Stratigraphie révisée de l’est du terrane de Meguma, Nouvelle-Écosse, Canada, et variations des compositions chimiques de roche totale et isotopiques en Sm–Nd des groupes de Goldenville et d’Halifax

Auteurs-es

  • Sandra M. Barr Department des sciences de la terre et de l’environnement, Université Acadia, Wolfville (Nouvelle-Écosse) B4P 2R6 CANADA
  • Chris E. White Département des ressources naturelles et renouvelables, Halifax (Nouvelle-Écosse) B3J 2T9 CANADA
  • Christian Pin Département de Géologie, UMR 6524 CNRS, Université Blaise Pascal, 5 rue Kessler 63 038 Clermont-Ferrand Cedex FRANCE (retraité)

DOI :

https://doi.org/10.4138/atlgeo.2022.008

Résumé

À la suite de nouveaux travaux de cartographie géologique, les groupes de Goldenville et d’Halifax dans l’est du terrane de Meguma ont été subdivisés en formations. Ils ont une épaisseur stratigraphique totale d’environ 7 750 mètres et correspondent à seulement la moitié supérieure du groupe de Goldenville et à la moitié inférieure du groupe d’Halifax dans les secteurs nord-ouest et sud-est du terrane. La stratigraphie révisée combinée à des données compilées et à de nouvelles analyses des compositions isotopiques en Sm-Nd et en éléments majeurs et traces de roche totale permet une documentation plus détaillée des changements chimiques de la stratigraphie ayant été révélés dans des études antérieures. D’après les compositions chimiques, les compositions protolithiques des échantillons analysés varient de l’arénite lithique au wacke et au schiste. Les caractéristiques des éléments majeurs et traces correspondent à une sédimentation dans une marge continentale active, à des bassins associés à des arcs insulaires ou très probablement à une marge continentale passive comportant des roches volcaniques dans la région d’origine. Les compositions chimiques affichent une abondance sporadique, mais généralement grandissante des éléments lithophiles comme le La et le Th selon la position stratigraphique. Les valeurs epsilon Nd(t) deviennent de plus en plus négatives en allant vers le haut de la section et les âges du modèle mantellique épuisé deviennent de plus en plus avancés. Les données sont conformes à un mélange accru entre des sédiments en provenance de sources crustales supérieures du Mésoprotérozoïque et des sédiments provenant d’un arc magmatique. De telles données correspondent aux configurations du zircon détritique publiées faisant état de quantités croissantes de zircon d’environ 2 Ga ainsi qu’avec une région d’origine comprenant un arc volcanique panafricain (800 à 540 Ma) ou un magmatisme de marge active et une croûte principalement éburnéenne, très probablement dans le craton d’Afrique occidentale.

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2022-07-01

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Barr, S. M., White, C. E., & Pin, C. (2022). Stratigraphie révisée de l’est du terrane de Meguma, Nouvelle-Écosse, Canada, et variations des compositions chimiques de roche totale et isotopiques en Sm–Nd des groupes de Goldenville et d’Halifax. Atlantic Geoscience, 58, 193–213. https://doi.org/10.4138/atlgeo.2022.008

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