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静岡大学地球科学研究報告 (1975-) >
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タイトル: 小笠原諸島, 父島北部の石英含有無人岩 : 無人岩と石英デイサイトのマグマの混合
その他のタイトル: Quartz-bearing boninite from northern Chichi-jima, Bonin Islands : Magma mixing of boninite with quartz dacite
著者: 渡邉, 綾香
黒田, 直
掲載誌名: 静岡大学地球科学研究報告
出版者: 静岡大学地球科学教室
巻: 27
開始ページ: 1
終了ページ: 9
出版日付: 2000-07
NDC: 458
抄録: Submarine boninite series volcanic rocks with quartz dacite and subordinate submarine sedimentary rocks, belonging to middle Eocene to late Oligocene in age, are widespread on Chichi-jima. Quartz-bearing boninite is found to occur as the chilled rims of dikes, east of Kiyose and southwest of Tsuri-hama. On Miyano-hama near Kiyose, boninite pillows are intruded by a multiple dike of dacite and boninite. The multiple dike suggests the existence of a density-stratified chamber capped by dacite. The quartz-bearing boninite includes about 4 mm across corroded quartz up to several modal%, with reversely zoned orthopyroxenes carrying pale brown rounded cores and sieved orthopyroxenes. Based on the textures, these inclusions are xenocrysts, derived from quartz dacite. The chemical composition of the dike rims from Kiyose is nearly constant according to the whole rock analyses. Glasses in the same dike rims, with related ones of the Miyano-hama multiple dike, were analysed by electron probe to compare in genesis the compositions. In the oxides (e.g., MgO)-SiO_2,relationship for the boninite series volcanic rocks of Chichi-jima, the linear relationship of MgO to SiO_2,is obvious in a quartz-bearing boninite as the dike rims from Kiyose, in a more magnesian boninite as the chilled rim of the Miyano-hama multiple dike and a quartz dacite lava. Inferring from the field and the petrological evidence, quartz-bearing boninite was formed by rapid mixing of boninitic magma and a small amount of quartz dacite magma in a similar chamber to the possible stratified chamber beneath Miyano-hama.
ISSN: 03886298 OPAC
NII論文ID: 110000413395 ciniia
NII書誌ID: AN00103190 OPAC ciniib
バージョン: publisher
出現コレクション:2000 27

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Others By: 渡邉, 綾香 -- 黒田, 直 (クロダ, ナオシ) (Kuroda, Naoshi)



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