The P-T conditions of both equilibria were determined precisely by reversal experiments in a piston-cylinder apparatus. On the basis of 8 experiments, brackets for the rutile-magnesite-geikielite equilibrium are 7.0–7.1 kbar at 800 ° C, 8.6–8.7 kbar at 850 ° C, and 10.5–10.7 kbar at 900 ° C. On the basis of 9 experiments, brackets for the zircon-magnesite-baddeleyite-forsterite equilibrium are 7.1–7.7 kbar at 800 ° C, 9.2–9.4 kbar at 850 ° C, and 10.7–10.9 kbar at 900 ° C. Considering experimental uncertainties in P (±300 bars) and T (±3 ° C), equilibrium curves calculated from both the Berman and...

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