Some of the most important discoveries pertaining to the formation and early evolution of the Earth have come about through the measurement of short-lived radiogenic isotope systems. For example, the discovery of isotopic variations in 142Nd (146Sm → 142Nd; t½ = 103 Ma) among early-Earth samples may reflect major silicate fractionation events, such as magma ocean crystallisation and turnover, during the first several hundred million years of terrestrial evolution (e.g., Caro et al., 2003; Bennett et al., 2007; O’Neil et al., 2008). Further, the surprising difference in...

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