Abstract
The free energy data for the simple fluorides, chlorides and hydroxides have been used to predict the distribution of these anions in hydrous minerals. The calculated partition of fluorine in phlogopite agrees well with published results; the distribution of fluorine and hydroxyl between apatite and phlogopite is temperature dependent and has been calculated. The temperatures deduced from analyses of natural apatite-biotite pairs frequently show discrepancies as compared with independent temperature estimates; these probably arise from late-stage exchange of the fluorine in phlogopite with an aqueous fluid, for which independent evidence is available.
The fugacity of phosphorus in equilibrium with apatite, a ubiquitous hydrous mineral, has been calculated for various mineral assemblages. The estimates, which are subject to considerable error, are lower for basanites and alkali-basalts than for tholeiites and range from approximately 10−14 at 1000° C to 10−16 bars at 750° C for fayalitic rhyolites.
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Stormer, J.C., Carmichael, I.S.E. Fluorine-hydroxyl exchange in apatite and biotite: A potential igneous geothermometer. Contr. Mineral. and Petrol. 31, 121–131 (1971). https://doi.org/10.1007/BF00373455
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DOI: https://doi.org/10.1007/BF00373455