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Thermodynamic Evaluation of Fe Effect on Alumina Solubility in Orthopyroxene coexisting with Garnet  

Lee, Han-Yeang (Korea Institute of Geosciences and Mineral Resources (KIGAM))
Publication Information
Journal of the Korean earth science society / v.25, no.1, 2004 , pp. 39-47 More about this Journal
Abstract
In the FMAS system the effect of iron on alumina solubility in orthopyroxene has been determined by experiments with crystalline starting mixtures of garnet and orthopyroxene of known initial compositions at 20 kb, 975$^{\circ}C$ and 25 kb, 1,200$^{\circ}C$. These data have been modeled to develop a thermodynamic method for the calculation of Al$_{2}$O$_{3}$ in orthopyroxene as a function of P, T and composition. The direct application of the alumina solubility data in the MAS system to natural assemblages could lead to significant overestimation of pressure, probably by about 5kb for the relatively common garnet-lherzolites with abot 25 mol per cent Ca + Fe$^{2+}$ in garnet and about 1 wt. per cent Al$_{2}$O$_{3}$ in orthopyroxene since the effect of Fe is similar to that of Ca and Cr$^{3+}$in reducing the alumina solubility in orthopyroxene in equilibrum with garnet relative to that in the MAS system.
Keywords
Alumina solubility; Iron; Orthopyroxene; Garnet; FMAS system;
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