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American Mineralogist; July 2003; v. 88; no. 7; p. 1169-1172
© 2003 Mineralogical Society of America
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Letter

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

Thomas J. Zega1,*, Laurence A. J. Garvie1 and Peter R. Buseck1,2

1 Department of Geological Sciences, Arizona State University, Tempe, Arizona 85287-1404, U.S.A
2 Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, U.S.A.

Correspondence: * E-mail: tzega{at}asu.edu

We report the first nanometer-scale measurements of the iron (III) to total iron (Fe3+/{sum}Fe) 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.




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L. A. J. Garvie, T. J. Zega, P. Rez, and P. R. Buseck
Nanometer-scale measurements of Fe3+/{Sigma}Fe by electron energy-loss spectroscopy: A cautionary note
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L. A. J. Gravie, L. A.J. Garvie, and P. R. Buseck
Unoccupied states of pyrite probed by electron energy-loss spectroscopy (EELS)
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