A working model of some equilibria in the system alumina-silica-water
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ID: 302769
1976
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Abstract
Topological analysis, petrographic, experimental, and thermodynamic data have been used to construct a phase diagram for some equilibria in the system alumina-silica-water. Topological analysis is used to deduce the possible arrangements of univariant curves and invariant points. A choice among the possible arrangements was made using a simple criterion for orientation based on the signs and relative magnitudes of the entropies and volumes of univariant reactions. Experimental data and one assumption regarding some petrographic information were used to locate the univariant and invariant equilibria in pressure-temperature space. The resulting phase diagram suggests that a field for the stable coexistence of pyrophyllite and corundum does not exist. Most natural occurrences of diaspore + quartz probably represent disequilibrium, but a stability field for this assemblage may exist at high pressure. A field for the stable coexistence of pyrophyllite, diaspore, and water might be restricted to pressures where kyanite is stable. It is suggested that pyrophyllite may be stable during the diagenesis or very low-grade metamorphism of sediments. It is concluded that the proposed phase diagram represents a viable working model for some equilibria in this system.
| Reference Key |
openalex_W2131715402
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| Authors | Howard W. Day |
| Journal | american journal of science |
| Year | 1976 |
| DOI |
10.2475/ajs.276.10.1254
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| URL | |
| Keywords | Keywords not found |
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