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

[S1R6-07] Determination of chemical composition of andesite endmember magmas produced by magma mixing

*Ikuo Okada¹, Tomoyuki Shibata¹, Masako Yoshikawa¹, Hidemi Ishibashi², Takeshi Sugimoto³, Yasutaka Hayasaka¹ (1. Hiroshima Univ. , 2. Shizuoka Univ., 3. Geothermal Engineering Co., Ltd.)

Keywords:andesite, amphibole, magma mixing, Yufu volcano

To elucidate in detail the origin of andesite magma, we analyze the major and trace element compositions of amphibole in andesite from Quaternary Yufu volcano, located in northeastern Kyushu, Japan, . Previously, we systematically estimated the temperature, pressure, and major and trace element compositions of melts in equilibrium with amphibole in the andesite from Yufu volcano (Okada et al. 2021). Here, we report a method for directly estimating the chemical composition of the endmember magmas of andesite produced by magma mixing.