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

[R3P-11] Rheology of the subducted slab in the lower mantle

*Shintaro Azuma^1,2, Ryuichi Nomura^3,4, Kentaro Uesugi⁵, Yu Nishihara⁴, Shunta Doi⁴, Takeshi Arimoto⁴, Tetsuo Irifune⁴ (1. Tokyo Tech, 2. Kyushu Univ, 3. Kyoto Univ, 4. Ehime Univ, 5. JASRI/SPring-8)

Keywords:rDAC, bridgmanite, ferropericlase, lower mantle, rheology

The rheological properties of lower-mantle materials are key to understanding the dynamics and evolution in the Earth’s interior. In this study, we developed the rotational diamond anvil cell (rDAC) and conducted the deformation experiments of lower-mantle materials using this rDAC (P = 26–130 GPa, T = 300–1073 K). The deformation microstructures of the recovered samples showed that ferropericlase formed an interconnected weak layer. Equivalent stress of ferropericlase is relatively constant with strain, whereas that of bridgmanite shows the strain weakening.