| Summary: | The Kuujjuaq terrane of the New Québec Orogen may represent a northern extension of the De Pas batholith, which is thought to be the remnant of a lower Proterozoic continental magmatic arc. Collision between the Kuujjuaq terrane and the Labrador Trough to the west produced intense deformation, associated with large-scale, southwest-directed transport. The Kuujjuaq batholith, thought to be a subduction-related granitoid suite, was emplaced at a late stage in the deformation. Extensive post-tectonic metamorphism involved retrogression of early granulite-facies mineral assemblages. Our interpretation is that the Kuujjuaq terrane was subjected to deep and protracted burial (>40 m.y.). This is consistent with, and most easily explained by, its development within a major continental collision zone such as that between India and Asia.
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