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Subsolidus crystallization behaviour in the system KAlSi3O8–NaAlSi3O8–H2O

Published online by Cambridge University Press:  05 July 2018

Ian Parsons
Ian Parsons*
Affiliation:
Department of Geology and Mineralogy, Marischal College, Aberdeen AB9 1AS
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Summary

When gels and glasses of alkali feldspar composition are crystallized hydrothermally below their solidus the crystals present when crystallization is incomplete do not have the same Na:K ratio as the starting material but bear a relation to the starting material analogous to that between crystals and liquids coexisting at the liquidus. This effect has been investigated in the temperature range 700–850 °C at water-vapour pressures between 5000 lb/in.2 and 30000 lb/in.2 Fractionation and normal zoning of crystals may, in principle, occur within fixed bulk compositions held under isothermal, isobaric conditions.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 286 , June 1969 , pp. 173 - 180
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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