The Nomenclature and Classification of Granulites and Related Rocks of Mont Tremblant Park, Quebec, Canada

The nomenclature of the granulites which are the characteristic rocks of many granulite facies terrains is reviewed. The granulites which are defined in the classical sense are found in two distinct geological settings. In the high-grade metamorphic terrains of the Precambrian shields, the granulites occur associated with large anorthosite bodies as in the case of Mont Tremblant Park, Quebec, Canada. Also granulites are found in cores of old orogens here associated with rocks of eclogitic affinities. A simple classification of granulites consists of two prinicipal groups; quartzo-feldspathic and hypersthene granulites.