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Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy >
Vol.XXI, No.3 >

Major, Trace, and Rare Earth Element Abudances in Boninitic Lavas from the Ogasawara Forearc

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タイトル: Major, Trace, and Rare Earth Element Abudances in Boninitic Lavas from the Ogasawara Forearc
著者: Johnson, Kevin T.M. 著作を一覧する
発行日: 1985年 8月
出版者: 北海道大学 = Hokkaido University
誌名: 北海道大学理学部紀要 = Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy
巻: 21
号: 3
開始ページ: 453
終了ページ: 463
抄録: Dredged andesites and dacites from the Ogasawara forearc contain high abundances of MgO at high SiO2, high K2O, low rare earth element abundances and flat patterns, and very low TiO2 contents. The chemical character and geologic setting support the interpretation that these lavas are evolved members of the boninite series formed by high degrees of partial melting of a previously depleted arc source, followed by enrichment in K, Th, and large-ion lithophile elements, and finally differentiated to higher SiO2 contents than are usually found in boninites. This is consistent with existing tectonic models of the Izu-Mariana arc system in which young, hot Philippine Sea crust produced high geothermal gradients in this region from the Tertiary.
資料タイプ: bulletin (article)
URI: http://hdl.handle.net/2115/36738
出現コレクション:Vol.XXI, No.3

 

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