Last Gasp of the Grenville Orogeny: Thermochronology of the Grenville Front Tectonic Zone near Killarney, Ontario

Haggart, M. J.; Jamieson, Rebecca Anne; Reynolds, P. H.; Krogh, T. E.; Beaumont, Christopher; Culshaw, Nicholas

doi:10.1086/648250

Cited by 65 publications

(45 citation statements)

References 29 publications

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“…In this study data are presented from a densely sampled, continuous section across one of the most significant tectonic boundaries in the orogen -the transition from its Laurentian foreland, through the Grenville Front Tectonic Zone, into the Central Gneiss Belt. Existing data from this part of the Grenville Procince already suggest a contrast in the cooling history between rocks immediately east of the Grenville Front and rocks in the interior of the orogen (Culshaw et 01.. 1991;Haggart et al, 1993). The present study is intended to bridge the gap in data coverage between these two regions, and to answer the following questions.…”

Section: Introductionmentioning

confidence: 90%

“…Culshaw et al, 1994;Jamieson et al, 1992Jamieson et al, , 1995Corrigan et al, 1994;Ketchum el al., 1993Ketchum el al., , 1994. Recent @Ar/"Ar studies in the western Grenville Province include detailed studies of small areas close to the Grenville Front (York et a[., 1991;Haggart et al, 1993) and regional studies of parts of the Britt domain , Central Gneiss Belt (Cosca et al, 1991) and * Lithoprobe Publication No. 544.…”

Section: Introductionmentioning

confidence: 99%

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⁴⁰Ar/³⁹Ar traverse — Grenville Front Tectonic Zone to Britt Domain, Grenville Province, Ontario, Canada*

Reynolds

Culshaw

Jamieson

et al. 1995

Journal Metamorphic Geology

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40Ar/3yAr data (on hornblende, muscovite and K-feldspar) are presented for samples from the western Grenville Province taken along a 140-km traverse from the Grenville Front into the Britt domain. Our interpretation is based on 28 new analyses, synthesized with 20 previously repoked from the traverse area.In regions where comparisons are possible, muscovite and (large domain) K-feldspar apparent ages appear similar (at c. 920-930 Ma), but throughout the traverse, these are c. 60-70 Myr younger than the hornblende ages. The inferred cooling rate over the c. 350-500°C temperature range, c. 2°C Myr-', is appropriate for exhumation controlled by post-orogenic erosional unroofing. At the Grenville Front Tectonic Zone (GFTZ)-Britt domain boundary there is a c. 25-Myr offset in both hornblende and muscovite/K-feldspar ages. We interpret the lower ages in the Britt domain to reflect variations in crustal thickness and geothermal gradient between the flank and interior of a thick orogen.The argon data from the GFTZ are interpreted in the context of an asymmetric crustal-scale antiformal structure developed during a late episode of convergence. Hornblende from rocks on either side of the core of the antiform has an apparent age of c. 990 Ma, our estimate of the age of the compressional event.In the west, we infer that these date the short-lived thermal event associated with the development of the crustal-scale antiform previously postulated. In the east, the ages reflect the cooling of material brought toward the surface in the flank of the antiform. Hornblendes from the antiform core appear to contain excess radiogenic argon. We suggest that this was the ambient argon in rocks transported from depth that was subsequently trapped when the rocks cooled rapidly.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

⁴⁰Ar/³⁹Ar traverse — Grenville Front Tectonic Zone to Britt Domain, Grenville Province, Ontario, Canada*

Reynolds

Culshaw

Jamieson

et al. 1995

Journal Metamorphic Geology

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“…The Penokean was followed by the Grenville orogeny at 1.16-0.99 Ga (Krogh 1989;Jamieson et al 1992;Haggart et al 1992). This affected the SE sector of the impact structure to yield a polydeformed upper amphibolite facies terrain with local evidence of anatexis (Corfu and Easton 2000).…”

Section: The Grenville Orogenymentioning

confidence: 99%

Tectonic influences on the morphometry of the Sudbury impact structure: Implications for terrestrial cratering and modeling

