Other
Scientific paper
Apr 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40..457d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 40, Apr. 1976, p. 457-465.
Other
31
Crystallization, Feldspars, Liquid-Solid Interfaces, Thermodynamic Equilibrium, Aluminum Compounds, Calibrating, Melting, Pressure Effects, Quantitative Analysis, Sodium, Tables (Data)
Scientific paper
Results of experiments investigating the crystallization of plagioclase from natural and synthetic melts are presented and are analyzed in terms of empirical and semiquantitative mixing models for the melt. Elemental partition constants were determined from the results and from other published data. Activities of the melt components were modeled by assuming that the melt consists of two independent quasi-lattices of network-forming and network-modifying components, each of which is an ideal solution of its respective component. The semiquantitative analysis supports the suggestion that Na(+) is strongly associated with tetrahedrally-coordinated Al in the melt. It is shown that it is possible to predict the composition of plagioclase crystallizing under equilibrium conditions from a dry melt of known composition and known temperature at low total pressure.
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