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142Nd evidence for an enriched Hadean reservoir in cratonic roots

Author

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  • Dewashish Upadhyay

    (Zentrallabor für Geochronologie, Institut für Mineralogie, Universität Münster, Corrensstrasse 24, 48149 Münster, Germany)

  • Erik E. Scherer

    (Zentrallabor für Geochronologie, Institut für Mineralogie, Universität Münster, Corrensstrasse 24, 48149 Münster, Germany)

  • Klaus Mezger

    (Zentrallabor für Geochronologie, Institut für Mineralogie, Universität Münster, Corrensstrasse 24, 48149 Münster, Germany)

Abstract

An enriched Hadean reservoir The isotopic decay of samarium-146 produces neodymium-142, with a half-life of 103 million years. Major geochemical differentiation events such as the formation and crystallization of a magma ocean or the extraction of the first crust early in planetary history can fractionate samarium (Sm) from neodymium (Nd) and produce reservoirs having contrasting 142Nd/144Nd compositions that provide a sensitive monitor of the main silicate differentiation events that took place in the early Earth. Upadhyay et al. have measured low 142Nd/144Nd ratios in ∼1.48 billion-year-old rocks from the Khariar complex in southeastern India. This indicates that enriched Hadean reservoirs may be hidden within the roots of old cratons.

Suggested Citation

  • Dewashish Upadhyay & Erik E. Scherer & Klaus Mezger, 2009. "142Nd evidence for an enriched Hadean reservoir in cratonic roots," Nature, Nature, vol. 459(7250), pages 1118-1121, June.
    • Handle: RePEc:nat:nature:v:459:y:2009:i:7250:d:10.1038_nature08089
    DOI: 10.1038/nature08089
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