To assess the concentration of potassium in aqueous fluids as a model for metasomatism of the mantle of the Earth, we experimentally determined the solubility of potassium in an aqueous vapor in equilibrium with phlogopite and other phases to pressures of 30 kbar at 1100°C. The concentration of potassium (in grams of K2O per 100 g H2O) is 4 at 11 kbar, 7 at 20 kbar, and 25 at 30 kbar. Such values are sufficient to transfer from the interior of the Earth all of the K2O to the continental crust during formation of the hydrosphere by outgassing. However, it is likely that most of this transport was by silicate-rich liquids.

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