Age of deformation within the Central Metasedimentary Belt boundary thrust zone, southwest Grenville Orogen: constraints on the collision of the Mid-Proterozoic Elzevir terrane
Abstract
U–Pb zircon and titanite geochronology on syntectonic intrusions from the Ontario Central Metasedimentary Belt boundary thrust zone has constrained the timing of two major periods of northwest-directed ductile thrusting on this crustal-scale shear zone. Initiation of deep-seated uppermost amphibolite facies deformation is constrained to a period before 1190 Ma, over 100 Ma earlier than previous estimates. Major reimbrication of the shear zone took place ca. 1080 – 1060 Ma and was more pronounced in the southwestern segment. The initiation of deformation within the boundary thrust zone coincides with the emplacement of the hanging wall Elzevir terrane of the Central Metasedimentary Belt onto the Mid-Proterozoic Laurentian margin. The structural nature and temporal and kinematic consistency of the reimbrication phase along the 200 km exposed length of the shear zone is thought to be due to within-plate reactivation of the existing, rheologically weak structure, a result of continent–continent collision ca. 1080–1060 Ma during the later stage of the Grenville orogenic cycle.Collision of the Elzevir terrane, interpreted to be an ensialic marginal basin, with the Laurentian margin along the Central Metasedimentary Belt boundary thrust zone is thought to potentially record closure of the marginal basin ca. 1190 Ma. A distinctive tonalitic suite of rocks preserved in the boundary thrust zone may be composed of fragments of the remnant arc to the marginal basin.
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The published metamorphic grade for the Bancroft terrane is amphibolite facies at 1080-1060 Ma.
“The published metamorphic grade for the Bancroft terrane is amphibolite facies at 1080-1060 Ma (McEachern and van Breemen 1993, Timmerman et al. 1997)), but field studies point to an earlier amphibolite to granulite facies event in the CMB at >1100 Ma affecting the supracrustal rocks (Easton 1992(Easton , 2000)).”
From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as McEachern and van Breemen 1993
During the Ottawan orogenic pulse (circa 1080-1020 Ma) renewed thrusting occurred throughout the CMB, including in the Bancroft terrane.
“Simultaneously, a structural boundary developed between the Bancroft and the Elzevir terranes during the Shawinigan orogenic pulse, and during the Ottawan orogenic pulse (circa 1080-1020 Ma) renewed thrusting occurred throughout the CMB, including in the Bancroft terrane (McEachern andvan Breemen 1993, Timmerman et al. 1997).”
From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as McEachern and van Breemen 1993
At ca. 1.18 Ga, the CMBbtz was buried to a depth of approximately 35-40 km (~1.0-1.2 GPa).
“At this time, the CMBbtz was buried to depth of approximately 35-40 km (~1.0-1.2GPa).”
From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as McEachern and van Breemen (1993)
Our proposed overthrusting model is similar to the tectonic model of McEachern and van Breemen (1993).
“Our proposed overthrusting model is similar to the tectonic model of McEachern and van Breemen (1993).”
From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as McEachern and van Breemen (1993)
Published monazite ages and zircon ages of the region indicate that the initial crustal stacking occurred before 1100 Ma.
“Published monazite ages (Markley et al. 2018) and zircon ages (McEachern and van Breemen 1993) of the region indicate that the initial crustal stacking occurred before 1100 Ma.”
From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as McEachern and van Breemen 1993
McEachern and van Breemen (1993) proposed that northwest-directed thrusting occurred in two pulses at initially 1.19-1.18 Ga and again at 1.08-1.05 Ga.
“They proposed that northwest-directed thrusting occurred in two pulses at initially 1.19-1.18Ga and again at 1.08-1.05Ga.”
From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as McEachern and van Breemen (1993)
The CMBbtz was involved in ductile thrusting at ca. 1.18 Ga that was a result of the emplacement of the Elzevir terrane onto the Proterozoic Laurentia margin.
“They infer that the CMBbtz was involved in ductile thrusting at ca. 1.18 Ga that was a result of the emplacement of the Elzevir terrane onto the Proterozoic Laurentia margin.”
From The role of excess oxygen for modeling high-Mn, low-Ca garnets in metapelites from the northern Central Metasedimentary Belt of the Grenville Province, Ontario, Canada (2021) · cites this paper as McEachern and van Breemen (1993)
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Dunn, S. R., Markley, M. J., Kotikian, M., Achenbach, K., Montanye, B., & Peck, W. H. (2019) · American Mineralogist · doi:10.2138/am-2019-6757 · Cited by 11 · see citing works
Duesterhoeft, E., Raase, P., Duguet, M., & Easton, R. M. (2021) · Canadian Journal of Earth Sciences · doi:10.1139/cjes-2019-0238 · Cited by 4 · see citing works
- Authors
- McEachern, S. J., & Breemen, O. V.
- Venue
- Canadian Journal of Earth Sciences
- Publisher
- Canadian Science Publishing
- Published
- 1993-06-01
- Volume
- 30
- Issue
- 6
- Pages
- 1155-1165
- ISSN
- 0008-4077 (ISSN-L)
- 1480-3313
- OpenAlex
- W2088091813
- Cited by
- 79
- References
- 0
- Citations by year
- 2026: 1 · 2024: 1 · 2023: 1 · 2020: 2 · 2019: 2 · 2018: 1 · 2014: 1 · 2013: 3 · 2012: 3
- FWCI
- 6.76
- 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
- Central Metasedimentary Belt, Grenville orogen, Laurentian margin, continental collision, zircon U-Pb geochronology, titanite geochronology, Proterozoic orogeny, deformation timing
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