2022 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)

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Oral presentation

S1/R6 Joint session: Earth materials science related to igneous processes/Plutonic rocks, volcanic rocks and subduction factory

Sun. Sep 18, 2022 9:00 AM - 12:15 PM B351 (Adv. Edu. Res. Bldg. E-3F)

Chairperson: Atsushi Kamei(Shimane Univ.), Tatsuhiko Kawamoto(Shizuoka Univ.), Morihisa Hamada(JAMSTEC), Masao Banno(Yamagata Univ.)

9:45 AM - 10:00 AM

[S1R6-04] Crystallization experiments of supercooled rhyolitic melt

*Tamotsu Sugawara1, Shumpei Yoshimura1 (1. Hokkaido Univ. Sci.)

Keywords:Crystallization, Cristobalite, Spherulite, Secondary boiling

We conducted crystallization experiments of supercooled rhyolitic melt to reveal how crystallization and vesiculation occur inside silicic lavas. Results showed that various types of crystals and vesicles were formed in the sample. A cristobalite layer was formed on the sample surface and a spherulite layer developed on that layer. Spherulites also formed in the interior of the sample. Vesicularity of the melt increased with time as a result of secondary boiling driven by spherulite formation.