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Mössbauer study of Fe phases in terrestrial olivine basalts from southern Egypt

Créateur:
KamJul
Éditeur:
Wal
Hôte:
Abstract Olivine basalts from southern Egypt were studied by 57 Fe Mössbauer spectroscopy at 297 and 77 K, and by optical microscopy and X-ray diffraction. The 57 Fe Mössbauer spectra show three-magnetic sextets, three doublets of ferrous (Fe 2+ ), and a weak ferric (Fe 3+ ) doublet that is attributable to a nanophase oxide (npOx). The magnetic sextets relate to titanomagnetite and the Fe 2+ doublets to olivine, pyroxene, and ulvöspinel. Variations in the hyperfine parameters of the various Fe components are attributed to changes in the local crystal chemistry. The intensity of oxidation (Fe 3+ /ΣFe) in the rocks varies from 20-27% with the oxidized iron largely residing in the titanomagnetite.

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http://creativecommons.org/licenses/by-nc-nd/3.0/

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