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Valences and site characteristics of iron in radioactive magmatic veins (Egypt): A Mössbauer and chemical study

Kamaledin Hassan
  • Nuclear Materials Authority, P.O. Box 530, Maddi, Cairo, Egypt
Published Online: 2011-02-23 | DOI: https://doi.org/10.2478/v10002-010-0003-2

Valences and site characteristics of iron in radioactive magmatic veins (Egypt): A Mössbauer and chemical study

Radioactive veins in shear zones of the El-Seboah granite in Egypt with anomalous concentrations of Nd, Ce, Zr, Y, Nb, Sm, Th and U were studied by petrographic microscopy, x-ray diffraction, 57Fe Mössbauer and wet chemical methods. The veins are composed essentially of quartz, aegirine-augite and minor K-feldspar ± α-iron oxide (hematite) ± γ-iron oxide hydroxide (goethite). They likely represent late-stage felsic melt that was quenched and devitrified at high temperature to yield crystals and crystallites, and then subjected to low temperature alteration during which most of the K feldspar transformed to kaolinite and opal. Mössbauer parameters of the samples indicate that the existing Fe-bearing minerals are primary, with appreciable ordering in the Fe sites. The bulk-sample iron (ΣFe) contents are extremely high (12.3-22.4%). The extent of oxidation of the Fe has been found to be 100% by Mössbauer spectroscopy and 95.36-99.69% by a chemical method. These conditions of Fe enrichment and strong oxidation suggest that the veins are extreme differentiates of granite magmas where high states of oxygen fugacity prevailed.

Keywords: Egypt; Mössbauer; peralkaline rocks; aegirine-augite; Fe-oxide phases; radioactive/rare metals

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About the article

Published Online: 2011-02-23

Published in Print: 2010-01-01

Citation Information: Mineralogia, ISSN (Online) 1899-8526, ISSN (Print) 1899-8291, DOI: https://doi.org/10.2478/v10002-010-0003-2. Export Citation

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