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High spatial resolution electron probe analysis of H2O-bearing aluminosilicate glassesстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Tu C., Gao X-Y, Safonov O.G., Xiao T-T, Yapaskurt V.O., Lia W-C
- Журнал: Journal of Analytical Atomic Spectrometry
- Том: 10
- Номер: 1039
- Год издания: 2025
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- DOI: 10.1039/d5ja00248f
- Аннотация: Accuracy of the in situ major element analysis of silicate glasses is critical for insights into magmaticevolution, anatectic processes, and melt–fluid interactions. Electron probe microanalysis (EPMA),a widely used technique for microanalysis, faces limitations due to alkali ion migration (particularly Na+and K+) under high current densities typical of micron-beam spots. Furthermore, the correctionprocedures are constrained by standard availability and reference data. This study addresses thesechallenges by analyzing a suite of H2O-bearing aluminosilicate glass standards using a JEOL JXA-8530FEPMA under the optimized conditions of 1 mm beam spot size, 15 kV accelerating voltage, 1–5 nA beamcurrents, and counting times of 10 s on peak and 5 s on background. Our results demonstrated thatNa2O loss correlated linearly with both current intensity and H2O content, exhibiting consistentproportionality across varying water contents and current conditions. In contrast, K2O loss exhibiteda threshold-dependent behavior, exhibiting a significant loss ($5% loss) only in glasses with $4 wt% H2Oor under higher beam currents ($3 nA). Notably, Na+ migration occurred more readily than K+ migrationunder identical analytical conditions. The observed alkali depletion was accompanied by an increase inAl2O3 and SiO2 concentrations. These findings indicate that alkali mobility is controlled by both externalfactors (beam parameters) and internal conditions (specifically, glass composition, with volatile contentplaying a particularly important role). To minimize the impact of measurement variablility, we developeda correction protocol utilizing standard-derived calibration factors based on measured, analyzed andknown concentration ratios. We recommended optimal analytical conditions (1 mm spot beam and 3–4nA current) combined with matrix-matched H2O-bearing standards. This methodology maintains thesuperior spatial resolution of EPMA while significantly improving the analytical accuracy of H2O-bearingglasses. This approach is especially advantageous for analyzing minute melt inclusions in minerals andexperimental melt quench products.
- Добавил в систему: Сафонов Олег Геннадьевич
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