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Thermochemistry of monazite-(La) and dissakisite-(La): implications for monazite and allanite stability in metapelites

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Abstract

Thermochemical properties have been either measured or estimated for synthetic monazite, LaPO4, and dissakisite, CaLaMgAl2(SiO4)3OH, the Mg-equivalent of allanite. A dissakisite formation enthalpy of −6,976.5 ± 10.0 kJ mol−1 was derived from high-temperature drop-solution measurements in lead borate at 975 K. A third-law entropy value of 104.9 ± 1.6 J mol−1 K−1 was retrieved from low-temperature heat capacity (C p) measured on synthetic LaPO4 with an adiabatic calorimeter in the 30–300 K range. The C p values of lanthanum phases were measured in the 143–723 K range by differential scanning calorimetry. In this study, La(OH)3 appeared as suitable for drop solution in lead borate and represents an attractive alternative to La2O3. Pseudo-sections were calculated with the THERIAK-DOMINO software using the thermochemical data retrieved here for a simplified metapelitic composition (La = ∑REE + Y) and considering monazite and Fe-free epidotes along the dissakisite-clinozoïsite join, as the only REE-bearing minerals. Calculation shows a stability window for dissakisite-clinozoïsite epidotes (T between 250 and 550°C and P between 1 and 16 kbar), included in a wide monazite field. The P–T extension of this stability window depends on the bulk-rock Ca-content. Assuming that synthetic LaPO4 and dissakisite-(La) are good analogues of natural monazite and allanite, these results are consistent with the REE-mineralogy sequence observed in metapelites, where (1) monazite is found to be stable below 250°C, (2) around 250–450°C, depending on the pressure, allanite forms at the expense of monazite and (3) towards amphibolite conditions, monazite reappears at the expense of allanite.

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Acknowledgments

This research project was financially supported by the NOMADE programme (CEA-CNRS) and by the SNF 20020–101826/1. We are grateful to J.-M. Montel who kindly provided us with synthetic LaPO4 monazite. Assistance from J. Allaz and O. Schwarz (THERIAK-DOMINO software), N. Catel (wet chemical analyses), K.D. Grevel (HT drop-solution calorimetry), P. Kluge (DSC measurements), G. Marolleau (high-pressure devices) are gratefully acknowledged. We also thank C. Chopin and T. Parra for fruitful discussions. Constructive comments of S.V. Ushakov and an anonymous reviewer have significantly improved the quality of the manuscript and are appreciated.

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Authors and Affiliations

  1. Laboratoire de Géologie, ENS-CNRS UMR8538, 24 rue Lhomond, 75005, Paris, France

    E. Janots, F. Brunet & B. Goffé

  2. DEN/DPC/SECR, CEA, Saclay, France

    C. Poinssot

  3. Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, Bochum, Germany

    M. Burchard

  4. Institut für Geowissenschaften der Universität Kiel Olshausenstraße 40, 24098, Kiel, Germany

    L. Cemič

  5. Institute of geological sciences, University of Bern, Baltzerstrasse 3, 30012, Bern, Switzerland

    E. Janots

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Table 6 Mineral formulae and abbreviations
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Janots, E., Brunet, F., Goffé, B. et al. Thermochemistry of monazite-(La) and dissakisite-(La): implications for monazite and allanite stability in metapelites. Contrib Mineral Petrol 154, 1–14 (2007). https://doi.org/10.1007/s00410-006-0176-2

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