Thermotectonic evolution of the Grenville Province of western Labrador
Abstract
The Grenville Province in western Labrador comprises three lithotectonic terranes, structurally stacked from northwest to southeast, whose geometric relationships evolved over a time interval from the Early Proterozoic to the Grenvillian Orogeny (circa 1.0 Ga). Gagnon terrane lies immediately southeast of the Grenville Front and is dominated by Early Proterozoic sediments that were deposited unconformably on the Archean basement of the Superior Province. It is overlain to the southeast by the Labradorian magmatic arc of Molson Lake terrane which is itself overlain by the highest structural deck comprising Labradorian migmatites and intrusive rocks of Lac Joseph terrane. The Labradorian magmatic arc of Molson Lake terrane was founded on the margin of mid‐Proterozoic Laurentia and was fueled by northwest directed subduction of oceanic crust that existed between Molson Lake and Lac Joseph terranes. Labradorian magmatic rocks of the exotic Lac Joseph terrane were produced in a second, independent subduction zone of undetermined dip direction. No post‐Labradorian magmatic arc is known to have existed in western Labrador, implying that all three terranes were proximal (part of the same plate) by the end of the Labradorian Orogeny. Rifting of the post‐Labradorian configuration, perpendicular to the Labradorian Front led to the emplacement of the Shabogamo‐Michael Gabbro dyke swarm in a linear belt across the future northern Grenville Orogen. The present terrane geometry of western Labrador is a product of northwest directed thrusting that followed an initial period of crustal thickening during the Grenville Orogen at circa 1000–995 Ma, an event accompanied by penetrative deformation and metamorphism only in Gagnon and Molson Lake terranes.
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Molson Lake terrane consists principally of 1650 Ma granitoid gneisses, part of the Paleoproterozoic Trans-Labrador batholith, cut by dykes of the Mesoproterozoic Shabogamo gabbro.
“This terrane consists principally of 1650 Ma granitoid gneisses, part of the Paleoproterozoic Trans-Labrador batholith (Connelly and Heaman 1993; Connelly et al. 1995), cut by dykes of the Mesoproterozoic Shabogamo gabbro.”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Connelly et al. 1995
Paleo- and Mesoproterozoic units in Gagnon terrane display evidence for a single metamorphism dated at about 1000 Ma (Rigolet orogeny).
“Paleo- and Mesoproterozoic units in Gagnon terrane display evidence for a single metamorphism that has been dated at about 1000 Ma (Connelly and Heaman 1993; Connelly et al. 1995; Schwarz 1998), i.e., Rigolet orogeny.”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Connelly et al. 1995
The metasedimentary gneiss in Lac Joseph terrane displays evidence for two generations of anatectic leucosomes, both of which are Labradorian in age.
“The metasedimentary gneiss displays evidence for two generations of anatectic leucosomes, both of which are Labradorian in age (Connelly et al. 1995).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Connelly et al. 1995
Displacement on the Lac Émérillon shear zone in cross-section E has been dated at 990 Ma.
“and on Lac Émérillon shear zone (cross-section E), it has been dated at 990 Ma (Connelly et al. 1995).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Connelly et al. 1995
Time of displacement on the Lac Émérillon and Hart Jaune shear zones has been dated at c. 990 Ma.
“Time of displacement on the Lac Émérillon and Hart Jaune shear zones has been dated at c45 990 Ma (Scott and Hynes 1994; Connelly et al. 1995).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Connelly et al. 1995
The ramp-flat shape of the Allochthon Boundary detachment in cross-section E is inferred to be a late feature associated with cross-folding.
“The ramp-flat shape of the Allochthon Boundary detachment in cross-section E is inferred to be a late feature associated with cross-folding (Connelly et al. 1995).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Connelly et al. 1995
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The High Pressure belt in the Grenville Province: architecture, timing, and exhumation
Rivers, T., Ketchum, J., Indares, A., & Hynes, A. (2002) · Canadian Journal of Earth Sciences · doi:10.1139/e02-025 · Cited by 124 · see citing works
Self-citation
- Authors
- Connelly, J. N., Rivers, T., & James, D. T.
- ORCID
- Rivers, T.
- Venue
- Tectonics
- Publisher
- American Geophysical Union (AGU)
- Published
- 1995-02
- Volume
- 14
- Issue
- 1
- Pages
- 202-217
- ISSN
- 0278-7407 (ISSN-L)
- 1944-9194
- OpenAlex
- W1993585039
- Cited by
- 34
- References
- 0
- Citations by year
- 2023: 1 · 2019: 1 · 2018: 1
- FWCI
- 3.24
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Tectonics (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Physical Sciences › Earth and Planetary Sciences › Geology › Geological Studies and Exploration
- Physical Sciences › Earth and Planetary Sciences › Geology › Geological and Geophysical Studies
- Keywords
- Grenville Province, thermotectonics, Grenville orogeny, Laurentia, subduction, crustal thickening, penetrative deformation, metamorphism, Proterozoic
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