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. Author manuscript; available in PMC: 2020 Apr 3.
Published in final edited form as: Geochim Cosmochim Acta. 2019 Jun 22;260:133–160. doi: 10.1016/j.gca.2019.06.023

Fig 5.

Fig 5.

Plagioclase Al/Mg comparisons of regions analyzed by EPMA and by SIMS. Al/Mg ratios by SIMS are calculated by multiplying the measured 27Al/24Mg by the fraction of Mg measured as 24Mg. EPMA uncertainties represent the maxima of (1) the range of values per region analyzed (1 to 5 EPMA measurements were collected per spot analyzed by SIMS); or (2) the uncertainties of Al and Mg from measurements of plagioclase standards as unknowns (Table 1). SIMS uncertainties are the 27Al/24Mg values given in Table 2, and are smaller than the symbols.