Subliquidus glass-glass immiscibility along the albite-diopside join
Henry, D. J., Mackinnon, Ian D. R., Chan, I., & Navrotsky, A. (1983) Subliquidus glass-glass immiscibility along the albite-diopside join. Geochimica et Cosmochimica Acta, 47(2), pp. 277-282.
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.
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|Item Type:||Journal Article|
|Additional Information:||GeoRef, Copyright 2009, American Geological Institute.
|Keywords:||crystal chemistry, enthalpy, glasses, igneous rocks, immiscibility, miscibility gap, optical properties, phase equilibria, silicates, TEM data, thermodynamic properties, volcanic rocks|
|Subjects:||Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Igneous and Metamorphic Petrology (040304)|
|Divisions:||Current > Institutes > Institute for Future Environments|
|Deposited On:||30 Jan 2013 06:26|
|Last Modified:||30 Jan 2013 06:26|
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