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Two types of gabbroic xenoliths from rhyolite dominated Niijima volcano, northern part of Izu-Bonin arc: petrological and geochemical constraints
http://hdl.handle.net/2241/00146416
http://hdl.handle.net/2241/00146416fd1369bf-e6fc-4328-8222-b9a62bcb9060
名前 / ファイル | ライセンス | アクション |
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OG_9-1 (1.8 MB)
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Item type | Journal Article(1) | |||||
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公開日 | 2017-06-08 | |||||
タイトル | ||||||
タイトル | Two types of gabbroic xenoliths from rhyolite dominated Niijima volcano, northern part of Izu-Bonin arc: petrological and geochemical constraints | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
Arakawa, Yoji
× Arakawa, Yoji× Endo, Daisuke× Ikehata, Kei× Oshika, Junya× Shinmura, Taro× Mori, Yasushi |
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著者別名 |
荒川, 洋二
× 荒川, 洋二× 池端, 慶 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | We examined the petrography, petrology, and geochemistry of two types of gabbroic xenoliths (A- and B-type xenoliths) in olivine basalt and biotite rhyolite units among the dominantly rhyolitic rocks in Niijima volcano, northern Izu-Bonin volcanic arc, central Japan. A-type gabbroic xenoliths consisting of plagioclase, clinopyroxene, and orthopyroxene with an adcumulate texture were found in both olivine basalt and biotite rhyolite units, and B-type gabbroic xenoliths consisting of plagioclase and amphibole with an orthocumulate texture were found only in biotite rhyolite units. Geothermal- and barometricmodelling based on mineral chemistry indicated that the A-type gabbro formed at higher temperatures (899–955°C) and pressures (3.6–5.9 kbar) than the B-type gabbro (687–824°C and 0.8–3.6 kbar). These findings and whole-rock chemistry suggest different parental magmas for the two types of gabbro. The A-type gabbro was likely formed from basaltic magma, whereas the B-type gabbro was likely formed from an intermediate (andesitic) magma. The gabbroic xenoliths in erupted products at Niijima volcano indicate the presence of mafic to intermediate cumulate bodies of different origins at relatively shallower levels beneath the dominantly rhyolitic volcano. | |||||
書誌情報 |
Open Geosciences 巻 9, 号 1, p. 1-12, 発行日 2017-05 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 2391-5447 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1515/geo-2017-0001 | |||||
権利 | ||||||
権利情報 | © 2017 Y. Arakawa et al., published by De Gruyter Open. | |||||
権利 | ||||||
権利情報 | This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. | |||||
著者版フラグ | ||||||
値 | publisher | |||||
出版者 | ||||||
出版者 | De Gruyter Open |