Physics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3213313h&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 13, CiteID L13313
Physics
27
Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineral Physics: High-Pressure Behavior, Mineral Physics: Physical Thermodynamics, Tectonophysics: Dynamics: Convection Currents, And Mantle Plumes, Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105)
Scientific paper
The Clapeyron slope of the perovskite to post-perovskite phase transition has not been well determined experimentally. Crystal structure of CaIrO3 is equivalent to the MgSiO3 post-perovskite phase (space group: Cmcm) at ambient condition. We have found that perovskite phase (Pbnm) of CaIrO3, which is isostructural with MgSiO3 perovskite, is stable at 1-3 GPa and 1400-1550°C. The perovskite to post-perovskite phase transition in CaIrO3 was determined by using piston-cylinder apparatus at 0.9-3.0 GPa and 1350-1550°C. Results show that phase transition pressure is strongly temperature-sensitive with a Clapeyron slope of +17(+/-3) MPa/°C. These results, obtained for a suitable analogue material, suggest that post-perovskite phase transition in MgSiO3 also has a large positive value of the Clapeyron slope. Such a pronounced exothermic reaction in the Earth's lowermost mantle will promote the upwelling of high-temperature plumes from the core-mantle boundary region.
Fujita Yosuke
Hirose Kei
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