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Iron is a common constituent in minerals from the Earth’s crust and upper mantle and often occurs in minerals as mixtures of two valence states, Fe 3+  or Fe 2+ . Quantification of the values of Fe 3+ /Fe Total , where Fe Total  = Fe 3+ +Fe 2+ , in minerals may be necessary to accurately apply certain mineral equilibria to determine equilibrium values of important variables such as temperature (T), pressure (P), and oxygen fugacity (ƒ O₂ ). Most useful would be an analytical technique that permits determination of values of Fe 3+ /Fe Total  within a single mineral grain that is contained within a standard petrographic thin section, and the excellent spatial resolution and relative accessibility of the electron microprobe (EMP) have resulted in various attempts to use this instrument to determine values of Fe 3+ /Fe Total . These efforts have typically involved quantifying characteristics of the FeLα and/or FeLβ peaks. In this paper, we employ the method of Fialin et al. (2001), who have shown that the location of the FeLα peak changes as a function of Fe content and values of Fe 3+ / Fe Total , to determine values of Fe 3+ /Fe Total  in amphiboles.

Determination of Fe 3+ /Fe using the electron microprobe: A calibration for amphiboles