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We report the TiO2 solubility in garnet and orthopyroxene coexisting with rutile calibrated from ex- perimental data at pressures 7-20 kbar and temperatures 850-1300°C in two Antarctic granulite systems. The Ti would substitute for the tetrahedral Si, whereas we could not find positive evidence of the coupled substitution of M-Ti (M is Mg or Fe) for Al-Al in octahedral sites as well as the interstitial substitution of-Ti ( is a vacancy) for M-M in triangular-dodecahedral sites of garnet at ultrahigh-temperature (UHT) metamorphic conditions. The TiO2 content of garnet increases with temperature and decreases with pressure. In orthopyroxene Ti substitutes for atoms in the tetrahedral and octahedral sites. The Ti content of orthopyroxene increases with temperature and increases with pressure. Titanium solubility in garnet and orthopyroxene is not so sensitive to pressure change as compared with temperature dependence given by following empirical equations:

Solubility of TiO<sub>2</sub> in garnet and orthopyroxene: Ti thermometer for ultrahigh-temperature granulites