<abstract xmlns="http://www.w3.org/1999/xhtml">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.</abstract>

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.

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

Department of Radioactive Sedimentary Deposits, Research Sector, Nuclear Materials Authority, P.O. Box 530, Maadi, Cairo, Egypt

Department of Nuclear Physics and Technology, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology, Bratislava Ilkovicova 3, 812 19 Bratislava, Slovakia;

Mineralogia

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Mössbauer study of Fe phases in terrestrial olivine basalts from southern Egypt"}

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 study of Fe phases in terrestrial olivine basalts from southern Egypt

Publié en ligne: 31 juil. 2014

Pages: 3 - 12

Reçu: 04 avr. 2013

Accepté: 30 juil. 2013

DOI: https://doi.org/10.2478/mipo-2013-0001

© by Kamaleldin M. Hassan

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.