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Sm-Nd isochron diagrams for 77215. Data measured here for 77215 are shown by filled squares along with the data for other Mg-suite whole rocks (filled circles). The open circles are the data from Nakamura et al. [26] that are as reported in that study after refractionation correction to 146Nd/144Nd=0.7219. The inset to part (a) shows the deviation of the individual points, in parts in 10 000 from the 77215 internal isochron.
