Oxygen isotope fractionation between quartz and K-feldspar at 600°C

Quartz and K-feldspar were grown and/or equilibrated in a common fluid at 600°C, and were analyzed mass-spectrometrically as pairs. Various errors that could affect quartz-feldspar oxygen isotope temperature calibrations that are derived from quartz-solution and feldspar-solution data of different studies, are thereby avoided. Using a range of starting materials, we obtained10³ lnα(quartz-K-feldspar) = 1.8 ± 0.15, a value in reasonable agreement with geological data.