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Vol.XIX, Nos.1-2 >

Genesis of Calc-Alkalic Andesites from Oshima-Ōshima and Ichinomegata Volcanoes, North Japan

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Title: Genesis of Calc-Alkalic Andesites from Oshima-Ōshima and Ichinomegata Volcanoes, North Japan
Authors: Katsui, Y. Browse this author
Yamamoto, M. Browse this author
Nemoto, S. Browse this author
Niida, K. Browse this author
Issue Date: Mar-1979
Publisher: 北海道大学
Journal Title: 北海道大学理学部紀要
Journal Title(alt): Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy
Volume: 19
Issue: 1-2
Start Page: 157
End Page: 168
Abstract: Ultramafic inclusions in volcanic rocks occur commonly in alkalic rocks. Recently we have examined some of their host rocks in Japan, and found that most of the inclusions from Oshima-Ōshima and Ichinomegata volcanoes, north Japan, occur in calc-alkalic andesite. Occurrence of such inclusions may be significant for the origin of calc-alkalic andesite which is a characteristic volcanic product in island arcs. On the basis of field petrology of Oshima-Ōshima and Ichinomegata volcanoes, two different possible processes are suggested for the genesis of the calc-alkalic andesite magmas, i.e. 1) fractional crystallization of basaltic magma, and 2) partial melting of the upper mantie, respectively.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/36679
Appears in Collections:Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy > Vol.XIX, Nos.1-2

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