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February 5, 2026

Water content and iron oxidation state analysis of silicate glass using the electron probe

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Techniques measure water content and iron oxidation state in silicate glass, indicating magma conditions.

This study aims to measure water content and iron oxidation state in silicate glass using electron probe techniques.
Utilized electron probe microanalysis (EPMA) to quantify H2O and Fe3+/FeT.
Applied calibrated volatiles-by-difference technique for H2O analysis.
Employed time-dependent-ratio flank method for Fe3+/FeT quantification.
Tested techniques on basaltic and peralkaline rhyolitic glasses.
Achieved H2O quantification with spatial resolution of 5-10 μm and uncertainty of ±0.5-0.7 wt%.
Quantified Fe3+/FeT with spatial resolution of 20-60 μm and uncertainty of ±0.1.
EPMA showed higher resolution for H2O compared to other techniques, but lower for Fe3+/FeT.

Hughes et al. (2026) studied this question.

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