The solubility of rutile in H2O (±NaCl, albite)-fluids was measured by direct observation of dissolving mineral grains within the hydrothermal diamond anvil cell. This new approach for studying mineral solubilities at high p/T has the advantage that the sample eventually gets completely dissolved and can be visually observed during this process, which eliminates the risk of overestimating true solubilities due to dissolution and reprecipitation during the run. Our measured rutile solubilities in pure H2O are up to 1000 times lower than those reported in previous studies, ranging from 8 ppm to 26 ppm at 850–1000 °C/1.2–2.3 GPa. Nonlinear least square fitting of the data set resulted in the following equation for rutile solubility in pure water:cTiO2,fluid=A·exp(−ΔH°RT)·exp(−ΔV°RT·(p−1bar)),
Andreas Audé,tat,,et al. Solubility of rutile in subduction zone fluids, as determined by experiments in the hydrothermal diamond anvil cell[J]. Earth and Planetary Science Letters,2005-01-01,Volume 232, Issues 3–4(Issues 3–4)