The effects of temperature and pressure on the oxidation state of chromium in silicate melts
The oxidation state of Cr, Cr /ΣCr (where ΣCr = Cr + Cr = 0.35 wt%), in Fe-free silicate glasses quenched from melts equilibrated as a function of pressure to 3.5 GPa at 1500 °C, and as a function of temperature to 1500 °C at atmospheric pressure, and at oxygen fugacities (fO , in log units relative to the quartz-fayalite-magnetite (QFM) buffer) between ∆QFM = − 1 and − 2, was determined by XANES spectroscopy. Increasing temperature stabilises Cr and increasing pressure stabilises Cr . A...[Show more]
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|Source:||Contributions to Mineralogy and Petrology|
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