The late Paleoproterozoic to Mesoproterozoic (ca. 1.7–1.2 Ga) evolution of the active southeastern margin of Laurentia terminated with the Grenvillian continental collision and the development of a large, hot, long-duration orogen at ca. 1.09–0.98 Ga. As a result, much of the hinterland of the Grenville Province consists of Paleoproterozoic and Mesoproterozoic rocks, mostly preserved as an imbricate stack of high-grade gneisses, that represent a potential repository of active-margin processes. This study presents geochronologic, geochemical, and isotopic analyses of two granulite-facies suites of ca. 1.45–1.40 Ga mafic tholeiites from the Canyon domain (Manicouagan area, central Grenville Province). One suite consists of 1439 +76/–68 Ma high-FeTi mafic sills with εNd values of –0.4 (TDM 2.57–2.72 Ga), indicate derivation from variably depleted to enriched MORB-type mantle sources, probably in an extensional back-arc setting, before intrusion in a ca. 1.5 Ga supracrustal metasedimentary sequence. The other, previously dated, 1410 ± 16 Ma Mafic to intermediate unit exhibits εNd values of 0.0 to +0.9 (TDM 2.02–2.25 Ga), and variably enriched MORB to arc geochemical signatures, for which formation in a transitional back-arc to arc setting is suggested. Integrated with published information, the new data support a model of a long-lived continental-margin arc and intermittent back-arc development on southeast Laurentia during the mid-Mesoproterozoic (ca. 1.5–1.4 Ga), in which repeated short periods of extension and crustal thinning in the back-arc or intra-arc regions were followed by compression and crustal thickening.
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Research Article|
March 21, 2018
The Geon 14 arc-related mafic rocks from the central Grenville Province
Barun Maity;
Department of Earth Sciences, Memorial University of Newfoundland, Alexander Murray Building, 9 Arctic Avenue, St John’s, NL A1B 3X5, Canada.
Corresponding author: Barun Maity (email: [email protected]).
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Aphrodite Indares
Aphrodite Indares
Department of Earth Sciences, Memorial University of Newfoundland, Alexander Murray Building, 9 Arctic Avenue, St John’s, NL A1B 3X5, Canada.
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Department of Earth Sciences, Memorial University of Newfoundland, Alexander Murray Building, 9 Arctic Avenue, St John’s, NL A1B 3X5, Canada.
Aphrodite Indares
Department of Earth Sciences, Memorial University of Newfoundland, Alexander Murray Building, 9 Arctic Avenue, St John’s, NL A1B 3X5, Canada.
Corresponding author: Barun Maity (email: [email protected]).
Publisher: Canadian Science Publishing
Received:
26 Sep 2017
Accepted:
11 Mar 2018
First Online:
07 Jun 2018
Online ISSN: 1480-3313
Print ISSN: 0008-4077
Published by NRC Research Press
Canadian Journal of Earth Sciences (2018) 55 (6): 545–570.
Article history
Received:
26 Sep 2017
Accepted:
11 Mar 2018
First Online:
07 Jun 2018
Citation
Barun Maity, Aphrodite Indares; The Geon 14 arc-related mafic rocks from the central Grenville Province. Canadian Journal of Earth Sciences 2018;; 55 (6): 545–570. doi: https://doi.org/10.1139/cjes-2017-0197
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Index Terms/Descriptors
- basalts
- Canada
- Canadian Shield
- chemical composition
- Eastern Canada
- electron microscopy data
- facies
- fractional crystallization
- genesis
- granulite facies
- Grenville Province
- hydrothermal alteration
- igneous rocks
- isotope ratios
- isotopes
- Laurentia
- mafic composition
- magmas
- Manicouagan Lake
- metals
- metamorphism
- metasomatism
- Nd-144/Nd-143
- neodymium
- North America
- petrography
- Precambrian
- Proterozoic
- Quebec
- radioactive isotopes
- rare earths
- samarium
- SEM data
- Sm-147/Nd-144
- stable isotopes
- tholeiite
- upper Precambrian
- volcanic rocks
Latitude & Longitude
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