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The intergrowth occupies small domains in microcline pegmatite dykes, which yield metamict cerianite and obliquely cut the basement gneisses and hornblende pegmatite. In the domains, reddish garnet and smoky quartz are in an interfingering relationship with the width of several millimeters. Fe-Ti oxides, K-feldspar and biotite are absent in the domains. Garnet shows a weakly-zoned structure with a rather Ca-rich core, namely, the rim attached to quartz and plagioclase has the composition of Gros_\u003c14.1\u003eAlm_\u003c72.4\u003ePyr_\u003c6.0\u003eSpes_\u003c7.2\u003e and the core Gros_\u003c16.1\u003eAlm_\u003c71.2\u003ePyr_\u003c5.5\u003eSpes_\u003c7.2\u003e. The low pyrope content is in contrast to the higher value in garnet from gneisses around Syowa Station, ranging from 18 to 46. Plagioclase occurs as an irregularly-shaped crystal in a narrow area along the rim of garnet. It is also zoned with a rather Ca-poor core (An=22.3) fringed by the rim (An=23.6-23.8). Or content is lower than 2.8 in both core and rim. Judged from the texture, chemical composition and mineral species associated, it is inferred that the intergrowth has not formed through the interaction of quartzo-feldspathic magma with garnet in surrounding gneisses but directly crystallized from the magma. 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PEGMATITE FROM NESOYA ISLAND, LUTZOW-HOLM BAY, EAST ANTARCTICA : WITH SPECIAL REFERENCE TO GARNET-QUARTZ SYMPLEKTITE
https://doi.org/10.15094/00002604
https://doi.org/10.15094/000026049eba3ef6-e9c5-4845-821a-431796d7b7bf
名前 / ファイル | ライセンス | アクション |
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KJ00002368194 (86.9 kB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1989-09-01 | |||||
タイトル | ||||||
タイトル | PEGMATITE FROM NESOYA ISLAND, LUTZOW-HOLM BAY, EAST ANTARCTICA : WITH SPECIAL REFERENCE TO GARNET-QUARTZ SYMPLEKTITE | |||||
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 | 10.15094/00002604 | |||||
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 | ||||||
論文名よみ | ||||||
その他のタイトル | PEGMATITE FROM NESOYA ISLAND, LUTZOW-HOLM BAY, EAST ANTARCTICA : WITH SPECIAL REFERENCE TO GARNET-QUARTZ SYMPLEKTITE | |||||
著者名よみ |
スズキ, モリヒサ
× スズキ, モリヒサ× マツモト, ユキオ |
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著者名(英) |
SUZUKI, Morihisa
× SUZUKI, Morihisa× MATSUMOTO, Yukio |
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著者所属(英) | ||||||
en | ||||||
Department of Geology, Faculty of School Education, Hiroshima University | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Mineralogical Sciences and Geology, Faculty of Science, Yamaguchi University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Graphic intergrowth of garnet and quartz occurs in Nesoya Island on the north of Syowa Station, East Antarctica. The intergrowth occupies small domains in microcline pegmatite dykes, which yield metamict cerianite and obliquely cut the basement gneisses and hornblende pegmatite. In the domains, reddish garnet and smoky quartz are in an interfingering relationship with the width of several millimeters. Fe-Ti oxides, K-feldspar and biotite are absent in the domains. Garnet shows a weakly-zoned structure with a rather Ca-rich core, namely, the rim attached to quartz and plagioclase has the composition of Gros_<14.1>Alm_<72.4>Pyr_<6.0>Spes_<7.2> and the core Gros_<16.1>Alm_<71.2>Pyr_<5.5>Spes_<7.2>. The low pyrope content is in contrast to the higher value in garnet from gneisses around Syowa Station, ranging from 18 to 46. Plagioclase occurs as an irregularly-shaped crystal in a narrow area along the rim of garnet. It is also zoned with a rather Ca-poor core (An=22.3) fringed by the rim (An=23.6-23.8). Or content is lower than 2.8 in both core and rim. Judged from the texture, chemical composition and mineral species associated, it is inferred that the intergrowth has not formed through the interaction of quartzo-feldspathic magma with garnet in surrounding gneisses but directly crystallized from the magma. It seems possible that the crystallization has proceeded under rather low fo_2 condition, because the pegmatite contains no Fe-Ti oxides such as magnetite. | |||||
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 3, p. 151, 発行日 1989-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |