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, S24b7 and S25b10) using 176
, Considering the upper uncertainty of the zircon average ?Hf value (-1.35±0.22), it is not possible to account for the initial Hf isotope composition of these grains if they formed from the reworking of a basaltic crust since extraction ages older than the Solar System are required, Lu/ 177 Hf ratios of 0.020 and 0.011 for the basaltic and andesitic crusts, respectively23,25
, Lu/ 177 Hf ratios of 0.011 yields an extraction age of 4562 ?15 +5
Note that the time evolution of this reservoir can account for the Hf isotope composition of the younger ~4450 Ma and ~4430 Ma zircons. Indeed, a regression of the mean of the ~4475 Ma, ~4450 Ma and ~4430 Ma zircons yields a slope corresponding to an andesite-like ,
Uncertainty on the ?Hf values reflect the internal precision (2SE) or the external reproducibility of 22 ppm ,