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Pressure of the rutile–CaCl2 Ptr as a function of Al2O3 content. 1, from ref. 1; 2, from ref. 13; 3, from ref. 7; 4, this work. Shaded region shows the range of Ptr at mantle PT conditions, with the lower bound of dPtr/dT from (1) and upper bound from (4). Solid line, linear fit to experimental points; dashed line, maximum Al2O3 content observed in natural systems (19).