Spray

Butler²,

Thompson

2004

Meteorit & Planetary Scien

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Abstract-Impact structures developed on active terrestrial planets (Earth and Venus) are susceptible to pre-impact tectonic influences on their formation. This means that we cannot expect them to conform to ideal cratering models, which are commonly based on the response of a homogeneous target devoid of pre-existing flaws. In the case of the 1.85 Ga Sudbury impact structure of Ontario, Canada, considerable influence has been exerted on modification stage processes by late Archean to early Proterozoic basement faults. Two trends are dominant: 1) the NNW-striking Onaping Fault System, which is parallel to the 2.47 Ga Matachewan dyke swarm, and 2) the ENE-striking Murray Fault System, which acted as a major Paleoproterozoic suture zone that contributed to the development of the Huronian sedimentary basin between 2.45-2.2 Ga. Sudbury has also been affected by syn-to post-impact regional deformation and metamorphism: the 1.9-1.8 Ga Penokean orogeny, which involved NNW-directed reverse faulting, uplift, and transpression at mainly greenschist facies grade, and the 1.16-0.99 Ga Grenville orogeny, which overprinted the SE sector of the impact structure to yield a polydeformed upper amphibolite facies terrain. The pre-, syn-, and post-impact tectonics of the region have rendered the Sudbury structure a complicated feature. Careful reconstruction is required before its original morphometry can be established. This is likely to be true for many impact structures developed on active terrestrial planets.Based on extensive field work, combined with remote sensing and geophysical data, four ring systems have been identified at Sudbury. The inner three rings broadly correlate with pseudotachylyte (friction melt) -rich fault systems. The first ring has a diameter of ~90 km and defines what is interpreted to be the remains of the central uplift. The second ring delimits the collapsed transient cavity diameter at ~130 km and broadly corresponds to the original melt sheet diameter. The third ring has a diameter of ~180 km. The fourth ring defines the suggested apparent crater diameter at ~260 km. This approximates the final rim diameter, given that erosion in the North Range is <6 km and the ring faults are steeply dipping. Impact damage beyond Ring 4 may occur, but has not yet been identified in the field. One or more rings within the central uplift (Ring 1) may also exist. This form and concentric structure indicates that Sudbury is a peak ring or, more probably, a multi-ring basin. These parameters provide the foundation for modeling the formation of this relatively large terrestrial impact structure.

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“…It is therefore documented that the ca 1100-1000 Ma Ottawan Orogeny is manifested throughout the Grenville Province by both high-grade metamorphism and large-scale structures. In general, Ottawan thrusting youngs towards the northwest (i.e., foreland) with the youngest faults ( 1000 -980 Ma) recorded along the Grenville Front Tectonic Zone (Haggart et al, 1993;Jamieson et al, 1995).…”

Section: Relationship To the Grenville Province In Generalmentioning

confidence: 99%

Zircon U-Pb geochronology of the Ottawan Orogeny, Adirondack Highlands, New York: regional and tectonic implications

McLelland

Hamilton

Selleck

et al. 2001

Precambrian Research

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Last Gasp of the Grenville Orogeny: Thermochronology of the Grenville Front Tectonic Zone near Killarney, Ontario

Cited by 65 publications

References 29 publications

⁴⁰Ar/³⁹Ar traverse — Grenville Front Tectonic Zone to Britt Domain, Grenville Province, Ontario, Canada*

⁴⁰Ar/³⁹Ar traverse — Grenville Front Tectonic Zone to Britt Domain, Grenville Province, Ontario, Canada*

Tectonic influences on the morphometry of the Sudbury impact structure: Implications for terrestrial cratering and modeling

Zircon U-Pb geochronology of the Ottawan Orogeny, Adirondack Highlands, New York: regional and tectonic implications

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Last Gasp of the Grenville Orogeny: Thermochronology of the Grenville Front Tectonic Zone near Killarney, Ontario

Cited by 65 publications

References 29 publications

40Ar/39Ar traverse — Grenville Front Tectonic Zone to Britt Domain, Grenville Province, Ontario, Canada*

40Ar/39Ar traverse — Grenville Front Tectonic Zone to Britt Domain, Grenville Province, Ontario, Canada*

Tectonic influences on the morphometry of the Sudbury impact structure: Implications for terrestrial cratering and modeling

Zircon U-Pb geochronology of the Ottawan Orogeny, Adirondack Highlands, New York: regional and tectonic implications

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⁴⁰Ar/³⁹Ar traverse — Grenville Front Tectonic Zone to Britt Domain, Grenville Province, Ontario, Canada*

⁴⁰Ar/³⁹Ar traverse — Grenville Front Tectonic Zone to Britt Domain, Grenville Province, Ontario, Canada*