Presentation Information
[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.