Research on caldera-forming eruptions and vesiculation of magma chambers

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Purpose of this study is investigation on behavior of volatile material (H_2O, CO_2, S) in magma chambers of caldera-forming eruptions based on melt inclusion analysis. Melt inclusion analyses of Kikai-Tozurahara caldera-forming eruption (95 ka) a (1) vesiculation of the magma chamber with pressure decrease occurred just before the Kikai-Tozurahara caldera-forming eruption, and (2) two processes of pressure decrease and injection of CO_2gas to the magma chamber from a deeper part caused vesiculation of the magma chamber just before the Kikai-Akahoya caldera-forming eruption. In addition, SIMS analysis of melt inclusions was improved and melt inclusions of the other four caldera-forming eruptions (Aira, Ata , Aso3 and Aso4)were prepared for their analyses in this study.