Nanometer-scale measurements of iron oxidation states of cronstedtite from primitive meteorites
2003; Mineralogical Society of America; Volume: 88; Issue: 7 Linguagem: Inglês
10.2138/am-2003-0726
ISSN1945-3027
AutoresT. J. Zega, L. A. J. Garvie, Peter R. Buseck,
Tópico(s)Stellar, planetary, and galactic studies
ResumoWe 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.
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