1968, English, Article edition: Mineral Equilibria in the System Nepheline-Alkali Feldspar-Plagioclase and their Petrological Significance PERCHUK, L. L.; RYABCHIKOV, I. D.

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  • text/​html
Published
  • Oxford University Press
  • 1968-02-01 00:00:00.0
Language
  • English

Edition details

Title
  • Mineral Equilibria in the System Nepheline-Alkali Feldspar-Plagioclase and their Petrological Significance
Author
  • PERCHUK, L. L.
  • RYABCHIKOV, I. D.
Published
  • Oxford University Press
  • 1968-02-01 00:00:00.0
Physical Description
  • text/​html
Subjects
Notes
  • 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.
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  • Copyright (C) 1968, Oxford University Press
Language
  • English
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