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3.1.4. Other Oxybarometers

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We emphasize that there are many additional, and very valuable, proxies for fO2 that are not yet widely applied to volcanics from arc, ocean island, and mid‐ocean ridge settings, but may be in the future, such as stable isotope proxies (Dauphas et al., 2009; Nebel et al., 2015; Williams et al., 2005). Similarly, microprobe peak energies (e.g., Carroll & Rutherford, 1988) and S X‐ray Absorption Near Edge Structure spectra (e.g., Fleet et al., 2005) can determine sulfur oxidation state, but analyses from both techniques can be compromised by beam damage during analysis (e.g., Klimm et al., 2012; Rowe et al., 2007; Wilke et al., 2008), leaving only a handful of vetted analyses. For these, we point the interested reader to other chapters in this volume that describe some of these approaches in detail.

Magma Redox Geochemistry

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