How can we have a fixed T?
- A simple way : T at the seismic discontinuity
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- by comparing the discontinuity depth with the transition pressure
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- This is a quite old idea, but…
- However, is the discontinuity depth a simple function of T?
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- Effect of water and iron content on the phase relations
Phase diagram of Ol-Wd transition
- Phase diagram of the Ol-Wd transition by Katsura et al. [2004a]
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- Calculate P using the MgO scale proposed by Matsui et al. [2000]
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- Recently new pressure scales were proposed
- P calculation by Katsura et al. [2004a] using Matsui scale had insufficient precision
- Recalc. of the trans. P by
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- Two new P scales prop. by Tange et al. [2009].
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- Reproduce recent exp. data
- 2 EoS’s
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- 3rd-order B-M EoS
- Vinet EoS
- More precise program for the Matsui scale
- The recalc. trans. P are 0.35~0.65 GPa lower than Katsura et al. [2004]
- Matsui (rev) > Tange-V > Tange-3BM
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- Difference of each: 0.15 GPa