Mineralized (Fe-Cu-W-Mo) skarn in the Whycocomagh Mountain area is associated with a small pluton of Devonian (402+20 Ma) age, which intruded predominantly metasedimentary rocks of the Hadrynian George River Group. The pluton consists largely of granite porphyry with a marginal granodiorite to diorite zone, and minor porphyritic granodiorite to monzodiorite dykes and pegmatite. The suite is calc-alkalic with I-type characteristics. Although weakly mineralized, the Whycocomagh Mountain pluton has features typical of plutons associated with porphyry-type Cu-Mo deposits. Calc-silicate rocks derived from marbles of the George River Group are the chief hosts for magnetite+chalcopyrite+schee-lite±molybdenite±pyrite which occur in veinlets along fractures and as disseminated grains in adjacent alteration envelopes. Characteristics of the pluton and the skarn minerals suggest that the deposit is a copper skarn. Un skarn min6ralis6 (Fe-Cu-W-Mo), situ6 dans la region de la montagne Whycocomagh, est assocife a une petite intrusion ign6e d'Sge Dgvonien (402±20 m.a.) qui pGnetre des roches, principalement des m6tas6diments, du groupe George River (Hadrynien). Le pluton consiste surtout en un granite porphyrique accompagne d'une zone marginale (granodiorite a diorite), de dykes mineurs (granodiorite a monzodiorite porphyrique) et de pegmatite. L'ensemble est calco-alcalin et de "type I". Bien que faiblement mineralise, le pluton Whycocomagh Mountain possede les caractSristiques typiques des plutons associgs aux depots porphyriques de type Cu-Mo. Les calco-silicates derives des marbres du groupe George River sont les hStes principaux du cortege magn6tite±chalcopyrite±scheelite±molybdenite±pyrite que l'on retrouve dans des veinules le long des fractures et dissemings dans les enveloppes d'altgration voisines. Les caractferistiques du pluton ainsi que la minferalogie du skarn font croire qu'il s'agit d'un d6p6t de skarn cuprifere.[Traduit par le journal]
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