R8: Metamorphic rocks and tectonics

[R8-13] Crystal size distribution and compositional zoning of garnet formed by two-stage growth in the Kotsu eclogite and basic schist, Sanbagawa belt

*Otgonbayar Dandar¹, Atsushi Okamoto¹, Masaoki Uno¹ (1. Tohoku University. Graduate School of Environmental Studies)

Keywords:Crystal size distribution, Compositional zoning, the Kotsu eclogite, Sanbagawa belt

The crystal size distribution (CSD) and compositional zoning (CZ) of garnet during prograde metamorphism are key information to elucidate the water release at the subduction interfaces. However, the data aquations of CSD from thin sections and the composition of “true” core are very difficult due to the cut effects. In this contribution, we showed the detailed data on the relationship between CSD and CZ of garnet in the Kotsu eclogite and basic schist in the Sanbagawa metamorphic belt, Japan.