Abstract
Ferric iron solid solution in synthetic orthopyroxene has been studied along the joins MgSiO 3-Al 2O 3 · Fe 2O 3 and MgSiO 3-Fe 2O 3. The partially reduced synthetic orthopyroxenes showed that major incorporation of ferric iron can only occur together with a concomitant incorporation of Al. Maximum solid solution of ferric iron along the join MgSiO 3-Fe 2O 3 was found to be only 0.63 wt% Fe 2O 3 at 1000°C and 2 kb total pressure. From the observed Mössbauer parameters octahedral ferric iron can be assigned to the MI position in orthopyroxene. Incorporation of Fe 3+ and/or Al will increase the disorder of Fe 2+ and Mg between the M1 and M2 sites, which is also observed in a ferric iron-containing aluminous orthopyroxene of metamorphic origin. In the assemblage orthopyroxene + sillimanite + quartz the ferric iron content of orthopyroxene is directly related to oxygen fugacity.
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