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

[S1R6-10] Estimation of emplacement depth of granitoid pluton using melt inclusions in zircon: An example of the Miuchi pluton, Ehime Prefecture

[Presentation award entry]

*Yuka Taniwaki¹, Kazuya Shimooka¹, Satoshi Saito¹ (1. Ehime Univ. Sci.)

Keywords:melt inclusion, granite, zircon, emplacement depth

We performed homogenization experiments of melt inclusions in zircons separated from a granite sample in the Miocene Miuchi pluton. The melt inclusion compositions obtained through SEM-EDS analysis were granitic and their SiO₂ contents were higher than whole-rock composition of the sample used for zircon separation. We used the rhyolite-MELTS geobarometer to calculate the equilibration pressures of melt, quartz and feldspar. Based on the results, we estimated 91±13 MPa (about 3.5 km depth) as emplacement pressure of Miuchi pluton from the compositions of zircon melt inclusions.