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

[R3-10] Olivine-spinel transformation under shear deformation: Conditions for transformation-induced weakening

*Kubo Tomoaki¹, Kazuya Moriyama¹, Yuichiro Mori¹, Masahiro Imamura¹, Sanae Koizumi², Yu Nishihara³, Akio Suzki⁴, Yuji Higo⁵, Yoshinori Tange⁵ (1. Kyushu Univ., Sci, 2. Tokyo Univ., ERI, 3. Ehime Univ., GRC, 4. Tohoku Univ., Sci, 5. JASRI)

Keywords:olivine-spinel transformation, shear deformation, reaction-induced weakening

Recent developments of high-pressure deformation apparatus such as D-DIA and D-111 type guideblock enable us to perform quantitative deformation experiments combined with synchrotron X-ray up to lower mantle pressures. By using these technieques, we are conducting olivine-spinel transfomation experiments in Fe₂SiO₄ and Mg₂SiO₄ under shear deformation. In this presentation, preliminary results of the syn-deformational transformation experiments, and briefly discuss about conditions for reaction-induced weakening.