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

[R3-12] Possible compositional area of Al bearing anhydrous bridgmanite at the uppermost lower mantle condition

*Masamichi NODA¹, Toru INOUE², Sho KAKIZAWA², Takaaki KAWAZOE², Toru SHINMEI³, Tetsuo IRIFUNE³, Koji OHARA⁴ (1. Hiroshima Uni. Sci., 2. Hiroshima Univ. Adv. Sci. Eng., 3. Ehime Univ. GRC, 4. JASRI)

Keywords:Al bearing bridgmanite, extremely anhydrous condition, the uppermost lower mantle

In this study, we investigated Al substitution mechanism in bridgmanite (Brg) as a function of Al content in extremely anhydrous condition. We used glass rod as starting material. The experiments were conducted at 28 GPa and 1700℃ for 100hours using a Kawai-type multi-anvil apparatus (Hiroshima Univ. and Ehime Univ.) at the uppermost lower mantle condition. The chemical compositions of the recovered individual Brg were measured by EPMA. The result, we confirmed the possible compositional area of Al bearing anhydrous Brg within Al 0.1 pfu.