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. Author manuscript; available in PMC: 2021 Jan 15.
Published in final edited form as: Geochim Cosmochim Acta. 2020 Jan 15;269:639–660. doi: 10.1016/j.gca.2019.10.042

Figure 8.

Figure 8.

Magnesium isotopic compositions of individual minerals from the Vigarano CAI Big Guy. The data are plotted on diagrams of Δ26Mg* vs. 27Al/24Mg. (a) Multicollection data of hibonite, spinel, and diopside. Regression through the data yields a slope corresponding to (26Al/27Al)0 = (4.94 ± 0.12) × 10−5 (χ2 = 1.8) and an intercept of Δ26Mg0* = 0.09 ± 0.04‰ (errors are 2σ). (b) Monocollection data of melilite from the CAI mantle. Most of the melilite data points are plotted along with the high-precision isochron having (26Al/27Al)0 = 4.9 × 10−5.