Metamorphism of the Flavrian and Powell Plutons, Noranda Area, Quebec     

GOLDIE  R. 《Journal of Petrology》1979,20(2):227-238

The Archaean Flavrian and Powell Plutons are believed to beportions of a single intrusion which has been tectonically disrupted.Both plutons were metamorphosed during the Kenoran Orogeny.The metamorphic minerals formed in the Flavrian Pluton at thistime survived later retrograde metamorphism because this plutonconsists mostly of massive rocks. In the Powell Pluton, however,pervasive fracturing permitted recrystallization of the originalmetamorphic minerals. A model system of 10 components, 10 mineral phases, and CO₂and H₂O provides a suitable basis for mapping isograds in theFlavrian Pluton. According to this model, the stability of amineral assemblage is controlled by temperature and fluid composition;and the distribution of mineral assemblages is related to variationsin these parameters. Application of the model to the plutonsrevealed the presence of 3 areas of high metamorphic temperatures,and a zone where the fluid composition was relatively high inCO₂.  相似文献