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Southwestward progressive metamorphism of the calc-silicate rocks is clarified which is in good agreement with the results of previous studies on the pelitic and basic-intermediate rocks. Two isograds are mapped on the basis of the continuous reaction epidote+quartz±calcite=grandite garnet+plagioclase+Fe-oxides±scapolite+H_2O and the discontinuous reaction grossular+quartz=wollastonite+anorthite in the amphibolite-facies and granulite-facies terrains, respectively. The latter is the best-defined isograd among those so far drawn in various rock types of the Lutzow-Holm Complex, as it is based on a vapor-absent reaction and the effects of additional components such as Fe_2O_3 and Na_2O on the reaction are estimated to have been negligible in the studied rocks. Pressure of about 7kb is evaluated by the discontinuous reaction at T=810±20℃ in the granulite-facies terrain. 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PROGRESSIVE METAMORPHISM OF CALC-SILICATE ROCKS FROM THE PRINCE OLAV AND SOYA COASTS, EAST ANTARCTICA
https://doi.org/10.15094/00002534
https://doi.org/10.15094/00002534fee92b2f-e768-4de6-b4c5-8ed95f5d101f
名前 / ファイル | ライセンス | アクション |
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KJ00002368071 (3.4 MB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1987-09-01 | |||||
タイトル | ||||||
タイトル | PROGRESSIVE METAMORPHISM OF CALC-SILICATE ROCKS FROM THE PRINCE OLAV AND SOYA COASTS, 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 | 10.15094/00002534 | |||||
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) | |||||
論文名よみ | ||||||
その他のタイトル | PROGRESSIVE METAMORPHISM OF CALC-SILICATE ROCKS FROM THE PRINCE OLAV AND SOYA COASTS, EAST ANTARCTICA | |||||
著者名よみ |
ヒロイ, ヨシクニ
× ヒロイ, ヨシクニ× シライシ, カズユキ× モトヨシ, ヨウイチ× カツシマ, タカヨシ |
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著者名(英) |
HIROI, Yoshikuni
× HIROI, Yoshikuni× SHIRAISHI, Kazuyuki× MOTOYOSHI, Yoichi× KATSUSHIMA, Takayoshi |
|||||
著者所属(英) | ||||||
en | ||||||
Department of Earth Sciences, Faculty of Science, Chiba University | ||||||
著者所属(英) | ||||||
en | ||||||
National Institute of Polar Research | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Geology and Mineralogy, Faculty of Science, Hokkaido University:(Present address)Department of Applied Geology, University of New South Wales | ||||||
著者所属(英) | ||||||
en | ||||||
Sumiko Consultants Co., Ltd. | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Metamorphosed calc-silicate rocks occur sporadically as small masses enclosed in other high-grade metasedimentary rocks of the Late Proterozoic Lutzow-Holm Complex in the Prince Olav and Soya Coasts, East Antarctica. Southwestward progressive metamorphism of the calc-silicate rocks is clarified which is in good agreement with the results of previous studies on the pelitic and basic-intermediate rocks. Two isograds are mapped on the basis of the continuous reaction epidote+quartz±calcite=grandite garnet+plagioclase+Fe-oxides±scapolite+H_2O and the discontinuous reaction grossular+quartz=wollastonite+anorthite in the amphibolite-facies and granulite-facies terrains, respectively. The latter is the best-defined isograd among those so far drawn in various rock types of the Lutzow-Holm Complex, as it is based on a vapor-absent reaction and the effects of additional components such as Fe_2O_3 and Na_2O on the reaction are estimated to have been negligible in the studied rocks. Pressure of about 7kb is evaluated by the discontinuous reaction at T=810±20℃ in the granulite-facies terrain. The present study, together with the previously published ones, confirms that the regional metamorphic geotherm of the Lutzow-Holm Complex based on the progressive mineral zones was of the medium-pressure type and was distinct from those of the adjacent Rayner and Yamato-Belgica Complexes. The occurrence of grossular with or without quartz in the granulite-facies terrain suggests that the vapor phase was generally poor in both H_2O and CO_2 during the high-grade metamorphism. | |||||
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 1, p. 73-97, 発行日 1987-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |