Experiments on the Saturation of Fluorite in Magmatic Systems: Implications for Maximum F Concentration and Fluorine-Cation Bonding in Silicate Melt

Xiaoyan Li; Chao Zhang; Lianxun Wang; Harald Behrens; Francois Holtz

doi:10.1007/s12583-020-1305-y

Volume 31 Issue 3

Jul 2020

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Journal of Earth Science > 2020 > 31(3): 456-467.

Xiaoyan Li, Chao Zhang, Lianxun Wang, Harald Behrens, Francois Holtz. Experiments on the Saturation of Fluorite in Magmatic Systems: Implications for Maximum F Concentration and Fluorine-Cation Bonding in Silicate Melt. Journal of Earth Science, 2020, 31(3): 456-467. doi: 10.1007/s12583-020-1305-y

Citation:

Xiaoyan Li, Chao Zhang, Lianxun Wang, Harald Behrens, Francois Holtz. Experiments on the Saturation of Fluorite in Magmatic Systems: Implications for Maximum F Concentration and Fluorine-Cation Bonding in Silicate Melt. Journal of Earth Science, 2020, 31(3): 456-467. doi: 10.1007/s12583-020-1305-y

Citation:

Xiaoyan Li, Chao Zhang, Lianxun Wang, Harald Behrens, Francois Holtz. Experiments on the Saturation of Fluorite in Magmatic Systems: Implications for Maximum F Concentration and Fluorine-Cation Bonding in Silicate Melt. Journal of Earth Science, 2020, 31(3): 456-467. doi: 10.1007/s12583-020-1305-y

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Experiments on the Saturation of Fluorite in Magmatic Systems: Implications for Maximum F Concentration and Fluorine-Cation Bonding in Silicate Melt

doi: 10.1007/s12583-020-1305-y

Xiaoyan Li^{1, 2
,},
Chao Zhang^{1, 2
,
,
,},
Lianxun Wang³,
Harald Behrens²,
Francois Holtz²

1.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China
2.
Institute of Mineralogy, Leibniz University Hannover, Hannover 30167, Germany
3.
State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

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Corresponding author: Chao Zhang, ORCID:0000-0001-7019-5075.E-mail:zhangchao@nwu.edu.cn
Received Date: 05 Mar 2020
Accepted Date: 18 Apr 2020
Publish Date: 01 Jun 2020

Abstract

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_{F in melt}^Fl-sat). The modeling indicates that the compositional effect of melt cations on the variation in C_{F in melt}^Fl-sat can be expressed quantitatively as one parameter FSI (fluorite saturation index):FSI=(3Al^NM+Fe²⁺+6Mg+Ca+1.5Na-K)/(Si+Ti+Al^NF+Fe³⁺), in which all cations are in mole, and Al^NF and Al^NM are Al as network-forming and network-modifying cations, respectively. The dependence of C_{F in melt}^Fl-sat on FSI is regressed as:C_{F in melt}^Fl-sat=1.130-2.014·exp (1 000/T)+2.747·exp (P/T)+0.111·C_melt^H2O+17.641·FSI, in which T is temperature in Kelvin, P is pressure in MPa, C_melt^H2O is melt H₂O content in wt.%, and C_{F in melt}^Fl-sat is in wt.% (normalized to anhydrous basis). The reference dataset used to establish the expression for conditions within 540-1 010 ℃, 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_{F in melt}^Fl-sat. The discrepancy of C_{F in melt}^Fl-sat 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_{F in melt}^Fl-sat indicate that fluorine incorporation in silicate melts is largely controlled by bonding with network-modifying cations, favorably with Mg, Al^NM, Na, Ca and Fe²⁺ in a decreasing order. The proposed model for predicting C_{F in melt}^Fl-sat is also supported by our new experiments saturated with magmatic fluorite performed at 100-200 MPa and 800-900 ℃. 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.KEY WORDS:fluorine, fluorite solubility, silicate melt, experimental petrology.
- fluorine,
- fluorite solubility,
- silicate melt,
- experimental petrology

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References(58)

References

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Experiments on the Saturation of Fluorite in Magmatic Systems: Implications for Maximum F Concentration and Fluorine-Cation Bonding in Silicate Melt

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