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Octahedral cation partitioning in Mg,Fe²⁺-olivine. Mössbauer spectroscopic study of synthetic (Mg_0.5 Fe²⁺_0.5)₂SiO₄ (Fa₅₀)

¹ Division of Mineralogy and Material Sciences, University of Salzburg, Hellbrunnerstr., 34, A-5020, Salzburg, Austria
² Institute of Mineralogy, University of Münster, Corrensstr. 24, D-48149 Münster, Germany
³ Department of Mineralogy, Crystallography and Petrology, St. Petersburg Mining Institute (Technical University), 21^st line 2, 199106 St. Petersburg, Russia

^* E-mail: michael{at}mvm.usr.spmi.spb.ru.

The high-temperature partitioning of Fe²⁺ and Mg between the two non-equivalent octahedral M1 and M2 sites in synthetic olivine (Fa₅₀) was studied by Mössbauer spectroscopy. Powder samples have been equilibrated in annealing experiments performed under reducing oxygen fugacity at temperatures between 500°C and 800°C followed by rapid quenching in order to prevent redistribution of cations. M-site ordering with Fe²⁺ preferring M1, Mg preferring M2 sites increases continuously with rising equilibrium temperature. K_D values increase from 1.21 at 500°C to 1.48 at 750°C. The results are consistent with both room temperature as well as in situ high temperature single crystal X-ray diffraction experiments of Heinemann et al. (2003a and b).

Key-words: olivine, structural disorder, Mössbauer spectroscopy, high-temperature cation partitioning.

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