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. 2008 Sep 26;321(5897):1828-31.
doi: 10.1126/science.1161925.

Neodymium-142 evidence for Hadean mafic crust

Jonathan O'Neil  1 , Richard W Carlson, Don Francis, Ross K Stevenson
Affiliations

Neodymium-142 evidence for Hadean mafic crust

Jonathan O'Neil et al. Science. .

Abstract

Neodymium-142 data for rocks from the Nuvvuagittuq greenstone belt in northern Quebec, Canada, show that some rock types have lower 142Nd/144Nd ratios than the terrestrial standard (epsilon142Nd = -0.07 to -0.15). Within a mafic amphibolite unit, 142Nd/144Nd ratios correlate positively with Sm/Nd ratios and produce a 146Sm-142Nd isochron with an age of 4280(-81)(+53) million years. These rocks thus sample incompatible-element-enriched material formed shortly after Earth formation and may represent the oldest preserved crustal section on Earth.

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