Experimentally determined mineral-melt partition coefficients for Sc, Y and REE for olivine, orthopyroxene, pigeonite, magnetite and ilmenite

Article Abstract:

The different experiments on natural composition lavas have characterized the functional behavior of the trivalent cations scandium (Sc), yttrium and the rare earth elements. The application of a mineral-melt expression, which follows an exchange reaction scheme, results in the calculation of a compositionally independent term that represents the pyroxene-melt partitioning behavior for various minerals. Moreover, Sc features a partitioning behavior that is dependent on melt composition and temperature.

Analysis, Yttrium, Lava, Magnetite

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Partitioning of Fe and Mn between ilmenite and olivine at 1100 degrees Celsius: constraints on the thermodynamic mixing properties of (Fe, Mn)TiO3 ilmenite solid solutions

Article Abstract:

The partitioning of Fe2+ and Mn2+ between (Fe, Mn)TiO3 and (Fe, Mn)2SiO4 solid solutions in the system FeO-MnO-TiO2-SiO2 was investigated at 1100 degrees Celsius and pressures of one bar and 25 kilobars. The Fe-Mn partitioning results constrain the difference in the thermodynamic mixing characteristics of the solid solutions. These findings confirm the hypothesis that solid solutions between isostructural end-members have simple thermodynamic mixing properties.

Manganese, Manganese (Metal), Isotopes, Iron, Iron (Metal), Thermodynamics, Ionic solutions

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An experimental study of Fe-Mg partitioning between olivine and orthopyroxene at 1173, 1273 and 1423 K and 1.6 GPa

Article Abstract:

Iron-magnesium (Fe-Mg) partitioning between coexisting olivines and orthopyroxes was determined in a recent study, the results of which were compared with previous experimental studies. The experiments were conducted over a wide range of Fe/Mg ratios at 1173, 1273 and 1423 Kelvin at 1.6 GPa. The results indicate that the distribution coefficient (KD) is composition and temperature-dependent, but at mantle compositions KD becomes insensitive to temperature.

Methods, Analytic geochemistry

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