Partitioning of platinum-group elements and Au in the Fe-Ni-Cu-S system: experiments on the fractional crystallization of sulfide melt - a discussion

Article Abstract:

Fractional crystallization is responsible for partitioning platinum-group elements (PGE) and Au between the sulphide liquid and the monosulphide solid solution. The use of sulphide ores from komatiite deposits to disprove the association of massive and disseminated ores by fractional crystallization is incorrect. The Cu content of disseminated ores is not zero and the fractional crystallization model has not been applied to these ores. The partitioning of PGE and Cu in the Alexo, Ontario, and Lunnon Shoot, Kambalda agrees with the predictions of the crystallization model.

Analysis, Evaluation, Ores, Sulfides, Crystallization, Komatiite

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Systematics of calcium partitioning between olivine and silicate melt: implications for melt structure and calcium content of magmatic olivines

Article Abstract:

Research was conducted to prove how experimental studies of compositionally simple systems decrease the number of self correlated variables, which, in turn, allow the characterization of individual factors that control Ca partitioning and the development of a quantitative model for such partitioning. The experiments were carried out on compositionally simple systems over a wide range of temperature at one bar pressure. Results indicate that Cao concentration of olivine is strongly sensitive to the amount of alumina, alkali and ferrous iron present in the coexisting melt.

Calcium, Calcium (Chemical element), Olivine, Silicate minerals, Magmatism

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Compositional dependence of REE partitioning between diopside and melt at 1 atmosphere

Article Abstract:

The effects of composition on pyroxene-melt partitioning of rare earth elements yttrium and strontium were investigated. Coexisting mineral-liquid pairs were synthesized by the vertical gradient freeze method. Experimental results showed that the prevailing convention flows are increased by rotational motion around the longitudinal axis of the crucible. The crystallized diopsides occur as both large symplectitic lamellar intergrowths with anorthite or titanite and euhedral single crystals. Quenching is attained by dropping the crucible into water.

Yttrium, Rare earth metals, Minerals, Minerals (Geology), Strontium

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