The Lithoprobe Abitibi-Grenville transect: two billion years of crust formation and recycling in the Precambrian Shield of Canada
Abstract
We summarize the results of Lithoprobe studies in the Neoarchean southeastern Superior Province and the Mesoproterozoic Grenville Province, in the southeastern Precambrian Shield of Canada, through two composite cross-sections based on seismic reflection data, which define dramatically different styles of crust formation and tectonic accretion in the Neoarchean and Mesoproterozoic. In the Neoarchean, the structures at the surface are steep, with discontinuous and flatter structures at depth, much of the crust appears to be juvenile, and the predominant process of crustal growth is inferred to have been subduction-accretion of primitive crust in a prograding arc system. In the Mesoproterozoic, surface structures are shallow and the seismic character of the crust is continuous over the entire cross-section. Archean parautochthonous rocks and reworked Archean crust comprise a very significant proportion of the preserved crust in the Mesoproterozoic and provided the backstop to the Grenvillian orogeny, resulting in the exhumation of crustal rocks formed at high pressures. Preservation of Neoarchean crust, including a thickened lithosphere in the Superior Province, in contrast to its general destruction in younger orogens, may well relate to a unique thermal regime at this time on Earth.
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All three belts were defined on the basis of their Grenvillian tectonometamorphic signatures.
“All three belts were defined on the basis of their Grenvillian tectonometamorphic signatures (Rivers et al. 1989; Ludden and Hynes 2000).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Ludden and Hynes 2000
The lack of a ramp in cross-section A is coincident with the higher proportion of Proterozoic units in the lower crust there and may be a result of their inferred greater ductility.
“The lack of a ramp in cross-section A is coincident with the higher proportion of Proterozoic units in the lower crust there and may therefore be a result of their inferred greater ductility (Ludden and Hynes 2000).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Ludden and Hynes 2000
Deformation and metamorphism during the Rigolet orogeny were restricted principally to the foreland region in the footwall of the HP belt and by inference to the base of the orogenic wedge, although they also occurred farther to the southeast in cross-section D.
“Deformation and metamorphism were restricted principally to the foreland region in the footwall of the HP belt and by inference to the base of the orogenic wedge, although they also occurred farther to the southeast in cross-section D (Ludden and Hynes 2000).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Ludden and Hynes 2000
Rigolet out-of-sequence thrusting and metamorphism occurred in Berthé terrane in the central Grenville Province.
“Rigolet out-of-sequence thrusting and metamorphism in Berthé terrane in the central Grenville Province (Ludden and Hynes 2000)”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Ludden and Hynes 2000
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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
- Ludden, J., & Hynes, A.
- Affiliations
- Centre National de la Recherche Scientifique (FR)
- McGill University (CA)
- Venue
- Canadian Journal of Earth Sciences
- Publisher
- Canadian Science Publishing
- Published
- 2000-04-02
- Volume
- 37
- Issue
- 2-3
- Pages
- 459-476
- ISSN
- 0008-4077 (ISSN-L)
- 1480-3313
- OpenAlex
- W2090246508
- Cited by
- 131
- References
- 0
- Citations by year
- 2026: 1 · 2025: 5 · 2024: 3 · 2023: 2 · 2022: 7 · 2021: 4 · 2020: 5 · 2019: 3 · 2018: 3 · 2017: 7 · 2016: 5 · 2015: 7 · 2014: 8 · 2013: 4 · 2012: 7
- FWCI
- 4.98
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Canadian Journal of Earth Sciences (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
- Lithoprobe, Precambrian Shield, crust formation, Superior Province, Grenville Province, Neoarchean, Mesoproterozoic, crustal accretion, subduction-accretion, Grenville orogeny, crustal exhumation, thermal regime
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