R3: High-pressure science and deep Earth’s material

[R3-08] Influence of high oxygen fugacity on melting temperature of wadsleyite

[Presentation award entry]

*Kazutaka Yamaguch¹, Takaaki Kawazoe¹, Toru Inoue¹, Takeshi Sakai² (1. Hiroshima Univ. Advanced Science, 2. Ehime Univ. Geodynamics)

Keywords:Wadsleyite, Ferric iron, Oxygen fugacity

It is known that water and ferric iron are supplied to the mantle transition zone by subduction of the oceanic plates. A recent study revealed that ferric iron lowers melting temperature of bridgmanite, the major mineral in the lower mantle, in the MgO-FeO-Fe₂O₃-SiO₂ system (Sinmyo et al., 2019). Therefore, in this study, we conducted experiments to clarify the effect of high oxygen fugacity on the melting temperature of (Mg_0.9,Fe_0.1)₂SiO₄ wadsleyite using a Kawai-type multi-anvil press.
I will give you the results of my study.