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Geon 12 crustal extension in the central Grenville Province, implications for the orogenic architecture, and potential influence on the emplacement of anorthosites

Indares, Aphrodite, Moukhsil, Abdelali·2013·Canadian Journal of Earth Sciences
DOI 10.1139/cjes-2012-0161
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Abstract

Remnants of a ca. 1.24 Ga old volcanic belt formed in a within-plate setting (Manicouagan Crustal Extension Belt) are exposed over several tens of kilometres in the hinterland of the central Grenville Province, and can be recognized despite granulite-facies Grenvillian metamorphism and deformation. This belt mainly consists of layered felsic–mafic rock units, some of which are documented here for the first time. In the vicinity of the 1.24 Ga belt, a Geon 14 arc-related mafic suite and a Geon 15 metasedimentary package were pervasively injected by felsic (and mafic) material, show evidence of a Geon 12 thermal event, and therefore may represent remnants of rifted crust. Following Geon 12 crustal extension, lithospheric-scale magmatic activity in the immediate region continued intermittently, producing mafic dykes at 1.17 Ga and anorthosite at 1.16 and 1.05 Ga. A close association to 1.16 Ga or younger anorthosite is conspicuous to several Geon 12 rock units known in the central and eastern Grenville Province. We therefore suggest that subsequent anorthositic magmatism was focused on zones of lithospheric weakness inherited from Geon 12 crustal extension and remained active intermittently until the end of the Grenvillian orogeny.

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  • This association is consistent with emplacement of the anorthosite and the Robe-Noire mafic dykes along reactivated Geon 12 extensional structures.

    “This association is consistent with emplacement of the anorthosite and the Robe-Noire mafic dykes along reactivated Geon 12 extensional structures (Indares and Moukhsil 2013)”

    From The Grenville Province: revisiting the orogenic framework and integrating recent findings (2025) · cites this paper as Indares and Moukhsil 2013

  • ~1.17 Ga mafic dyke swarms including the Robe-Noire dykes in western Wakeham are spatially associated with the ca.1.24 Ga extensional sequences.

    “~1.17 Ga mafic dyke swarms including the Robe-Noire dykes in western Wakeham are spatially associated with the ca.1.24 Ga extensional sequences (see in Indares and Moukhsil 2013)”

    From The Grenville Province: revisiting the orogenic framework and integrating recent findings (2025) · cites this paper as Indares and Moukhsil 2013

  • The supracrustal sequences (western Wakeham, ca.1.27-1.24Ga; Manicouagan Extension Belt, ca. 1.24 Ga) are correlative in age and deposition setting with the 1.27-1.22Ga Seal Lake group, exposed north of the Grenville Front in Labrador.

    “The supracrustal sequences (western Wakeham, ca.1.27-1.24Ga, Martignole et al. 1994;Manicouagan Extension Belt, ca. 1.24 Ga, Indares and Moukhsil 2013) are correlative in age and deposition setting with the 1.27-1.22Ga Seal Lake group (Romer et al., 1995), exposed north of the Grenville Front in Labrador”

    From The Grenville Province: revisiting the orogenic framework and integrating recent findings (2025) · cites this paper as Indares and Moukhsil 2013

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Metadata

Authors
Indares, A., & Moukhsil, A.
Affiliations
  • Department of Earth Sciences, Memorial University of Newfoundland, St. John's, NF, A1B 3X5, Canada.
  • Direction du Bureau de l'Exploration Géologique du Québec, Ministère des Ressources naturelles, 400, boulevard Lamaque, Val-d'Or, QC J9P 3L4, Canada.
Venue
Canadian Journal of Earth Sciences
Publisher
Canadian Science Publishing
Published
2013-09
Volume
50
Issue
9
Pages
955-966
ISSN
  • 0008-4077
  • 1480-3313
DOI
10.1139/cjes-2012-0161
Cited by
15
References
1
Language
en
Licence
www.nrcresearchpress.com/page/about/CorporateTextAndDataMining (tdm)

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