Technical Comments

Response to Comment on “Neodymium-142 Evidence for Hadean Mafic Crust”

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Science  17 Jul 2009:
Vol. 325, Issue 5938, pp. 267
DOI: 10.1126/science.1169695

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Andreasen and Sharma raise concerns about the neodymium-142 data and age that we reported for rocks from the Nuvvuagittuq greenstone belt in Quebec, Canada. We agree that the issue of accurate mass fractionation correction is important, but stand by our discussion of this issue in our original report and our conclusion that the variation in 142Nd/144Nd ratios reflects the decay of 146Sm caused by Sm-Nd fractionation within 300 million years of Earth’s formation.

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