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Andean style 1.50–1.35 Ga arc dynamics in the Southeastern Laurentian margin: The rifting and reassembly of Quebecia

Groulier, Pierre‐Arthur, Indares, Aphrodite, Dunning, Gregory, Moukhsil, Abdelali·2020·Terra Nova
DOI 10.1111/ter.12482
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Abstract

Quebecia is a unique Geon 15 to 13 composite arc belt in the central Grenville Province that preserves record of rifting and subsequent re‐amalgamation of part of the Laurentian margin. Key lithological components include: (a) c. 1.5 Ga metasedimentary sequences indicative of earlier rifting of the Laurentian margin; (b) remnants of 1.50–1.45 Ga peri‐Laurentian island arcs to the south built on rifted crustal slivers; (c) 1.45–1.42 Ga mafic dyke swarms to the northwest, linked to an asthenospheric window or back‐arc opening; (d) a major 1.43–1.37 Ga felsic plutonic belt marking the time of accretion to Laurentia; and (e) 1.38–1.35 Ga AMCG complexes suggesting slab‐breakoff and mafic underplating of the lower crust during arc accretion. Differences between Quebecia and continental arcs of the same age on both sides attest to lateral variations in subduction dynamics under Laurentia comparable to the modern‐day Andean system.

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Crossref · 10.1111/ter.12482

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  • Juvenile crust is best documented in Quebecia, where pericratonic slivers are inferred to have rifted away from Laurentia at ~1.50 Ga and accreted back at ~1.43-1.37Ga.

    “Juvenile crust is best documented in Quebecia, where pericratonic slivers are inferred to have rifted away from Laurentia at ~1.50 Ga and accreted back at ~1.43-1.37Ga (Groulier et al. 2020).”

    From The Grenville Province: revisiting the orogenic framework and integrating recent findings (2025) · cites this paper as Groulier et al. 2020

  • The rest of the high-T magmatism, together with the Geon 11 AMCGs, is associated in space to formerly pericratonic arc/backarc systems: the Adirondack-Frontenac and Composite Arc belts that were assembled and accreted to Laurentia at ca. 1.22-1.16Ga, and Quebecia that represents rifting of the Laurentian margin and re-amalgamation of pericratonic slivers at ca. 1.50-1.38Ga.

    “The rest, together with the Geon 11 AMCGs, is associated in space to formerly pericratonic arc/backarc systems: the Adirondack-Frontenac and Composite Arc belts that were assembled and accreted to Laurentia at ca. 1.22-1.16Ga (e.g., Carr et al. 2000), and”

    From The Grenville Province: revisiting the orogenic framework and integrating recent findings (2025) · cites this paper as Groulier et al. 2020

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Research works printed but not linked: 34

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Metadata

Authors
Groulier, P., Indares, A., Dunning, G., & Moukhsil, A.
Affiliations
  • Memorial University of Newfoundland and Labrador St. John's NL Canada
  • Ministère de l'Énergie et des Ressources naturelles du Québec Quebec QC Canada
ORCID
Venue
Terra Nova
Publisher
Wiley
Published
2020-07-12
Volume
32
Issue
6
Pages
450-457
ISSN
  • 0954-4879
  • 1365-3121
DOI
10.1111/ter.12482
Cited by
20
References
0
Language
en
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor)
Funders
  • Canadian Network for Research and Innovation in Machining Technology, Natural Sciences and Engineering Research Council of Canada
  • Ministère de l'Énergie et des Ressources Naturelles (8149‐2020‐2021‐04)

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