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    Effect of fluorine on near-liquidus phase equilibria of an Fe–Mg rich basalt

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    Manuscript and figures (454.3Kb)
    Tables (72Kb)
    Date
    2012-03-26
    Author
    Filiberto, Justin  Concept link
    Wood, Justin  Concept link
    Dasgupta, Rajdeep  Concept link
    Shimizu, Nobumichi  Concept link
    Le, Loan  Concept link
    Treiman, Allan H.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5302
    As published
    https://doi.org/10.1016/j.chemgeo.2012.04.015
    Keyword
     Halogens; Martian meteorites; Alkali basalts; Basalt crystallization; Phase equilibria; Fluorine 
    Abstract
    Volatile species (H2O, CO2, F, Cl, etc) have important effects on the formation and crystallization history of basaltic magmas. Here, we have experimentally investigated the effects of F on phase equilibria of Fe-Mg-rich basalt. Our results show that fluorine has large effects on the liquidus temperature and the chemistry of crystallizing minerals. Compared to the F-free system, addition of ~2 wt.% F moves the olivine-pigeonite liquidus point down ~2 kbar and 95 °C (from 12 kbar, 1375 °C to 10 kbar, 1280 °C). With increasing fluorine concentrations, dramatically increases for both pyroxene and olivine, suggesting that fluorine in basaltic magmas complexes primarily with MgO. Complexing with MgO in the melt decreases its MgO activity, and forces the crystallizing minerals to greater Fe/Mg, and so increases . Models of basalt generation, where the magma is fluorine-rich, need to include the effect of not only water but fluorine on liquidus depression and minerals crystallizing/melting. Our results suggest that fluorine may significantly aid in the petrogenesis of silica-poor, alkali-rich magmas in the Earth and Mars.
    Description
    Author Posting. © The Author(s), 2012. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Chemical Geology 312-313 (2012): 118-126, doi:10.1016/j.chemgeo.2012.04.015.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: Filiberto, Justin, Wood, Justin, Dasgupta, Rajdeep, Shimizu, Nobumichi, Le, Loan, Treiman, Allan H., "Effect of fluorine on near-liquidus phase equilibria of an Fe–Mg rich basalt", 2012-03-26, https://doi.org/10.1016/j.chemgeo.2012.04.015, https://hdl.handle.net/1912/5302
     

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