Thermodynamic Mixing Models for Muscovite--Paragonite Solutions Based on Solution Calorimetric and Phase Equilibrium Data |
| |
Authors: | ROUX JACQUES; HOVIS GUY L |
| |
Institution: | 1CENTRE DE RECHERCHES SUR LA SYNTHSE ET CHIMIE DES MINRAUX, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE 1A RUE DE LA FROLLERIE, 45071 ORLANS CEDEX 2, FRANCE
2DEPARTMENT OF GEOLOGY AND ENVIRONMENTAL GEOSCIENCES, LAFAYETTE COLLEGE EASTON, PA 18042, USA |
| |
Abstract: | Enthalpies of solution have been measured on a series of muscoviteparagonitemicas in 20.1% HF at 50C under isoperibolic conditions. Themolar enthalpy of formation of paragonite at 298 K, for whichno calorimetrically measured value is currently available, hasbeen determined to be 5937.5 (3) kJ. An inversion ofall calorimetric, volumetric and phase equilibrium data hasbeen performed, giving a range of mixing models compatible withmost experimental data. The following expressions of the mixingproperties of 2M1 micas for enthalpy (Hex) and volume (Vex)at pressures up to 10 kbar, forcing excess entropy (Sex) tobe zero and using a subregular mixing model are favoured: Hex(kJ) = 10.6+4.45(12Xms)]Xms(1Xms) Vex(J/bar) = 0.452Xms(1Xms). However, mixing models of higher order with asymmetric negativeSex are also possible. KEY WORDS: muscovite; paragonite; solvus; calorimetry; solid solution
*Corresponding author. |
| |
Keywords: | |
本文献已被 Oxford 等数据库收录! |
|