Mineral equilibria in the system nepheline-alkali feldspar-plagioclase and their petrological significance
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Abstract
The purpose of this work is a theoretical consideration of equilibrium conditions in the system nepheline-alkali feldspar-plagioclase-alkali chloride aqueous solution based on the thermodynamic treatment of experimental data (Orville, 1963; Iiyama et al., 1963; Debron et al., 1961) for particular systems. The excess thermodynamic functions (ZE, SE, HE, VE) of solid solutions were calculated for it. These data enable us to derive the diagrams of isotherms for the distribution of sodium components between nepheline and alkali feldspar; between plagioclase and alkali feldspar; and among plagioclase, nepheline, and alkali feldspar for the temperature range 400-1000° C.In order to check the calculated diagrams we analysed the minerals from the binary and ternary assemblages of the systems nepheline$alkali feldspar$plagioclase from various igneous massifs of nepheline syenites of the world. Temperatures obtained from different geothermometers were found to coincide satisfactorily.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Mineral equilibria in the system nepheline-alkali feldspar-plagioclase and their petrological significance |
| Series title | Journal of Petrology |
| DOI | 10.1093/petrology/9.1.123 |
| Volume | 9 |
| Issue | 1 |
| Year Published | 1968 |
| Language | English |
| Publisher | Oxford University Press |
| Description | 45 p. |
| First page | 123 |
| Last page | 167 |
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