Abstract
Based on mineral assemblages and compositions in metamorphic marly rocks of the Western Hohe Tauern, the effect of Fe-Mg substitution on previously deduced phase relations in a simplified marly rock system (Hoschek 1980) is estimated. Fe-Mg partitioning in coexisting minerals is influenced, amongst others, by the F-OH substitution. Calculations with extrapolated mean K Fe-MgD values for F-free minerals and with the assumption of ideal Fe-Mg solid solution show similar effects of the Fe-Mg and the F-OH substitution on phase relations. The consideration of the Fe2+ and F distribution leads to a better compatibility between experimentally determined mineral stabilities and observed mineral assemblages in the marly rocks of the Western Hohe Tauern.
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Hoschek, G. The effect of Fe-Mg substitution on phase relations in marly rocks of the Western Hohe Tauern (Austria). Contr. Mineral. and Petrol. 75, 123–128 (1980). https://doi.org/10.1007/BF00389773
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DOI: https://doi.org/10.1007/BF00389773