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![[Figure 3]](rv9123fig3mag.jpg)
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Figure 3
Demonstration of iterative energy calibration correction. (a) A MORB glass spectra (Smithsonian Institute sample number VG 3450), as collected by Berry et al. (2018  ) (orange dot–dashed line), iteratively self-corrected (solid black line) to the basaltic glass standards. Also shown for reference are the spectra for the 0.011 and 0.775 Fe3+/ΣFe ratio standards (black dotted lines). The Fe3+/ΣFe ratio (inset) for Method A (solid orange lines) and B (dashed blue lines) as a function of iteration number shows convergence to a single Fe3+/ΣFe ratio. Similar treatment is shown for the RGM-2 reference standard (b) and an experimental section of pumice from the 2012 Havre eruption (c), both iteratively self-corrected to the rhyolite glass standards (Cottrell et al., 2009). Also shown for reference are the spectra for the 0.238 and 0.806 Fe3+/ΣFe ratio standards (black dotted lines). The vertical dashed lines in (a)–(c) refer to the two points E1 and E2 in each case. |
![[Figure 3]](rv9123fig3.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
