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

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...

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Bibliographic Details
Published in:Terra nova (Oxford, England) England), 2020-12, Vol.32 (6), p.450-457
Main Authors: Groulier, Pierre‐Arthur, Indares, Aphrodite, Dunning, Gregory, Moukhsil, Abdelali
Format: Article
Language:English
Subjects:
Accretion
Asthenosphere
Dynamics
Island arcs
Lithology
Magma
Rifting
Subduction
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Summary: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.
ISSN:0954-4879
1365-3121
DOI:10.1111/ter.12482