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

[R3-04] Argon cycle in Earth’s interior

*Shigeaki Ono¹ (1. JAMSTEC)

Keywords:Argon, Equation of state, Melting temperature

The high-pressure study of physical properties of argon (Ar) has been performed by high-pressure experiments and first-principles calculations. The estimated density of Ar is smaller that of the PREM mantle, which indicates that the density crossover does not occur at the bottom of the lower mantle. The melting temperature of Ar has a significant pressure dependence. In the case of cold slab, solid Ar can be carried down into the deep mantle. Melting of solid Ar in the upwelling mantle plume occurs at the bottom of the transition zone.