Abstract
High spatial resolution analysis of the iron oxidation state in silicate glasses using the electron probe
Highlights
Oxygen fugacity is an important control on the chemical and physical properties of silicate melts, the stability of magmatic phases, and the multiphase rheology of magmas (e.g., Hamilton et al 1964; Dingwell and Virgo 1987; Kress and Carmichael 1991; Vicenzi et al 1994; Bouhifd et al 2004; Wilke 2005)
Raman spectroscopy has a high spatial resolution (1 μm diameter), but has lower sensitivity for basaltic compositions and problems related to background fluorescence
For a given chemical system, the FeLα and FeLβ peak positions and intensities vary depending on Fe concentration, oxidation state, and coordination (Fig. 1b; Hofer and Brey 2007)
Summary
Oxygen fugacity is an important control on the chemical and physical properties of silicate melts, the stability of magmatic phases, and the multiphase rheology of magmas (e.g., Hamilton et al 1964; Dingwell and Virgo 1987; Kress and Carmichael 1991; Vicenzi et al 1994; Bouhifd et al 2004; Wilke 2005). For a given chemical system (e.g., garnet, olivine, silicate glass), the FeLα and FeLβ peak positions and intensities vary depending on Fe concentration, oxidation state, and coordination (Fig. 1b; Hofer and Brey 2007). The flank method uses changes in the wavelength and intensity of both the FeLα and FeLβ peaks by measuring the intensity ratio of positions on the low-wavelength flank of FeLα (FeLαf) and high-wavelength flank of FeLβ (FeLβf), termed FeLβf/FeLαf (Hofer et al 1994; Hofer 2002; Hofer and Brey 2007) (Fig. 1b) These flank positions coincide with the L2 and L3 absorption edges and, as the Fe2+ content changes, the L3 absorption edge shifts.
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