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Experiments have been carried out from 500 to 1200 °C, 1 atm to 10 kbar, and f H₂  from that of the IQF buffer to air, to quantify the variation of Fe oxy-component content in a titanian pargasite megacryst amphibole from Vulcan's Throne, Arizona. The results document the operation of the following substitution mechanism in the amphibole crystal structure: Fe 2+  + OH -  = Fe 3+  + O 2 - + ½H 2  whereby the Fe 3+ /Fe tot  of the amphibole is controlled by T, P, and f H₂  For the amphibole composition that was investigated, there is a linear variation of log f H₂  as a function of log (Fe 3+ /Fe 2+ ) at fixed T and P of the form log f H₂  = a + b log(Fe 3+ /Fe 2+  ). Values of a and bare:

An experimental study of phase equilibria and Fe oxy-component in kaersutitic amphibole: Implications for the f H₂ and a H₂O in the upper mantle