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Local heterogeneity in the distribution of iron ions in CR-spinel from Ural ultramafic massifs: Evidence from Mössbauer spectroscopy data

  • Methods of Research of Minerals, Rocks, and Ores
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Abstract

The crystal chemistry of Fe ions in Cr-spinel from the largest Ural ultramafic massifs has been studied by Mössbauer spectroscopy at room temperature and the boiling temperature of liquid nitrogen. The spectra substantially depend on the mineral composition (stoichiometry) and measurement temperature; Fe2+ and Fe3+ doublets significantly overlap; the Fe2+ doublet lines are markedly broadened. According to the Mössbauer data, the degree of iron oxidation is 7–35% and appreciably differs from that in the stoichiometric approximation. The disturbance of integral stoichiometry by di- and trivalent cations (deviation of the Me3+/Me2+ value from 2.0) may be caused not only by partial inversion of the mineral structure but also by local micro- and nanoscale heterogeneity of the mineral, clustering of Fe2+ and Al (Cr, Fe3+) cations, and the appearance of associates. Possible application of the QS-distribution method for analyzing nonequivalent nuclear iron states and the thermal dynamics of Mössbauer spectra for studying local clustering effects of iron cations is discussed. It is shown that these approaches give new information on local heterogeneity of structural sites occupied by iron ions.

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Authors and Affiliations

  1. Institute of Geology and Geochemistry, Ural Division, Russian Academy of Sciences, Pochtovyi per. 7, Yekaterinburg, 620151, Russia

    S. L. Votyakov, V. P. Suetin & I. S. Chashchukhin

  2. Institute of Geology, Komi Scientific Center, Ural Division, Russian Academy of Sciences, ul. Pervomaiskaya 54, Syktyvkar, 167982, Russia

    V. P. Lyutoev & A. Yu. Lysyuk

  3. Institute of Mineralogy, Ural Division, Russian Academy of Sciences, Miass, Chelyabinsk oblast, 456317, Russia

    A. B. Mironov

Authors
  1. S. L. Votyakov
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  2. V. P. Suetin
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  3. V. P. Lyutoev
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  4. A. Yu. Lysyuk
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  5. A. B. Mironov
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  6. I. S. Chashchukhin
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Correspondence to S. L. Votyakov.

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Original Russian Text © S.L. Votyakov, V.P. Suetin, V.P. Lyutoev, A.Yu. Lysyuk, A.B. Mironov, I.S. Chashchukhin, 2009, published in Zapiski RMO (Proceedings of the Russian Mineralogical Society), 2009, No. 2, pp. 92–105.

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Votyakov, S.L., Suetin, V.P., Lyutoev, V.P. et al. Local heterogeneity in the distribution of iron ions in CR-spinel from Ural ultramafic massifs: Evidence from Mössbauer spectroscopy data. Geol. Ore Deposits 52, 669–678 (2010). https://doi.org/10.1134/S1075701510070202

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  • DOI: https://doi.org/10.1134/S1075701510070202

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