Progressive Metamorphism of the Cross Lake Granodiorite, Ontario, Canada

Kamilli, Diana C.

doi:10.1130/0016-7606(1974)85<1755:pmotcl>2.0.co;2

Cited by 3 publications

(4 citation statements)

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“…Such a mechanism can also account for the delays in reaching peak metamorphic conditions at different localities (e.g., samples GA and FV vs. FM). The limited resetting of the first titanite generation in a middle amphibolite facies domain of Cross Lake granodiorite (Kamilli 1974) is reminiscent of the relations observed in the Western Gneiss Region of Norway, where highpressure metamorphism related to continental collision followed by rapid uplift led to only partial resetting of titanite despite achieving metamorphic temperatures of over 600°C (Tucker et al 1987). The compressional events that shaped Mazinaw terrane fall within the time frame of major shortening across the CMB, the CGB, and the Grenville Front to the north between 1100 and 1000 Ma (e.g., Culshaw et al 19946;Krogh 1994).…”

Section: Northern Beltmentioning

confidence: 99%

“…The Cross Lake pluton forms an elongate northeast-trending gneissic body of granodiorite to tonalite that occupies the core of a double-plunging anticline (Kamilli 1974). At the sampling location the gneiss includes sparse potassic veins isoclinally folded parallel to the main fabric, and also younger, crosscutting potassic veins.…”

Section: Cross Lake Plutonmentioning

confidence: 99%

“…At the sampling location the gneiss includes sparse potassic veins isoclinally folded parallel to the main fabric, and also younger, crosscutting potassic veins. The sample (CL) is a medium-grained, biotite granodiorite, essentially free of visible secondary potassic vein material, and comes from the middle amphibolite facies core of the body (Kamilli 1974).…”

Section: Cross Lake Plutonmentioning

confidence: 99%

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U–Pb geochronology of the Mazinaw terrane, an imbricate segment of the Central Metasedimentary Belt, Grenville Province, Ontario

Corfú¹,

Easton²

1995

Can. J. Earth Sci.

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The Mazinaw terrane, in the Central Metasedimentary Belt of the Grenville Province comprises, volcanic, sedimentary, and plutonic rocks that were intensely folded and faulted, and metamorphosed to as high as upper amphibolite facies. U-Pb geochronology establishes an early period of magmatism and sedimentation at about 1280-1240 Ma, probably in a marginal basin setting, and a multistage metamorphic evolution in the period between 1100 and 980 Ma, which was probably related to crustal thickening by imbrication during compression and wedging of the terrane. Some of the earliest magmatism formed calc-alkalic volcanic rocks of Kashwakamak Formation at 1276 + 2 Ma. An associated sedimentary assemblage was intruded by the Helena trondhjemite stock at 1267 + 5 Ma.

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Section: Northern Beltmentioning

confidence: 99%

Section: Cross Lake Plutonmentioning

confidence: 99%

Section: Cross Lake Plutonmentioning

confidence: 99%

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U–Pb geochronology of the Mazinaw terrane, an imbricate segment of the Central Metasedimentary Belt, Grenville Province, Ontario

Corfú¹,

Easton²

1995

Can. J. Earth Sci.

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“…1) in the CMB of the Grenville Supergroup in eastern Ontario, in the eastern part of the Hastings Basin (Elzevir terrane), approximately 30 km east of the Thanet and Cordova gabbros studied by Berger and York (1981b) and by Lopez-Martinez and York (1983). The geology of the area has been studied in detail by Connelly (1985), Pride and Moore (1983), Moore and Thompson (1980), Carmichael et al (1978), Condie and Moore (1977), Brown et al (1975), Kamilli (1974), Sethuramen and Moore (1973), and Lumbers (1967,1964). The geochronology of the region has recently been sumrnarized by Easton (1986).…”

Section: Geological Setting and Previous Geochronologymentioning

confidence: 96%

An ⁴⁰Ar/³⁹Ar geochronological study of the Elzevir batholith and its bearing on the tectonothermal history of the southwestern Grenville Province, Canada

Hanes¹,

Clark²,

Archibald³

1988

Can. J. Earth Sci.

