The paragonite-muscovite solvus: I. P-T-X limits derived from the Na-K compositions of natural, quasibinary paragonite-muscovite pairs

Details The paragonite-muscovite solvus: I. P-T-X limits derived from the Na-K compositions of natural, quasibinary paragonite-muscovite pairs The paragonite-muscovite solvus: I. P-T-X limits derived from the Na-K compositions of natural, quasibinary paragonite-muscovite pairs

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.2269g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 10, pp.2269-2275

Computer Science

1

Scientific paper

Data on the Na-K compositions and final equilibration temperatures of natural, quasibinary paragonite-muscovite (Pg-Ms) pairs (mole fraction of margarite in Pg < 0.05; Si/formula unit 6.2 and/or (Mg + Fe 2+ + Fe 3+ ) 0.35 for Ms) have been plotted and analyzed to determine the P - T - X limits of the binary Pg-Ms solvus. There is considerable scatter in the data, but the T - X morphology of the solvus is clearly discernible. Scatter in the data can be attributed to numerous potential sources of error, including (1) inaccuracies in determinations of the Na-K compositions of the coexisting micas, (2) H 3 O + K + and vacancy K + substitution in Ms and/or Pg, and (3) crystallization and preservation of quasibinary Pg-Ms pairs with metastable Na-K compositions. Data on the Na-K compositions of both Pg and Ms are available for twenty-eight of the Pg-Ms pairs examined in this report. This subset of data was used to develop parametric equations for an average (pressure-independent), binary Pg-Ms solvus. In accordance with results obtained by previous investigators, the new solvus is strongly asymmetric toward paragonite, and the Ms limb has a shallower slope than the Pg limb. However, calculated solvus critical constants (critical TEMPERATURE = 796.5°C; critical COMPOSITION = 34.1 mol% muscovite) are significantly different from corresponding values obtained from published thermodynamic models for binary Pg-Ms micas.

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