A phase equilibrium study in the system KAlSi3O8-NaAlSi3O8- SiO2-Al2SiO5-H2O and petrogenetic implications

D. B. Joyce, D. E. Voigt

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Abstract

The effect of saturating haplogranitic melts with sillimanite at 2 kbar was examined by determining near-eutectic or near-minimum melt phase relations in the sillimanite-free and sillimanite-saturated haplogranite systems. Three series of compositions were studied with Ab/(Ab + Sa) ratios of 0, 0.545, and 1.0. The solubility of sillimanite in these melts was found to be insensitive to P and T over the range studied, 2.0 and 6.0 kbar, 680-900°C, but preliminary experiments indicate that it is increased by the presence of mafic components. This lowering of the minimum-melt temperature may explain the observation of apparently primary magmatic andalusite in some granitic rocks. -from Authors

Original languageEnglish (US)
Pages (from-to)504-512
Number of pages9
JournalAmerican Mineralogist
Volume79
Issue number5-6
StatePublished - Jan 1 1994

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

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