文章基本信息

标题：Polybaric crystallization differentiation of H2O-saturated island arc low-K tholeiite magmas: a case study of the Izu-Oshima volcano in the Izu arc
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作者：Morihisa Hamada ; Yuko Okayama ; Takayuki Kaneko 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2014
卷号：66
期号：1
页码：1-10
DOI：10.1186/1880-5981-66-15
出版社：Springer Verlag
摘要：Island arc low-K tholeiites are basaltic magmas erupting from frontal arc volcanoes of juvenile arcs associated with the subduction of old and cold plates.We investigated the origins of geochemical variation in volcanic rocks having multiple phase saturated liquid compositions from the Izu-Oshima volcano in the northern Izu arc.The geochemical variations in the liquids fall between two endmember trends, namely higher- and lower-Al/Si trends.Polybaric differentiation of H2O-saturated melts between a 4-km-deep magma chamber and degassed melts near the surface should be responsible for the observed variation in the liquids.
关键词：Island arc low-K tholeiite ;Volcanic front ;Ca-rich plagioclase ;Experimental petrology ;Izu-Oshima volcano