Japan Geoscience Union Meeting 2018

Presentation information

[EJ] Evening Poster

S (Solid Earth Sciences) » S-CG Complex & General

[S-CG57] Dynamics in mobile belts

Wed. May 23, 2018 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Yukitoshi Fukahata(Disaster Prevention Research Institute, Kyoto University), Toru Takeshita(Department of Natural History Sciences, Graduate School of Science, Hokkaido University), Hikaru Iwamori(海洋研究開発機構・地球内部物質循環研究分野)

[SCG57-P32] Ultrasonic velocity measurements of plycrystalline clinopyroxene under high P-T conditions

*Yumiko Tsubokawa1, Masahiro Ishikawa1 (1.Yohokohama National University)

Keywords:elastic velocity, clinopyroxene, submicron

Ultrasonic elastic velocity measurements of polycrystalline clinopyroxene with submicron-sized grains were conducted under high P-T conditions in a piston-cylinder apparatus. We prepared nano-sized powders of clinopyroxene from naturally occurring clinopyroxene single crystal and successfully fabricated fine-grained polycrystalline clinopyroxene. P and S wave velocities are determined as a function of pressure to 1.0 GPa at temperatures up to 650 °C for Vp and 750 °C for Vs. At room temperature, Vp, Vs and Vp/Vs increased during pressurization. On the other hand, at 1.0 GPa, Vp and Vs decreased and Vp/Vs slightly increased with increasing temperature. From P and S wave velocities and estimated density, we calculated the elastic constants of clinopyroxene and found that the bulk modulus obtained in this study is smaller than previously published data.