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Monazite as a metamorphic chronometer, south of the Grenville Front, western Quebec
Abstract
Monazite was utilized as a chronometer to examine the effects of high-grade metamorphism across the Parautochthonous Belt and Allochthon Boundary Thrust of the Grenville Province in western Quebec. This study, in addition to previous geo-chronological studies, indicates an Archean component in the gneisses, which is consistent with the presence of more than one set of peak metamorphic conditions.Single-grain monazite analyses from metasedimentary gneisses from four locations within the Parautochthonous Belt yielded Grenvillian U–Pb dates of 1000 ± 5 to 1006 ± 2 Ma. The location farthest to the northwest, 45 km southeast of the Grenville Front, included monazite with a distinct Archean signature. Southeast of this point an Archean signature was not detected in the monazite. At 70 km southeast of the Grenville Front, monazite yielded two discrete ages of 1005 ± 2 and 1020 ± 3 Ma. Xenotime from one location indicated that the closure temperature of this mineral may be equivalent to that of monazite (725 ± 25 °C).Monazite from the Allochthon Boundary Thrust, 135 km southeast of the Grenville Front, yielded 207Pb/206Pb dates of 1049–1092 Ma, indicating earlier cooling than rocks closer to the Grenville Front. The monazite age was combined with that of rutile from the same location to determine a cooling rate of 2 °C/Ma following cooling through the closure temperature of monazite. The abrupt transition from Archean to Grenvillian ages some 45 km southeast of the Grenville Front is…
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In the Réservoir Dozois terrane, the Grenvillian metamorphic overprint only becomes more pervasive about 50 km southeast of the Grenville Front in the vicinity of an extensional shear zone (the Dorval detachment), where circa 1 Ga monazite ages and both Archean and Grenvillian monazite ages in single samples have been recorded.
“In this terrane, the Grenvillian metamorphic overprint only becomes more pervasive about 50 km southeast of the Grenville Front in the vicinity of an extensional shear zone (the Dorval detachment), where Childe et al. [1993] recorded circa 1 Ga monazite ages from gneisses that yielded Archean Sm-Nd model ages, and Martignole and Martelat [2005] recorded both Archean and Grenvillian monazite ages”
From Grenville Front zone, Gagnon terrane, southwestern Labrador: Configuration of a midcrustal foreland fold‐thrust belt (2008) · cites this paper as Childe et al., 1993
In the Reservoir Dozois region, monazite records ages between 1020 and 995 Ma.
“In the same region, monazite records ages between 1020 and 995 Ma (Childe et al. 1993) (Fig. 6).”
From The Grenville Province: revisiting the orogenic framework and integrating recent findings (2025) · cites this paper as Childe et al. 1993
Increase in metamorphic grade in the Grenville Front Tectonic Zone of western Quebec is due to progressive exhumation of deeper levels of Archean crust.
“For instance, increase in metamorphic grade in the Grenville Front Tectonic Zone of western Quebec (Fig. 3) is due to progressive exhumation of deeper levels of Archean crust (Indares and Martignole 1989;Childe et al. 1993).”
From The Grenville Province: revisiting the orogenic framework and integrating recent findings (2025) · cites this paper as Childe et al. 1993
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An Overview of Grenville Province Geology, Canadian Shield
Davidson, A. (1998) · Geology of the Precambrian Superior and Grenville Provinces and Precambrian Fossils in North America · doi:10.1130/dnag-gna-c1.205 · Cited by 50
van Gool, J. A. M., Rivers, T., & Calon, T. (2008) · Tectonics · doi:10.1029/2006tc002095 · Cited by 35
The Grenville Province: revisiting the orogenic framework and integrating recent findings
Indares, A. (2025) · Canadian Journal of Earth Sciences · doi:10.1139/cjes-2023-0143 · Cited by 11
Metadata
- Authors
- Childe, F., Doig, R., & Gariépy, C.
- Venue
- Canadian Journal of Earth Sciences
- Publisher
- Canadian Science Publishing
- Published
- 1993-05-01
- Volume
- 30
- Issue
- 5
- Pages
- 1056-1065
- ISSN
- 0008-4077
- 1480-3313
- Cited by
- 36
- References
- 0
- Language
- en
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