Last Gasp of the Grenville Orogeny: Thermochronology of the Grenville Front Tectonic Zone near Killarney, Ontario
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We present U-Pb (titanite, zircon) and $^{40}Ar/^{39}Ar$ (hornblende, mica, K-feldspar) data from a transect across the western part of the Grenville Front Tectonic Zone (GFTZ) near Killarney, Ontario. High-grade metamorphic assemblages (~1450 Ma) in this part of the GFTZ pre-date the Grenvillian orogeny and were primarily exhumed, with little or no metamorphic overprinting, by Grenvillian deformation. The titanite and zircon data form a discordant array with an upper intercept of $1454 \pm 8 Ma$ and a lower intercept of $978 \pm 13 Ma$. These data are interpreted in terms of partial lead loss during a short-lived thermal event that increased in intensity from west to east across the transect. $^{40}Ar/^{39}Ar$ data from hornblende indicate cooling through ~450°C at ~993-979 Ma, multiple diffusion domain models for the interpretation of discordant K-feldspar spectra indicate cooling through ~365-340°C at 990-960 Ma, and muscovite data indicate cooling through ~320°C at -930 Ma. Biotite data are not easily interpreted owing to the effects of partial resetting and/or excess $^{40}Ar$. The thermochronological data suggest that a thermal event with peak temperatures of 500-600°C affected the GFTZ at ~980 Ma, followed by very rapid cooling to ~350°C. We interpret the data in terms of a tectonic model involving rapid exhumation of GFTZ rocks (in response to erosion) in the hangingwall of a crustal-scale shear zone developed during a ~980 Ma episode of convergence.
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Contractional displacements on front-parallel structures have resulted in a rise in metamorphic grade towards the interior of the orogen.
“Grenvillian planar fabrics in the Parautochthonous belt are generally subparallel to the Grenville Front, and contractional displacements on frontparallel structures have resulted in a rise in metamorphic grade towards the interior of the orogen (Haggart et al. 1993; Rivers et al. 1993; Jamieson et al. 1995).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Haggart et al. 1993
The Introduction (page not available) describes an increase in metamorphic grade inward from the Grenville Front, and the Tectonic Interpretation links convergence and shear-zone movement to exhumation. But its conclusions say the high-grade assemblages in the western Grenville Front Tectonic Zone predate Grenvillian deformation and were exhumed with little or no metamorphic overprinting. The paper therefore supports the spatial grade pattern and a role for deformation in exposing it, not the stronger implication that contractional displacement produced the higher metamorphic grade. (LLM, conf=0.84)
Experimental — accuracy not yet measuredThe pattern of northwest-younging displacement and metamorphism is consistent with an overall foreland-(NW-) directed, in-sequence thrust propagation style (understacking) throughout much of the Grenville Province.
“This pattern is consistent with an overall foreland- (NW-) directed, in-sequence thrust propagation style ( understacking in the terminology of Davy and Gillet 1986) throughout much of the Grenville Province (see also Haggart et al. 1993; Rivers et al. 1993; Culshaw et al. 1997).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Haggart et al. 1993
The Introduction reports NW-directed thrusting along the entire Grenville Front, and the Tectonic Interpretation describes a shear zone migrating toward the foreland near Killarney. But the Introduction says the timing of deformation may differ from place to place; the paper does not establish northwest-younging, in-sequence thrust propagation throughout much of the Grenville Province. (LLM, conf=0.85)
Experimental — accuracy not yet measuredAt the beginning of the Rigolet orogeny (c. 1010 Ma), the orogen again went into compression, and the orogenic wedge propagated into its foreland.
“At the beginning of the Rigolet orogeny ( c45 1010 Ma, Fig. 12D), the orogen again went into compression, and the orogenic wedge propagated into its foreland (Haggart et al. 1993; van Gool and Cawood 1994).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Haggart et al. 1993
The Tectonic Interpretation describes a stage of convergence and migration of a shear zone toward the foreland in the study area. It places that migration at about 980 Ma, however, not at the claimed beginning of the Rigolet orogeny around 1010 Ma; it also says the implications for the orogen as a whole remain uncertain. The cited passages have no page number in our copy. (LLM, conf=0.88)
Experimental — accuracy not yet measuredGrenvillian planar fabrics in the Parautochthonous belt are generally subparallel to the Grenville Front.
“Grenvillian planar fabrics in the Parautochthonous belt are generally subparallel to the Grenville Front, and contractional displacements on frontparallel structures have resulted in a rise in metamorphic grade towards the interior of the orogen (Haggart et al. 1993; Rivers et al. 1993; Jamieson et al. 1995).”
From The High Pressure belt in the Grenville Province: architecture, timing, and exhumation (2002) · cites this paper as Haggart et al. 1993
The Tectonic Interpretation (p. 585) says that fabrics outside shear zones are parallel to those within them, but does not relate their orientation to the Grenville Front. The Introduction discusses the Front and the Parautochthonous Belt without stating that planar fabrics in the belt are generally subparallel to the Front. Searches for front-parallel fabrics and foliation did not establish the claimed relationship. (LLM, conf=0.70)
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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
- Authors
- Haggart, M. J., Jamieson, R. A., Reynolds, P. H., Krogh, T. E., Beaumont, C., & Culshaw, N. G.
- ORCID
- Jamieson, R. A.
- Venue
- The Journal of Geology
- Publisher
- University of Chicago Press
- Published
- 1993-09
- Volume
- 101
- Issue
- 5
- Pages
- 575-589
- ISSN
- 0022-1376 (ISSN-L)
- 1537-5269
- OpenAlex
- W2023572657
- Cited by
- 66
- References
- 1
- Citations by year
- 2024: 3 · 2023: 1 · 2022: 1 · 2018: 1 · 2017: 3 · 2016: 2 · 2015: 2 · 2014: 1 · 2012: 3
- FWCI
- 3.21
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Locations
- The Journal of Geology (publishedVersion)
- DalSpace (Dalhousie University) (submittedVersion)
- 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 › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
- Keywords
- Grenville orogeny, exhumation, thermal events, titanite U-Pb geochronology, zircon U-Pb geochronology, 40Ar/39Ar dating, cooling history, Precambrian metamorphism
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