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METAMORPHIC CONDITIONS OF ULTRAMAFIC LENSES FROM THE EASTERN SØR RONDANE MOUNTAINS, EAST ANTARCTICA
https://doi.org/10.15094/00002617
https://doi.org/10.15094/00002617b98862d3-1e0b-463c-b364-6e1ebd456c30
名前 / ファイル | ライセンス | アクション |
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KJ00002368229 (2.7 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1990-09-01 | |||||
タイトル | ||||||
タイトル | METAMORPHIC CONDITIONS OF ULTRAMAFIC LENSES FROM THE EASTERN SØR RONDANE MOUNTAINS, EAST ANTARCTICA | |||||
言語 | ||||||
言語 | eng | |||||
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 | 10.15094/00002617 | |||||
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) |
MAKIMOTO, Hiroshi
× MAKIMOTO, Hiroshi× ASAMI, Masao× GREW, Edward S. |
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著者所属(英) | ||||||
en | ||||||
Geological Survey of Japan | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Geological Sciences, College of Liberal Arts, Okayama University | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Geological Sciences, Univeristy of Maine | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Lenses up to 5m in size of ultramafic rocks occur in quartzo-feld-spathic, locally migmatized, gneisses at four localities of the eastern Sør Rondane Mountains. A composite lens at one locality consists of harzburgite, orthopyroxenite and garnet amphibolite, and a second, consists entirely of harzburgite. Harzburgite contains chromite-poor spinel (Cr/(Cr+Al)~0.1), which indicates that it was equilibrated under conditions of the spinel lherzolite facies. Temperature estimates for the ultramafic lenses represent that they preserved at least two stages of metamorphic temperature conditions. The higher temperatures (~750℃) estimated by the maximum Al-content of orthopyroxene and the pyroxene geothermometers are consistent with those of the early granulite-facies metamorphic event reported in the eastern Sør Rondane Mountains. This indicates that the ultramafic lenses and the surrounding metamorphic rocks recrystallized under the same granulite-facies metamorphic temperature conditions. The lower temperatures (520-670℃) obtained from garnet rim-biotite pairs probably correspond to the later, discrete amphibolite-facies event in the Mountains. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA1072335X | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Geosciences 巻 4, p. 9-21, 発行日 1990-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |