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. Author manuscript; available in PMC: 2016 Jul 19.
Published in final edited form as: Geochim Cosmochim Acta. 2016 Mar 1;176:295–315. doi: 10.1016/j.gca.2015.10.036

Fig. 3.

Fig. 3

26Al evolution diagram expressing the logarithmic 26Al/27Al ratio as a function of time after CAI-formation. Slopes correspond to −λt, where λ represents the 26Al decay constant (9.5 × 10−7 year−1) and t is time. The intercepts correspond to initial (26Al/27Al)0 ratio at the time of CAI-formation. The diagram shows the ~1.5 Myr age discrepancy between relative 26Al−26Mg ages (Schiller et al., 2010, 2015a) and absolute U-corrected Pb–Pb ages (Larsen et al., 2011) of the rapidly cooled basaltic angrite meteorite SAH 99555 when using the canonical initial (26Al/27Al)0 of 5.25 × 10−5 defined by refractory inclusions (CAIs and AOAs) in CV chondrites (Jacobsen et al., 2008; Larsen et al., 2011). This age discrepancy is eliminated when using a reduced initial (26Al/27Al)0 as defined for the angrite parent body (Larsen et al., 2011 [1.6 × 10−5]; Schiller et al., 2015a [1.3 × 10−5]). PB = Parent Body.