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This schist consists of porphyroblastic garnet, the core of which is compositionally homogeneous pyrope-almandine (X_\u003cMg\u003e=Mg/(Fe+Mg)\u0026cong;0.50) surrounded by an almandine rim (X_\u003cMg\u003e\u0026cong;0.27), biotite (X_\u003cMg\u003e=0.70-0.73), plagioclase (An_\u003c75-87\u003e), spinel (X_\u003cMg\u003e=0.26-0.36), corundum, rutile and zircon. In addition, individual garnet porphyroblasts enclose different mineral associations in the magnesian cores as follows : (A) sapphirine (X_\u003cMg\u003e=0.75-0.85), commonly with kyanite, and, locally, with spinel (X_\u003cMg\u003e=0.50-0.68), (B) kyanite only, and (C) gedrite (X_\u003cMg\u003e=0.75-0.78)+quartz aggregates. The mineral associations sapphirine+kyanite±spinel and gedrite+quartz±kyanite are inferred to be relict assemblages of the prograde P-T path, and the magnesian garnet cores to have been homogenized during the granulite-facies event. 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RELICT SAPPHIRINE IN PYROPIC GARNET FROM THE EASTERN SØR RONDANE MOUNTAINS, ANTARCTICA
https://doi.org/10.15094/00002765
https://doi.org/10.15094/00002765aa442f9f-61b8-4358-8de2-521bf836f673
名前 / ファイル | ライセンス | アクション |
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KJ00002368395 (89.8 kB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1994-09-01 | |||||
タイトル | ||||||
タイトル | RELICT SAPPHIRINE IN PYROPIC GARNET FROM THE EASTERN SØR RONDANE MOUNTAINS, 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 | 10.15094/00002765 | |||||
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) | |||||
記事種別(英) | ||||||
en | ||||||
ABSTRACT | ||||||
著者名よみ |
アサミ, マサオ
× アサミ, マサオ× マキモト, ヒロシ / |
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著者名(英) |
ASAMI, Masao
× ASAMI, Masao× MAKIMOTO, Hiroshi× GREW, Edward S. |
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著者所属(英) | ||||||
en | ||||||
Department of Geological Sciences, College of Liberal Arts, Okayama, University | ||||||
著者所属(英) | ||||||
en | ||||||
Geological Survey of Japan | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Geological Sciences, University of Maine | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Sapphirine-bearing biotitic schist forms a reaction zone between an ultramafic lens and its host biotite-hornblende gneiss at Balchenfjella, which is underlain by migmatitic complex metamorphosed under granulite-facies conditions in the Late Proterozoic and under amphibolite-facies conditions in the Early Paleozoic. This schist consists of porphyroblastic garnet, the core of which is compositionally homogeneous pyrope-almandine (X_<Mg>=Mg/(Fe+Mg)≅0.50) surrounded by an almandine rim (X_<Mg>≅0.27), biotite (X_<Mg>=0.70-0.73), plagioclase (An_<75-87>), spinel (X_<Mg>=0.26-0.36), corundum, rutile and zircon. In addition, individual garnet porphyroblasts enclose different mineral associations in the magnesian cores as follows : (A) sapphirine (X_<Mg>=0.75-0.85), commonly with kyanite, and, locally, with spinel (X_<Mg>=0.50-0.68), (B) kyanite only, and (C) gedrite (X_<Mg>=0.75-0.78)+quartz aggregates. The mineral associations sapphirine+kyanite±spinel and gedrite+quartz±kyanite are inferred to be relict assemblages of the prograde P-T path, and the magnesian garnet cores to have been homogenized during the granulite-facies event. Differences in the associations are presumed to have resulted from pre-metamorphic chemical heterogeneity in the precursor to the biotitic schist. These mineral associations suggest a clockwise prograde P-T trajectory entirely within the kyanite field; the assemblage sapphirine+kyanite might have been stable as T approached 700℃ constraining P to be at least 8 kbar. Further increase in temperature was accompanied by a small decrease in P to the 7-8 kbar (at T=760-800℃) estimated for peak conditions in the granulite-facies by M. ASAMI et al. (Proc. NIPR Symp. Antarct. Geosci., 6,57,1993). The relict sapphirine-kyanite assemblages in the Sør Rondane Mountains are similar to those reported from the Luzow-Holm Bay complex, Antarctica, and the Highland Complex, Sri Lanka (e.g. Y. OGO et al. : Recent Progress in Antarctic Earth Science, ed. by Y. Yoshida et al. Tokyo, Terra Sci. Publ., 75,1992), suggesting similarities in the P-T evolution of the three areas. | |||||
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 7, p. 179, 発行日 1994-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |