Cl + OH) ratio of 0 54 (sample B98020801) In sample B98020802B, brownish amphibole is rimmed by an orthopyroxene-plagioclase-quartz corona, probably formed by a devolatilization reaction It has a lower fluorine content of 0 21-0 52 wt% (F/(F +Cl + OH) = 004-0 13) Pale brownish amphibole is a minor phase in metapyroxenite It has the highest fluorine content (2 6 wt%, F/(F + C1 + OH) = 0 60, sample B98012802F) Greenish amphibole is present as fine-grained aggregates with quartz, rimming ortho- and clinopyroxenes Fluorine is almost absent in this amphibole Holloway and Ford (1975) experimentally determined that pargasite with a F/(F +Cl + OH) ratio of 0 48 is stable up to 1100℃ at 5 kbar, and that F/(F + C1 + OH) increases with increasing temperature The fluorine-rich calcic amphiboles in mafic granulites are therefore stable under UHT metamorphic conditions The formation of an orthopyroxene-plagioclase-quartz corona in sample B98020802B can therefore be explained by breakdown of the amphibole due to its low-fluorine content The origin of the fluorine is not known, but it is probably derived from basic magma at the stage of protolith formation |
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 13,
p. 103-113,
発行日 2000-10
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出版者 |
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出版者 |
National Institute of Polar Research |