On the mechanisms and kinetics of oxygen isotope exchange in quartz and feldspars at elevated temperatures and pressures.

Stereological and scanning electron microscope (SEM) analyses of quartz-water and plagioclase feldspar-water interactions have been combined with ¹⁸ O/ ¹⁷ O and ¹⁷ O/ ¹⁶ O measurements of the associated isotope exchange, in an attempt to develop an understanding of mineral-water interactions at elevated temperatures and pressures. Results are described and discussed. Equilibrium ¹⁸ O ¹⁶ O fractionation factors for both quartz-water and albite-water agree well with those measured previously in this laboratory.-from Authors