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.)

10:15 AM - 10:30 AM

[S1R6-06] Structural state of plagioclase within volcanic ash erupted from Sakurajima volcano during December 2020 to June 2021

*Tomoaki Matsui1, Tsuyoshi Tateyama1 (1. Kagoshima Univ. Educ.)

Keywords:Sakurajima, volcanic ash, plagioclase, powder X-ray diffraction , structural state

Plagioclases in ash from Sakurajima volcano were investigated to monitor the volcanic activity. Samples were collected from Dec 2020 to Jun 2021 at Kurokami Elementary, about 5 km east-northeast of Minami-dake crater of the volcano. Plagioclases in the samples were collected by magnetic and heavy liquid separation, and analyzed by X-ray diffraction to estimate their degree of structural order. Diffraction data suggest that the structural state changed with eruption frequency during this period.