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Elastic properties and stability of coexisting 3T and 2M 1 phengite polytypes

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Abstract

The elastic properties of coexisting natural 3T and 2M 1 phengite samples (Cima Pal, Sesia Zone; Val Savenca; Western Alps, Italy) with similar chemical compositions have been studied by room temperature–high pressure powder diffraction, using synchrotron radiation on the ID9A beam-line at ESRF (Grenoble, France). The P–V curves have been modelled by the Birch–Murnaghan model; a third-order expansion fitted to the experimental data yields for 3T and 2M 1 K 0=60.4(±0.7) GPa, K′=5.79(±0.11) at V 0=703.8851 Å3, and K 0=57.3(±1.0) GPa, K′=6.97(±0.24) at V 0=938.8815 Å3, respectively. The relative stability of 3T vs. 2M 1 has been explored as a function of pressure and temperature in terms of configuration and deformation contributions to the Gibbs energy, using the elastic properties determined here and other thermodynamic parameters from earlier investigations. The results presented agree with the hypothesis of stability of the 3T polytype in the high pressure regime.

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Acknowledgements

The European Synchrotron Research Facility is acknowledged for allocating beamtime for the measurements at high pressure discussed here. The present investigation has been funded by M.I.U.R., project PRIN2004 (2004048741) ‘Study of the petrologic factors affecting micas stability’. The authors are indebted to Giovanni Ferraris, for critical reading of the manuscript before submission. F.P. Sassi and P.F. Zanazzi, who acted as referees for PCM and provided valuable suggestions which really enhanced the quality of the manuscript, are kindly acknowledged.

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Authors and Affiliations

  1. Dipartimento Scienze Mineralogiche e Petrologiche, Università degli Studi di Torino, Via Valperga Caluso 35, 10125, Turin, Italy

    Nadia Curetti, Davide Levy & Gabriella Ivaldi

  2. Consiglio Nazionale delle Ricerche, IDPA, Sezione di Milano, Via Botticelli 23, Milan, Italy

    Alessandro Pavese

  3. Dipartimento Scienze della Terra, Sezione Mineralogia, Università degli Studi di Milano, Via Botticelli 23, 20133, Milan, Italy

    Alessandro Pavese

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  1. Nadia Curetti
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  2. Davide Levy
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  3. Alessandro Pavese
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  4. Gabriella Ivaldi
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Correspondence to Alessandro Pavese.

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Curetti, N., Levy, D., Pavese, A. et al. Elastic properties and stability of coexisting 3T and 2M 1 phengite polytypes. Phys Chem Minerals 32, 670–678 (2006). https://doi.org/10.1007/s00269-005-0044-z

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  • DOI: https://doi.org/10.1007/s00269-005-0044-z

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