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Red micas from basal ignimbrites of Mt. Vulture (Italy): interlayer content appraisal by a multi-methodic approach

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Abstract

The crystal chemistry of red phlogopites from Mt. Vulture (Italy) ignimbrites has been studied by electron microprobe, secondary ion mass spectrometry (SIMS), single crystal structural investigation and Fourier transform infrared (FTIR) spectroscopy. The analysed phlogopite has Fe/(Fe + Mg) ∼ 0.35, TiO2 (wt%): 2.8–5.0 and H2O (wt%): 1.24–3.37. Infrared spectra revealed the presence of bands due to the NH +4 and H2O stretching and bending vibrations. The samples belong to the 1M polytype. The bimodal behaviour of several structural parameters allows red micas to be clustered into two distinct groups: K+ ↔ NH +4 , H2O and M3+-vacancy substitutions dominate in the first group; M3+,4+-oxy, in the second group. It has to be pointed out that quantitative analysis of hydrogen (via SIMS) together with the characterization of the local environment of the anionic site (via FTIR) are fundamental in assessing the correct structural formula and the substitution mechanisms in micas.

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Acknowledgments

The authors are grateful to Mr. Marcello Serracino for assistance during electron probe microanalyses at the Istituto di Geologia Ambientale e Geoingegneria, CNR, Rome. This work was supported by the Italian Ministry for University and Research (MUR).

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Authors and Affiliations

  1. Dipartimento Geomineralogico, Università degli Studi di Bari, Via E. Orabona 4, 70125, Bari, Italy

    Fernando Scordari, Emanuela Schingaro, Gennaro Ventruti & Maria Lacalamita

  2. CNR-Istituto di Geoscienze e Georisorse (IGG), Sezione di Pavia, Via Ferrata, 1, 27100, Pavia, Italy

    Luisa Ottolini

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  1. Fernando Scordari
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  2. Emanuela Schingaro
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  3. Gennaro Ventruti
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  4. Maria Lacalamita
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  5. Luisa Ottolini
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Correspondence to Fernando Scordari.

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Fo–Fc comparison for the analysed samples (ESM1 DOC 456 kb)

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Scordari, F., Schingaro, E., Ventruti, G. et al. Red micas from basal ignimbrites of Mt. Vulture (Italy): interlayer content appraisal by a multi-methodic approach. Phys Chem Minerals 35, 163–174 (2008). https://doi.org/10.1007/s00269-007-0208-0

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