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

11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)

[S1R6-08] Geochemical features of crustal xenoliths in dacite of Hime-shima volcanic group, Oita Prefecture, Southwest Japan, and their relationship to Quaternary magma evolution processes.

*Takehiro Hirayama¹, Tomoyuki Shibata¹, Masako Yoshikawa¹, Yasutaka Hayasaka¹, KAUSHIK DAS¹, Keiji Takemura² (1. Hiroshima Univ. Sci., 2. Kyoto Univ.)

Keywords:

xenolith,volcano,Trace element,magma evolution process

HVG (Hime-shima Volcanic Group) is located offshore of Kunisaki Peninsula, western Seto Inland Sea, Oita Prefecture. We conducted petrography, major and trace element compositional analyses, and zircon U–Pb geochronological analysis. We found metamorphic, volcanic, and sedimentary xenoliths in addition to plutonic xenoliths from boulders on the coastline near Kane Lava of the HVG. We will also discuss whether these crustal xenoliths have influenced the magma evolution process of the HVG.