HR: 0800h
AN: DI41A-0345    [Abstracts]
TI: Equation of state of MgSiO3-perovskite
AU: * Tange, Y
EM: tan@sci.ehime-u.ac.jp
AF: Ehime University, 2-5 Bunkyo-cho, Matsuyama, Ehime, 790-8577, Japan
AU: Irifune, T
EM: irifune@dpc.ehime-u.ac.jp
AF: Ehime University, 2-5 Bunkyo-cho, Matsuyama, Ehime, 790-8577, Japan
AU: Funakoshi, K
EM: funakosi@spring8.or.jp
AF: Japan Synchrotron Radiation Research Institute, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan
AB: In-situ X-ray diffraction measurements of MgSiO3-perovskite were performed in the pressure range of 27-61 GPa and temperature of 300-1500 K using Kawai-type multi-anvil apparatus with sintered diamond anvils, in a synchrotron radiation facility. Mg2SiO4-forsterite was used as a starting material, and MgSiO3-perovskite was synthesized during heating period. XRD measurements were carried out in cooling cycle of each experiment. Au was used as an internal pressure standard, which was mixed with the starting material. In addition, MgO was used another pressure standard, which was synthesized from the decomposition of the starting material. Temperature was successfully measured using W3Re-W25Re thermocouple in every experiment, and temperature fluctuations were less than 1 K for XRD measurements of 60 minutes. Errors in volume determination of each phase were about 0.5 %, and typical error in pressure calculation was 0.2 GPa. In this study, we can provide internally consistent and precisely determined P-V-T data set of MgSiO3-perovskite, MgO, and Au to mid lower mantle condition, which be a primary reference in the study of the lower mantle.
DE: 3630 Experimental mineralogy and petrology
DE: 3919 Equations of state
DE: 3949 Thermal expansivity
DE: 3954 X-ray, neutron, and electron spectroscopy and diffraction
DE: 3994 Instruments and techniques
SC: Study of the Earth's Deep Interior [DI]
MN: 2007 Fall Meeting