Subliquidus glass-glass immiscibility along the albite-diopside join

D. J. Henry, I. D.R. Mackinnon, I. Chan, A. Navrotsky

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

A calorimetric study has shown that glasses along the albite-diopside join in the system albiteanorthite-diopside have positive enthalpies of mixing. Thermodynamic calculations based on these data describe a nearly symmetric, metastable, subliquidus irascibility gap along the join with a critical temperature at 910 K. The existence of the miscibility gap was tested experimentally by annealing an Ab50Di50 glass at 748 K and 823 K. Annealed glasses were examined by optical microscopy and by scanning and transmission electron microscopy. The glasses showed morphological and chemical features consistent with unmixing of two glass phases. The apparent mechanism of phase separation involves initial spinodal decomposition followed by coarsening to produce 0.1 μm-0.3 μm spherical glass phases.

Original languageEnglish (US)
Pages (from-to)277-282
Number of pages6
JournalGeochimica et Cosmochimica Acta
Volume47
Issue number2
DOIs
StatePublished - Feb 1983

ASJC Scopus subject areas

  • Geochemistry and Petrology

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