The effect of Fe-Mg substitution on phase relations in marly rocks of the Western Hohe Tauern (Austria) |
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| Authors: | G Hoschek |
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| Institution: | (1) Mineralogisch-Petrographisches Institut, Universitätsstraße 4, A-6020 Innsbruck, Austria |
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| 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
D
Fe-Mg
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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