Nanometer-scale measurements of iron oxidation states of cronstedtite from primitive meteorites

Thomas J. Zega, Laurence Garvie, P R Buseck

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45 Scopus citations


We report the first nanometer-scale measurements of the iron (III) to total iron (Fe3+/ΣFe) ratios from primitive meteorites. These ratios from the matrices and fine-grained rims (FGRs) of the Murchison, Murray, and Cold Bokkeveld CM chondrites fall within a tight range, from 0.45 to 0.54 (±0.02). The measurements were made using electron energy-loss spectroscopy (EELS) on cronstedtite, which is a product of aqueous alteration early in the history of the solar system. The results indicate that the alteration of these meteorites, which display a broad range of alteration intensity, occurred under similar redox conditions and, further, that alteration likely occurred in situ on asteroidal bodies rather than in the solar nebula.

Original languageEnglish (US)
Pages (from-to)1169-1172
Number of pages4
JournalAmerican Mineralogist
Issue number7
StatePublished - Jul 2003

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology


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