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 language | English (US) |
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Pages (from-to) | 504-512 |
Number of pages | 9 |
Journal | American Mineralogist |
Volume | 79 |
Issue number | 5-6 |
State | Published - 1994 |
All Science Journal Classification (ASJC) codes
- Geophysics
- Geochemistry and Petrology