R1: Characterization and description of minerals (Joint Session with The Gemmological Society of Japan)

[R1P-12] Alteration of boninite and the phillipsite formed in its amygdale

[Presentation award entry]

*Yuki Inoue¹, Kazuhiko Shimada¹, Mana Yasui², Atsushi Yamazaki², Hiroshi Hagiya⁴, Jun-ichiro Ishibashi³, Tasuku Akagi¹ (1. Kyushu Univ. Sci., 2. Waseda Univ., 3. Koube Univ., 4. Tokyo City Univ.)

Keywords:phillipsite, zeolites, boniniate

It is usually assumed that zeolites are formed by the decomposition of plagioclase.It has been reported that boninite does not contain plagioclase. Therefore, it is difficult to discuss the general formation process. In this study, we focus on the glassy part of boninite and discuss the formation process of zeolite from its chemical composition.