Abstract

A 10 km wide, subcircular body of highly recrystallized anorthosite (meta-anorthosite) located north of La Tuque, Québec, is partially surrounded by an aureole of gneisses in the granulite facies. It is foliated near the edges, but lineated in the center. Pegmatites and mafic dikes were intruded into the anorthosite after the major phase of emplacement, but before a later, minor phase of deformation. Younger pegmatites post-date all deformation. The pluton appears to have been emplaced like a hot diapir, possibly during the Grenvillian thermostructural event.

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