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A highly unradiogenic lead isotopic signature revealed by volcanic rocks from the East Pacific Rise

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  • Berengere Mougel

    (Laboratoire Domaines Océaniques, UMR6538, IUEM)

  • Arnaud Agranier

    (Laboratoire Domaines Océaniques, UMR6538, IUEM)

  • Christophe Hemond

    (Laboratoire Domaines Océaniques, UMR6538, IUEM)

  • Pascal Gente

    (Laboratoire Domaines Océaniques, UMR6538, IUEM)

Abstract

Radiogenic isotopes in oceanic basalts provide a window into the different geochemical components defining the composition of Earth’s mantle. Here we report the discovery of a novel geochemical signature in volcanic glasses sampled at a sub-kilometre scale along the East Pacific Rise between 15°37′N and 15°47′N. The most striking aspect of this signature is its unradiogenic lead (206Pb/204Pb=17.49, 207Pb/204Pb=15.46 and 208Pb/204Pb=36.83). In conjunction with enriched Sr, Nd and Hf signatures, Pb isotopes depict mixing lines that trend away from any known mantle end-members. We suggest that this unradiogenic lead component sampled by magmatic melts corresponds to a novel upper mantle reservoir that should be considered in the Pb isotope budget of the bulk silicate Earth. Major, trace element and isotope compositions are suggestive of an ancient and lower continental origin for this unradiogenic lead component, possibly sulphide-bearing pyroxenites that were preserved even after prolonged stirring within the ambient upper mantle.

Suggested Citation

  • Berengere Mougel & Arnaud Agranier & Christophe Hemond & Pascal Gente, 2014. "A highly unradiogenic lead isotopic signature revealed by volcanic rocks from the East Pacific Rise," Nature Communications, Nature, vol. 5(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5474
    DOI: 10.1038/ncomms5474
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