Neodymium-142 evidence for Hadean mafic crust - PubMed (original) (raw)

. 2008 Sep 26;321(5897):1828-31.

doi: 10.1126/science.1161925.

Affiliations

• PMID: 18818357
• DOI: 10.1126/science.1161925

Neodymium-142 evidence for Hadean mafic crust

Jonathan O'Neil et al. Science. 2008.

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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Comment in

• Geochemistry. Geologists find vestige of early Earth--maybe world's oldest rock.
  Kerr RA. Kerr RA. Science. 2008 Sep 26;321(5897):1755. doi: 10.1126/science.321.5897.1755a. Science. 2008. PMID: 18818329 No abstract available.
• Comment on "Neodymium-142 evidence for Hadean mafic crust".
  Andreasen R, Sharma M. Andreasen R, et al. Science. 2009 Jul 17;325(5938):267; author reply 267. doi: 10.1126/science.1169604. Science. 2009. PMID: 19608899

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