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An experimental determination of the effect of pressure on the Fe3+/ΣFe ratio of an anhydrous silicate melt to 3.0 GPa
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Hugh St.C. O'Neill
,
Andrew J. Berry
Published/Copyright:
March 31, 2015
Abstract
The effect of pressure on the Fe3+/ΣFe ratio of an anhydrous andesitic melt was determined from 0.4 to 3.0 GPa at 1400 °C with oxygen fugacity controlled internally by the Ru + RuO2 buffer. Values of Fe3+/ΣFe were determined by Mössbauer spectroscopy on quenched glasses with a precision of ±0.01, one standard deviation. This precision was verified independently by XANES spectroscopy of the same samples. The XANES spectra show a systematic increase in energy and decrease in intensity of the 1s → 3d transition with increasing pressure. The results to 2.0 GPa are in good agreement with predictions from density and compressibility measurements fitted to a Murnaghan equation of state, but the datum at 3.0 GPa has higher Fe3+/ΣFe than predicted from the trend established by the lowerpressure data. This might be due to a coordination change in Fe3+ at high pressure; although there is no evidence for this in the Mössbauer spectra, such a change could account for the change in intensity of the 1s → 3d transition in the XANES spectra with pressure.
Received: 2005-2-24
Accepted: 2005-9-5
Published Online: 2015-3-31
Published in Print: 2006-2-1
© 2015 by Walter de Gruyter Berlin/Boston
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