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

[R3-03] Effect of Al on high pressure hydrous minerals stable under mantle transition zone and lower mantle conditions

[Presentation award entry]

*Akio Ohta¹, Toru Inoue¹, Masamichi Noda⁴, Sho Kakizawa¹, Takaaki Kawazoe¹, Tomoko Sato¹, Toru Shinmei², Tetsuo Irifune², Naoya Sakamoto³, Hisayoshi Yurimoto³ (1. Hiroshima Univ. Adv. Sci. Eng., 2. Ehime Univ. GRC, 3. Hokkaido Univ. Sci., 4. Hiroshima Univ. Sci.)

Keywords:hydrous phase, mantle transition zone, coupling substitution, water content, lower mantle

Water is one of the major volatiles present in the Earth's surface layers, and it is continuously supplied to the Earth's interior by subducting slab. Water has a significant effect on the physical properties and melting temperatures of minerals. Al is the abundant element after Mg, Fe, and Si in subducting plate materials, and it has an odd valence (Al³⁺). Therefore the coupling substitution with H⁺ can increase the water content in minerals. We conducted an experimental study to clarify the differences in Al substitution patterns in various high pressure hydrous minerals.