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

[S1R6-05] Evolution of magma plumbing system beneath a submarine caldera after the Akahoya eruption at Kikai volcano

*Morihisa Hamada¹, Takeshi Hanyu¹, Iona M. McIntosh¹, Maria Luisa G. Tejada¹, Qing Chang¹, Takashi Miyazaki¹, Kenta Ueki¹, Bogdan S. Vaglarov¹, Tomoki Sato¹, Jun-Ichi Kimura¹, Satoru Tanaka¹, Katsuya Kaneko², Koji Kiyosugi², Reina Nakaoka², Kimihiro Nishimura² (1. JAMSTEC, 2. Kobe Univ.)

Keywords:Kikai caldera, Akahoya eruption, post-caldera volcanism

Kikai submarine caldera in SW Japan has undergone many eruptions, including catastrophic caldera-forming eruptions. It exhibits a double-caldera structure and consists of a giant rhyolitic lava dome (~32 km³) and satellite volcanic cones. We have conducted research cruises to Kikai caldera to unveil its history of eruptions and to monitor its current volcanic activities. We will report analytical results of volcanic rocks dredged from Kikai submarine caldera and satellite volcanic cones, estimate P-T conditions of magmas, and discuss evolution of the magma plumbing system.