Pétrologie, âge et cadre tectonique du pluton Park Spur, terrane Aspy, centre des Hautes-Terres-du-Cap-Breton, Nouvelle-Écosse, Canada

Auteurs-es

  • Amanda M. Smith Département des sciences de la terre et de l’environnement, Université Acadia, Wolfville (Nouvelle-Écosse) B4P 2R6 CANADA
  • Sandra M. Barr Département des sciences de la terre et de l’environnement, Université Acadia, Wolfville (Nouvelle-Écosse) B4P 2R6 CANADA
  • Chris E. White Département des sciences de la terre et de l’environnement, Université Acadia, Wolfville (Nouvelle-Écosse) B4P 2R6 CANADA
  • Deanne van Rooyen Département des sciences de la terre et de l’environnement, Université Acadia, Wolfville (Nouvelle-Écosse) B4P 2R6 CANADA
  • Évelyne Sunatori Département des sciences de la terre et de l’environnement, Université Acadia, Wolfville (Nouvelle-Écosse) B4P 2R6 CANADA

DOI :

https://doi.org/10.4138/atlgeo.2023.007

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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2023-08-02

Comment citer

Smith, A. M., Barr, S. M., White, C. E., van Rooyen, D., & Sunatori, Évelyne. (2023). Pétrologie, âge et cadre tectonique du pluton Park Spur, terrane Aspy, centre des Hautes-Terres-du-Cap-Breton, Nouvelle-Écosse, Canada. Atlantic Geoscience, 59, 147–164. https://doi.org/10.4138/atlgeo.2023.007

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