Âge et importance tectonique du pluton de Benton, secteur d’Eel River, centre-ouest du Nouveau-Brunswick, Canada

Auteurs-es

  • Leslie R. Fyffe Direction des études géologiques,ministère des Ressources naturelles et du Développement de l’énergie du Nouveau-Brunswick (retraité), Fredericton (Nouveau-Brunswick) E3B 5H1 CANADA
  • Allan Ludman École des sciences de la terre et de l’environnement (professeur émérite), Collège Queen (CUNY), Flushing, New York 11367 ÉTATS-UNIS
  • Christopher McFarlane Département des sciences de la terre, Université du Nouveau-Brunswick, Fredericton (Nouveau-Brunswick) E3B 5A3 CANADA

DOI :

https://doi.org/10.4138/atlgeo.2023.004

Résumé

Le pluton de Benton, situé dans le secteur d’Eel River dans le centre-ouest du Nouveau-Brunswick, au Canada, est constitué de deux éléments : la monzonite de quartz du ruisseau Caldwell et le monzogranite du chemin Dugan. Leurs rapports sur le terrain laissent supposer que les deux éléments sont essentiellement du même âge, celui du chemin Dugan étant légèrement plus récent. Le pluton de Benton pénètre des roches sédimentaires du Cambrien à l’Ordovicien précoce du groupe de Woodstock ainsi que des roches sus-jacentes calco-alcalines rhyolitiques, andésitiques, dacitiques et basaltiques de l’Ordovicien précoce à moyen de la partie inférieure du groupe de Meductic. Une nouvelle datation U–Pb (LA-ICP-MS) sur zircon de 467 ± 2 Ma révèle que l’élément de monzogranite du chemin Dugan du pluton de Benton s’est mis en place durant la période de l’Ordovicien moyen (du Dapingien tardif au Darriwilien précoce). Le monzogranite du chemin Dugan est plus récent d’environ sept millions d’années que la granodiorite de Gibson et la tonalite du mont Connell apparentées à un arc voisines, et plus récent d’environ 13 millions d’années que les roches volcaniques d’un arc de la Formation de Porten Road, l’unité la plus ancienne du groupe de Meductic. Le pluton de Benton est interprété comme un élément s’étant mis en place dans le cadre d’un arc d’extension active coïncidant avec un déplacement du foyer du volcanisme lié à une subduction depuis le secteur d’Eel River au Nouveau-Brunswick au secteur de Greenfield dans l’État voisin du Maine, aux États-Unis.

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Publié-e

2023-05-01

Comment citer

Fyffe, L. R., Ludman, A., & McFarlane, C. (2023). Âge et importance tectonique du pluton de Benton, secteur d’Eel River, centre-ouest du Nouveau-Brunswick, Canada. Atlantic Geoscience, 59, 087–108. https://doi.org/10.4138/atlgeo.2023.004

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