2019 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 19 - Sep 23, 2019Kyushu University Ito Campus
2019 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 19 - Sep 23, 2019Kyushu University Ito Campus
[S1-01]Reconstruction of lithosphere-asthenosphere boundary in arc settings by geobarometry of spinel peridotites from Ichinomegata, NE Japan「発表賞エントリー」
*Yuto Sato1, Kazuhito Ozawa1(1. Univ. Tokyo Sci.)
Keywords:
lithosphere-asthenosphere boundary,geobarometry,spinel peridotite xenolith,wet solidus
This study reports the reconstruction of structures and formation conditions of the lithosphere-asthenosphere boundary zone (LABZ), which is based on the estimation of depths for the 9 spinel peridotite xenoliths from Ichinomegata. The LABZ beneath Ichinomegata was present at 41-55 km depths and was substantiated by the development of deformation microstructure during a heating event just before the xenolith derivation which caused partial melting. The concurrence of the deformation and the partial melting at LABZ indicates that LABZ in arc settings is controlled by wet solidus.