Abstracts
Abstract
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 granodlorite to dlorlte zone, and minor porphyritlc granodlorite to monzodlorite 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 magnetlte±chalcopyrlte±schee-lite±molybdenite±pyrite which occur In velnlets 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.
RESUME
Un skarn mineralise (Fe-Cu-W-Mo), situe dans la region de la montagne Whycocomagh, est associe a une petite intrusion ignee d'flge Devonien (402*20 m.a.) qui penetre des roches, principalement des metasediments, du groupe George River (Hadrynien). Le pluton consiste surtout en un granite porphyri-que accompagne d'une zone marginale (granodlorite a diorite), de dykes mineurs (granodlorite a monzodlorite porphyrique) et de pegmatite. L'ensemble ^st calco-alcalln et de "type I". Blen que faiblement mineralise, le pluton Whycocomagh Mountain possede lea caracterlstiques typiques des plutons associes aux depots porphyrlques de type Cu-Mo. Les calco-sfllcates derives des marbres du groupe George River sont les notes principaux du cortege magnetlteichalcopyritetscheelltetmolybdeniteipyrite que I'on retrouve dans des veinules le long des fractures et dlssfimines dans les enveloppes d'alteratlon volsines. Les caracterlstiques du pluton ainsi que la mineralogle du skarn font croire qu'll s'agit d'un depot de skarn cuprifere.
(Tradult par le Journal)
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