Figure 8.

The U isotope compositions (expressed as δ^238/235U) versus the mass-dependent Mg isotopic compositions of CAIs. The U isotopic compositions are from Brennecka et al. (2010) and are corrected for the updated U isotope composition of the SRM950a standard (Richter et al., 2010). The dotted red line is a regression through the igneous CAIs only, whereas the grey dotted line is a theoretical Rayleigh fractionation line. Uncertainties are shown as the 2SD of repeat analyses of the terrestrial standard and are smaller than the symbol when not visible.