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Results of 40Ar/39~r step heating for muscovite, potassium feldspar, and plagioclase from the Ca. 1240 Ma Elzevir trondhjemite in the Central Metasedimentary Belt of the Canadian Grenville Province have been combined with earlier data and used to deduce a thermal history for the eastern Elzevir terrane following the Ottawan orogeny (1050-950 Ma). Muscovite yielded precise plateau dates of ca. 900 Ma, whereas the potassium feldspar displayed disturbed age spectra with Ca. 730-760 Ma dates for broad "plateau" regions. This age difference could be explained by slow cooling or by thermal overprinting at 760-800 Ma that has updated the microcline. The plagioclase spectra provide evidence for a low-temperature hydrothermal event Ca. 380 Ma ago that has generated sericite in saussurite and has caused partial argon loss from the microcline. This result agrees with the other plagioclase thermochronometry and paleomagnetism on the Cordova gabbro 25 km to the West but provides a lower estimate for the upper age bracket of this event. It is suggested that earlier models of protracted, post-700 Ma cooling of this part of the Grenville orogen may be a consequence of variable updating of plagioclase by this Devonian alteration event.Results of 40Ar/3yAr step heating for muscovite and microcline from the Bark Lake diorite in the Bancroft terrane are in agreement with earlier work in this area, and the cooling path of the Elzevir trondhjemite is seen to be indistinguishable, within the limitations of the method, from that of the Bark Lake diorite in the time period 1050-750 Ma.Les résultats des analyses de libération par paliers thermiques de 40Ar/3yAr pour la muscovite, le feldspath potassique et le plagioclase extraits de la trondhjémite d'Elzevir, âgée approximativement de 1240 Ma, de la ceinture métasédimentaire centrale de la province de Grenville, Canada, ont été combinés à d'autres données disponibles et utilisés pour reconstituer l'histoire thermique de l'est du terrane d'Elzevir après l'orogenèse de I'Ottawien (1050-950 Ma). La muscovite a fourni des âges-plateaux bien définis autour de 900 Ma, tandis que le feldspath potassique offrait des spectres d'âges 730-760 Ma calculés sur les parties larges des plateaux. La différence entre ces âges peut s'expliquer par un refroidissement lent ou une surimpression thermique à 760-780 Ma qui aurait rajeuni le microcline. Les spectres du plagioclase fournissent des indices d'un événement hydrothermal de basse température datant d'il y a environ 380 Ma et qui a produit la séricite au sein de la saussurite et provoqué la fuite partielle de l'argon du microcline. Ces résultats s'accordent bien avec les données thermochronométriques et paléomagnétiques des plagioclases obtenues pour le gabbro de Cordova situé à 25 km plus à l'ouest, cependant ils donnent une évaluation plus basse à la limite supérieure de la fourchette des âges correspondant à cet événement. Nous croyons, selon les modèles antérieurs d'un refroidissement prolongé, postérieur à 700 Ma, que cette partie de l'orogenèse de...

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Petrogenesis of the Elzevir batholith and related trondhjemitic intrusions in the grenville province of eastern Ontario, Canada

Pride

Moore

1983

Contr. Mineral. and Petrol.

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Progressive Metamorphism of the Cross Lake Granodiorite, Ontario, Canada

Cited by 3 publications

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U–Pb geochronology of the Mazinaw terrane, an imbricate segment of the Central Metasedimentary Belt, Grenville Province, Ontario

U–Pb geochronology of the Mazinaw terrane, an imbricate segment of the Central Metasedimentary Belt, Grenville Province, Ontario

An ⁴⁰Ar/³⁹Ar geochronological study of the Elzevir batholith and its bearing on the tectonothermal history of the southwestern Grenville Province, Canada

Petrogenesis of the Elzevir batholith and related trondhjemitic intrusions in the grenville province of eastern Ontario, Canada

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Progressive Metamorphism of the Cross Lake Granodiorite, Ontario, Canada

Cited by 3 publications

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U–Pb geochronology of the Mazinaw terrane, an imbricate segment of the Central Metasedimentary Belt, Grenville Province, Ontario

U–Pb geochronology of the Mazinaw terrane, an imbricate segment of the Central Metasedimentary Belt, Grenville Province, Ontario

An 40Ar/39Ar geochronological study of the Elzevir batholith and its bearing on the tectonothermal history of the southwestern Grenville Province, Canada

Petrogenesis of the Elzevir batholith and related trondhjemitic intrusions in the grenville province of eastern Ontario, Canada

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An ⁴⁰Ar/³⁹Ar geochronological study of the Elzevir batholith and its bearing on the tectonothermal history of the southwestern Grenville Province, Canada