Subliquidus glass-glass immiscibility along the albite-diopside join

Details Subliquidus glass-glass immiscibility along the albite-diopside join Subliquidus glass-glass immiscibility along the albite-diopside join

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47..277h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 47, Issue 2, pp.277-282

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Scientific paper

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 Ab 50 Di 50 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 m-0.3 m spherical glass phases.

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