Physics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..835o&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 5, p. 835-838
Physics
36
Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineral Physics: High-Pressure Behavior, Tectonophysics: Earth'S Interior-Composition And State
Scientific paper
In situ observations of the ilmenite-perovskite transition in MgSiO3 were carried out in a multianvil high-pressure apparatus interfaced with synchrotron radiation. The phase boundary between ilmenite and perovskite in the temperature range of 1300-1600 K was determined to be P (GPa)=28.4(+/-0.4)-0.0029(+/-0.0020)T (K) based on Jamieson's equation of state of gold [Jamieson et al., 1982] and P (GPa)=27.3(+/-0.4)-0.0035(+/-0.0024)T (K) based on Anderson's equation of state of gold [Anderson et al., 1989]. The consistency of our results, using Jamieson's equation of state, with previous studies obtained by quench methods leads us to conclude that the 660 km seismic discontinuity in the mantle can be attributed a phase transition to perovskite phase. However, the phase boundary based on the Anderson's equation of state implies that the depth of the 660-km seismic discontinuity does not match the pressure of this transition.
Funakoshi Kenichi
Ito Emi
Kanzaki Makoto
Katsura Takashi
Ono Satoshi
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