Abstract
The effects of melt composition, temperature and pressure on the solubility of fluorite (CaF2), i.e., fluorine concentration in silicate melts in equilibrium with fluorite, are summarized in this paper. The authors present a statistic study based on experimental data in literature and propose a predictive model to estimate F concentration in melt at the saturation of fluorite (C Fl-satF in melt ). The modeling indicates that the compositional effect of melt cations on the variation in C Fl-satF in melt can be expressed quantitatively as one parameter FSI (fluorite saturation index): FSI=(3AlNM+Fe2++6Mg+Ca+1.5Na-K)/(Si+Ti+AlNF+Fe3+), in which all cations are in mole, and AlNF and AlNM are Al as network-forming and network-modifying cations, respectively. The dependence of C Fl-satF in melt on FSI is regressed as: C Fl-satF in melt =1.130−2.014·exp (1 000/T)+2.747·exp (P/T)+0.111·C H2Omelt +17.641·FSI, in which T is temperature in Kelvin, P is pressure in MPa, C H2Omelt is melt H2O content in wt.%, and C Fl-satF in melt is in wt.% (normalized to anhydrous basis). The reference dataset used to establish the expression for conditions within 540–1 010 °C, 50–500 MPa, 0–7 wt.% melt H2O content, 0.4 to 1.7 for A/CNK, 0.3 wt.%–7.0 wt.% for C Fl-satF in melt . The discrepancy of C Fl-satF in melt between calculated and measured values is less than ±0.62 wt.% with a confidence interval of 95%. The expression of FSI and its effect on C Fl-satF in melt indicate that fluorine incorporation in silicate melts is largely controlled by bonding with network-modifying cations, favorably with Mg, AlNM, Na, Ca and Fe2+ in a decreasing order. The proposed model for predicting C Fl-satF in melt is also supported by our new experiments saturated with magmatic fluorite performed at 100–200 MPa and 800–900 °C. The modeling of magma fractional crystallization emphasizes that the saturation of fluorite is dependent on both the compositions of primary magmas and their initial F contents.
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This study was supported by the National Natural Science Foundation of China (No. 41902052) and the German Research Foundation (DFG) (No. BE 1720/40). We thank two anonymous reviewers for their helpful comments that have substantially improved this paper. The final publication is available at Springer via https://doi.org/10.1007/s12583-020-1305-y.
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Li, X., Zhang, C., Wang, L. et al. Experiments on the Saturation of Fluorite in Magmatic Systems: Implications for Maximum F Concentration and Fluorine-Cation Bonding in Silicate Melt. J. Earth Sci. 31, 456–467 (2020). https://doi.org/10.1007/s12583-020-1305-y
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DOI: https://doi.org/10.1007/s12583-020-1305-y