Abstract
Ca, Sr and Ba contents of various volcanic rocks (basalts, andesites, dacites and a granitic xenolith) from the Higashi-Izu monogenetic volcano group, the Izu Peninsula, Japan, have been determined by an ICP-OES method. The results indicate that the monogenetic volcano group makes a Sr/Ca-Ba/Ca systematics which is similar to that defined by a stratovolcano. The SB systematics suggests that there are two different high alumina basalt magmas in the Higashi-Izu monogenetic volcano group: one (basalt I) is a primitive basalt magma derived from the mantle with rather small degree of partial melting and the other (basalt II) is a mixture of the primitive basalt magma and a cumulus phase enriched in plagioclase. The high alumina basalt series (basalt (I)-andesite-dacite series) is considered to be established, not by crystal fractionation process in magma chamber, but by assimilation process of the primary basalt magma with the granitic crust. The crust under the Izu Peninsula may have a chemical composition similar to that of the dacite(I) from Kawagodaira.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
