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Predicting phosphate saturation in silicate magmas: An experimental study of the effects of melt composition and temperature |
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| Authors: | N Tollari MJ Toplis S-J Barnes |
| Institution: | a Université du Québec, Chicoutimi, Canada G7H 2B1 b CRPG-CNRS, BP20, F-54501, Vandoeuvre-les-Nancy, France c DTP (UMR 5562), Observatoire Midi-Pyrénées, 14, Av. E. Belin, F-31400 Toulouse, France |
| Abstract: | A series of 1 atm experiments has been performed to test the influence of iron content and oxidation state on the saturation of phosphate minerals in magmatic systems. Four bulk compositions of different iron content have been studied. The experiments cover a range of temperature from 1030 to 1070 °C and oxygen fugacity from 1.5 log units below to 1.5 log units above the Fayalite-Magnetite-Quartz buffer. The results demonstrate that neither iron content of the liquid nor oxidation state play a significant role on phosphate saturation. On the other hand, SiO2 and CaO contents of the liquid strongly influence the appearance of a crystalline phosphate. Our results are combined with data from the literature to define an equation which predicts the P2O5 content of silicate liquids saturated in either whitlockite or fluorapatite: |
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