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

Kamaleldin M. Hassan 1  and Julius Dekan 2
  • 1 Department of Radioactive Sedimentary Deposits, Research Sector, Nuclear Materials Authority, P.O. Box 530, Maadi, Cairo, Egypt
  • 2 Department of Nuclear Physics and Technology, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Bratislava Ilkovicova 3, 812 19 Bratislava, Slovakia;


Olivine basalts from southern Egypt were studied by 57Fe Mössbauer spectroscopy at 297 and 77 K, and by optical microscopy and X-ray diffraction. The 57Fe Mössbauer spectra show three-magnetic sextets, three doublets of ferrous (Fe2+), and a weak ferric (Fe3+) doublet that is attributable to a nanophase oxide (npOx). The magnetic sextets relate to titanomagnetite and the Fe2+ 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 (Fe3+/ΣFe) in the rocks varies from 20-27% with the oxidized iron largely residing in the titanomagnetite.

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