The titanium-in-quartz (TitaniQ) thermobarometer: A critical examination and re-calibration

Synthetic quartz was grown in rutile-bearing H2O (±NaCl) fluids at 600–800 °C and 1–10 kbar by dissolution and reprecipitation of quartz in a small thermal gradient. Rapid attainment of rutile saturation is proved by the formation of rutile crystals at the contact between old quartz substrate and new quartz overgrowth in several experiments. Titanium concentrations in new quartz correlate positively with the concentrations of Li and Al and...