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Chlorine isotope homogeneity of the mantle, crust and carbonaceous chondrites

Author

Listed:
  • Z. D. Sharp

    (University of New Mexico, Albuquerque, New Mexico 87131, USA)

  • J. D. Barnes

    (University of New Mexico, Albuquerque, New Mexico 87131, USA)

  • A. J. Brearley

    (University of New Mexico, Albuquerque, New Mexico 87131, USA)

  • M. Chaussidon

    (CRPG-CNRS, BP 20, 54501 Vandoeuvre-Les-Nancy Cedex, France)

  • T. P. Fischer

    (University of New Mexico, Albuquerque, New Mexico 87131, USA)

  • V. S. Kamenetsky

    (School of Earth Sciences and CODES Centre of Excellence in Ore Deposits, University of Tasmania, Hobart, Tasmania 7001, Australia)

Abstract

Chlorine isotopes rethink Solar System prehistory may need to be rewritten following a reappraisal of the chlorine isotope content of chondritic (stony) meteorites, and samples from the Earth's crust and mantle. Large differences in the ratio between 37Cl and 35Cl in meteoritic, mantle and crustal materials have, for years, been taken as evidence for distinct reservoirs in the solar nebula, the dusty gas cloud left over after the formation of the Sun which eventually formed the Solar System planets. But the new analyses reveal that the large isotopic differences do not exist. In fact, carbonaceous chondrites, mantle and crust all have the same 37Cl/35Cl ratios. So there were no nebular reservoirs with distinct isotopic compositions, no isotopic fractionation during differentiation of the Earth and no late chlorine-bearing volatile additions to the crust.

Suggested Citation

  • Z. D. Sharp & J. D. Barnes & A. J. Brearley & M. Chaussidon & T. P. Fischer & V. S. Kamenetsky, 2007. "Chlorine isotope homogeneity of the mantle, crust and carbonaceous chondrites," Nature, Nature, vol. 446(7139), pages 1062-1065, April.
    • Handle: RePEc:nat:nature:v:446:y:2007:i:7139:d:10.1038_nature05748
    DOI: 10.1038/nature05748
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