Saga de deux bassins : juxtaposition du bassin fossilifère édiacarien de St. John’s contre le bassin glaciovolcanique de Bonavista sur la péninsule de Bonavista, zone d’Avalon, Terre-Neuve

Auteurs-es

  • Andrea J. Mills Études géologiques de Tere-Neuve-et-Labrador, ministère de l’Industrie, de l’Énergie et de la Technologie, Gouvernement de Terre-Neuve-et-Labrador, St. John’s (Terre-Neuve-et-Labrador A1B 4J6, CANADA
  • Leon Normore Études géologiques d’Australie-Occidentale, ministère de l’Énergie, des Mines, de la Réglementation de l’industrie et de la Sécurité, WA 6004, AUSTRALIE
  • Nicolas Gomez Département des sciences de la terre, Université Memorial de Terre-Neuve, St. John’s (Terre-Neuve-et-Labrador) A1B 3X5, CANADA
  • Gregory R. Dunning Département des sciences de la terre, Université Memorial de Terre-Neuve, St. John’s (Terre-Neuve-et-Labrador) A1B 3X5, CANADA
  • David G. Lowe Département des sciences de la terre, Université Memorial de Terre-Neuve, St. John’s (Terre-Neuve-et-Labrador) A1B 3X5, CANADA

DOI :

https://doi.org/10.4138/atlgeo.2024.007

Résumé

Le supergroupe de Musgravetown (SGM) du bassin de Bonavista constitue l’unité centrale de strates néoprotérozoïques sur la péninsule de Bonavista, dans la zone d’Avalon, dans le nord-est de Terre-Neuve. Dans l’ouest de Bonavista, le groupe marin profond d’environ 620 à 600 Ma, Connecting Point (GCP), est recouvert de façon discordante par le SGM volcanosédimentaire terrestre à marin peu profond d’environ 600 à 540 Ma, mais il est limité par des failles à l’est de la faille Indian Arm. Dans l’est de la péninsule de Bonavista, la faille de l’anse Spillars sépare le SGM des roches du bassin de St. John’s, corrélatives des strates édiacariennes de la presqu’île Avalon (groupes de Conception, St. John’s et Signal Hill) comme le corrobore une datation U–Pb d’environ 566 Ma. Les limites d’âge citées aux présentes confirment l’importance régionale de la faille de l’anse Spillars qui limite temporellement et stratigraphiquement les strates distinctes.

Les roches magmatiques du groupe Bull Arm (SGM basal) se sont mises en place durant une extension régionale prolongée. Le début de l’épisode est marqué par l’éruption de basalte calcoalcalin il y a environ 600 Ma et le dépôt contemporain de conglomérat de galets sur la discordance d’environ 605 à 600 Ma du GCP-SGM dans l’ouest de la péninsule de Bonavista. L’extension s’est poursuivie par l’extrusion de tufs et de roches volcaniques bimodales d’environ 592 Ma de la ceinture volcanique de l’anse Plate à l’est de la faille Indian Arm. La ceinture est recouverte à l’est par le groupe principalement clastique de Rocky Harbour. Ses tufs et sa pépérite, datées par endroits à environ 585 et 576 Ma, respectivement, encadrent la diamictite d’environ 580 Ma de Trinity — un équivalent marin peu profond de la Formation marine profonde Gaskiers du bassin de St. John’s sur la presqu’île Avalon. Les basaltes alcalins de faible volume au-dessous et au-dessus de la diamictite de Trinity établissent un lien spatio-temporel clair entre la glaciation et le magmatisme d’extension. Les strates au-dessous de la diamictite de Trinity affichent des caractéristiques témoignant d’une origine glaciogène et accroissent l’épaisseur et l’étendue aréale des dépôts glaciaires édiacariens de Gaskiers. La glaciation de Gaskiers a vraisemblablement duré plusieurs millions d’années et a été concomitante au magmatisme d’extension d’environ 600 à 576 Ma à l’intérieur de la zone occidentale de proto-Avalonia ou le long de sa marge.

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Publié-e

2024-07-22

Comment citer

Mills, A. J., Normore, L., Gomez, N., Dunning, G. R., & Lowe, D. G. (2024). Saga de deux bassins : juxtaposition du bassin fossilifère édiacarien de St. John’s contre le bassin glaciovolcanique de Bonavista sur la péninsule de Bonavista, zone d’Avalon, Terre-Neuve. Atlantic Geoscience, 60, 131–150. https://doi.org/10.4138/atlgeo.2024.007

Numéro

Vol. 60 (2024)

Rubrique

Special Series: In Recognition of the Geological Career of Sandra M. Barr

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