Stratigraphie révisée du Paléozoïque supérieur du secteur de Blacks Harbour-Beaver Harbour, Nouveau-Brunswick, Canada : observations émanant de nouveaux travaux de palynologie et de cartographie du substrat rocheux

Auteurs-es

  • Steven J. Hinds Direction des études géologiques, ministère des Ressources naturelles et du Développement de l’énergie, Fredericton (Nouveau-Brunswick) E3B 5H1, CANADA
  • Adrian F. Park Direction des études géologiques, ministère des Ressources naturelles et du Développement de l’énergie, Fredericton (Nouveau-Brunswick) E3B 5H1, CANADA
  • Susan C. Johnson Direction des études géologiques, ministère des Ressources naturelles et du Développement de l’énergie, Sussex (Nouveau-Brunswick) E4E 7H7, CANADA
  • Duncan McLean MB Stratigraphy Ltd, 11 Clement Street, Sheffield S9 5EA, ROYAUME-UNI

DOI :

https://doi.org/10.4138/atlgeo.2024.003

Résumé

Des roches sédimentaires du Paléozoïque supérieur forment des enclaves délimitées par de vaste failles décrochantes dans le secteur de Blacks Harbour-Beaver dans le sud-ouest du Nouveau-Brunswick. Ces unités, actuellement incluses dans la Formation du Dévonien supérieur de Perry, le groupe viséen-pennsylvanien de Mabou (Formation de Balls Lake) et le groupe de Cumberland (Formation de Lancaster), ont fait l’objet de diverses interprétations depuis leur cartographie initiale au cours du 19e siècle. La Formation de Perry, une séquence de couches rouges constituée d’un conglomérat grossier, de grès, de schiste modeste et de roches volcanomafiques, a livré des fossiles végétaux (débris indéterminés et fossiles de tiges et racines décortiquées) considérés comme des vestiges remontant d’une façon générale au Dévonien, et très probablement au Famennien. Les strates « carbonifères » se sont avérées plus insolubles. Trois unités ont été définies dans le cadre de travaux cartographiques : la formation de Lighthouse Cove (précédemment « les couches de l’usine de traitement du poisson »), la Formation de Cripps Steam et la Formation de Russels Point, (précédemment « la Formation de Beaver Harbour »). Les unités en question ont livré des fossiles végétaux sous forme de débris indéterminés et de fragments de tiges et racines décortiquées que divers chercheurs ont attribués au Silurien, au Dévonien, au Mississippien ou au Pennsylvanien. De nouvelles analyses palynologiques de la Formation Perry (à Tunaville) et de la Formation de Russels Point (dans l’anse Woodland et sur la pointe Russels) ont fourni des assemblages stratégiquement significatifs. L’assemblage de Tunaville, premiers miospores relevés à l’intérieur de la Formation Perry, qui sont présents vers le milieu de la séquence, sont du Famennien inférieur à moyen. Deux assemblages de miospores se trouvent près de la base de la Formation de Russels Point : l’un affiche une fourchette possible du Tournaisien à l’Holkérien (Viséen moyen) et le second se limite de façon plus précise entre le Tchadien et l’Holkérien (du Viséen inférieur à moyen). Seule la Formation de Lighthouse Cove (« couches de l’usine de traitement du poisson ») n’a pas présenté d’assemblages de miospores, mais les considérations cartographiques et structurales pertinentes sont compatibles avec un âge de l’unité supérieur à celui de la Formation de Russels Point et inférieur à celui de la Formation Perry, correspondant vraisemblablement à la période du Tournaisien au Viséen inférieur. Un nouveau lien stratigraphique a été découvert le long du rivage sud de Deadmans Harbour à l’endroit où une discordance angulaire s’inscrit entre les couches rouges de la Formation Perry et les couches grises de la Formation sus-jacente de Russels Point. Les modes opposés de déformation dans ces unités liés au déplacement sur la faille de Belleisle restreignent une phase déterminante du coulissage à l’intervalle du Famennien au Tournaisien.

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2024-03-11

Comment citer

Hinds, S. J., Park, A. F., Johnson, S. C., & McLean, D. (2024). Stratigraphie révisée du Paléozoïque supérieur du secteur de Blacks Harbour-Beaver Harbour, Nouveau-Brunswick, Canada : observations émanant de nouveaux travaux de palynologie et de cartographie du substrat rocheux. Atlantic Geoscience, 60, 037–061. https://doi.org/10.4138/atlgeo.2024.003

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Vol. 60 (2024)

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Articles

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