"Henry's law" behaviour of Sm in a natural plagioclase/melt system: Importance of experimental procedure

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We report an experimental study of the partitioning of Sm in a natural plagioclase/melt system as a function of concentration of Sm at constant pressure, temperature and bulk composition. Both radioactive 151 Sm and non-radioactive Sm 2 O 3 were used. In experiments in which the sample was initially held at a temperature above the liquidus for only one hour, we find that the plagioclase/ melt partition coefficient for Sm increases with decreasing concentration of Sm. There is also evidence for isotopic heterogeneity in the initially molten charge. In experiments in which the sample was initially held at the same temperature above the liquidus for 24 hours, the partition coefficient was constant as a function of concentration and no evidence for isotopic heterogeneity was observed. These experiments indicate that partition coefficients obtained from experiments involving tracer isotopes are very sensitive to experimental procedure. Our experiments also indicate that the partition coefficient for Sm between plagioclase and melt is constant over the range 3 to 50,000 ppm Sm in the melt. That range encompasses most concentrations in natural systems.

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