142Nd evidence for an enriched Hadean reservoir in cratonic roots

Dewashish Upadhyay (), Erik E. Scherer and Klaus Mezger
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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

Nature, 2009, vol. 459, issue 7250, 1118-1121

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.

Date: 2009
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DOI: 10.1038/nature08089

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