Résumés
Abstract
The Park Spur pluton was emplaced in the Aspy terrane of the central Cape Breton Highlands at 374.2 ± 2.9 Ma (U–Pb zircon). It consists mainly of muscovite-biotite monzogranite with small areas of garnet-bearing muscovite monzogranite and abundant pegmatite and aplite dykes. On its northern margin the pluton intruded metamorphic rocks of the Ordovician–Silurian Cape North Group and associated orthogneiss and on the south it intruded low-grade metamorphic rocks of the Silurian Calumruadh Brook Formation. Deformation along the southern margin of the Park Spur pluton is consistent with emplacement during dextral transpression between the Bras d’Or and Aspy terranes. The Late Devonian age combined with S-type petrological characteristics show that the Park Spur pluton and nearby Canal pluton are related to the ca. 375 Ma Black Brook Granitic Suite, all interpreted to have been emplaced during later stages of the Acadian orogeny in Ganderia as a result of delamination.
Résumé
La mise en place du pluton Park Spur à l’intérieur du terrane Aspy dans le centre des Hautes-Terres-du-Cap-Breton remonte à 374,2 ± 2.9 Ma (datation U–Pb sur zircon). Le pluton est essentiellement constitué de monzogranite à deux micas comportant de petites sections de monzogranite à muscovite grenatifère et une abondance de dykes pegmatitiques et aplitiques. Sur sa bordure septentrionale, le pluton a pénétré des roches métamorphiques du groupe ordovicien-silurien de Cape North et de l’orthogneiss associé, alors qu’il a pénétré au sud des roches faiblement métamorphisées de la Formation silurienne de Calumruadh Brook. La déformation le long de la bordure méridionale du pluton Park Spur correspond à une mise en place durant la transpression dextre survenue entre les terranes Bras d’Or et Aspy. L’âge du Dévonien tardif conjugué aux caractéristiques pétrologiques supracrustales révèle que le pluton Park Spur et le pluton Canal voisin sont apparentés à la suite granitique d’environ 375 Ma du ruisseau Black, tous interprétés comme des éléments s’étant mis en place au cours des stades tardifs de l’orogenèse acadienne dans Ganderia à la suite d’une délamination.
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