Abstract
Abstract Diverse, mappable, and variably mylonitised high‐grade gneisses and granitoids, and lamprophyre, trachyte, and basalt dikes comprise the Fraser Complex, which is a new name proposed to replace the existing Fraser Formation. Sillimanite‐bearing pelitic gneisses have an upper amphibolite facies metapelitic mineralogy, indicating temperatures >600°C. Quartzofeldspathic gneisses, lacking sillimanite, are migmatitic, and hornblende gneisses have a diverse epidote‐amphibolite mineralogy. The high‐grade gneisses form a metamorphic suite within the Fraser Complex. Granite, granodiorite, and tonalite are intrusive into the high‐grade gneiss suite, and may have been derived from partial melts of the high‐grade gneisses. Swarms of camptonite lamprophyre, trachyte, and basalt dikes intrude the high‐grade gneisses and the granitoids. Mylonite zones now envelop the gneisses, granitoids, and dikes, and mylonitic deformation occurred at mid‐greenschist facies conditions and resulted in some retrogressive alterat...
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