Origin of Lateral Variations in 87Sr/86Sr Ratios of Quaternary Volcanic Rocks from the Kurile Arc in Hokkaido, Japan

Ikeda, Yasuo; Katsui, Yoshio; Kurasawa, Hajime

Origin of Lateral Variations in 87Sr/86Sr Ratios of Quaternary Volcanic Rocks from the Kurile Arc in Hokkaido, Japan

Ikeda, Yasuo; Katsui, Yoshio; Kurasawa, Hajime

北海道大学理学部紀要, 1987, 22(2), 325-335

Permalink : https://hdl.handle.net/2115/36753

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アクセス権	open access
URI	https://hdl.handle.net/2115/36753
タイトル	Origin of Lateral Variations in 87Sr/86Sr Ratios of Quaternary Volcanic Rocks from the Kurile Arc in Hokkaido, Japan
著者	Ikeda, Yasuo ; Katsui, Yoshio ; Kurasawa, Hajime
著者名 Ikeda, Yasuo
著者名 Katsui, Yoshio
著者名 Kurasawa, Hajime
言語	英語
発行日	1987-08
出版者	北海道大学
出版者	Hokkaido University
収録物名	北海道大学理学部紀要
収録物名	Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy
巻(号)	22(2)
ページ	325-335
抄録	87Sr/86Sr ratios were examined for volcanic rocks from Quaternary volcanoes in the Kurile arc in Hokkaido, Japan. The results show that the ratios decrease immediately away from the volcanic front, then increase in the middle part of the arc, but decrease again toward the back-arc side. The complex lateral variations of the ratios can be ascribed to breakdown of different minerals in the mantic wedge, i.e. amphibole decomposes beneath the volcanic front, whereas phlogopite breaks down beneath the middle part of the arc. Geochemical characters of the rocks from Rishiri volcano, located furthest away from the volcanic front arc quite different from those commonly observed in the trench-arc systems. The characters are similar to those of lavas from Deception island, located in Bransfield Strait formed by bad-arc spreading. This suggests that the Rishiri volcanism is independent of the arc magmatism.
資源タイプ	紀要論文
出版タイプ	Version of Record
PISSN	0018-3474