The significance of radiometric ages from the Gulquac Lake area of New Brunswick

Fyffe, L. R.; Cormier, R. F.

doi:10.1139/e79-190

Cited by 8 publications

(3 citation statements)

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“…2). The highly deformed Cambrian to Ordovician sedimentary and volcanic strata that define this terrane are intruded by numerous plutons of Middle Ordovician and Late Silurian to Middle Devonian age (Fyffe et al , 1981Fyffe and Cormier 1979;Fyffe 1982;Fyffe et al 1988b;Whalen et al 1996bWhalen et al , 1998. The geological characteristics of the Miramichi Highlands as a whole resemble those of both the Gander Zone and Exploits Subzone of Newfoundland Fyffe 1991, 1995).…”

Section: Miramichi Terranementioning

confidence: 93%

A Review of Proterozoic to Early Paleozoic Lithotectonic Terranes in New Brunswick, Canada and their Tectonic Evolution during Penobscot, Taconic, Salinic and Acadian Orogenesis

Fyffe

Johnson²,

Staal

2012

atgeol

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Geological relationships preserved in the New Brunswick segment of the Appalachian orogen are key to deciphering the complex tectonic events that occurred during the closing of the Paleozoic Iapetus Ocean. These events can be explained in terms of geodynamic interactions between eight lithotectonic terranes. The first, the Caledonia terrane, comprises Neoproterozoic volcanic arc sequences and comagmatic plutons considered to form part of the microcontinent of Avalonia. The seven other terranes are associated with the microcontinent of Ganderia and consist of (1) Brookville terrane-Mesoproterozoic to Neoproterozoic platformal carbonates and Neoproterozoic to Early Cambrian plutonic rocks, (2) New River terrane-Neoproterozoic volcanic arc sequences and comagmatic plutons overlain by a Cambrian Penobscot volcanic arc sequence, In New Brunswick, closure of the Iapetus Ocean is attributed to four major tectonic episodes: (1) the Penobscot orogeny, which accreted the Miramichi, Annidale, and St. Croix terranes to the New River terrane on the trailing edge of Ganderia by closing a Penobscot backarc basin in the Early Ordovician, (2) the Taconic orogeny, which accreted the Popelogan terrane on the leading edge of Ganderia to the Laurentian margin in the Late Ordovician and effectively closed the main tract of the Iapetus Ocean, (3) the Salinic orogeny, which accreted the Elmtree and Miramichi terranes to the Laurentian margin by closing the Tetagouche backarc basin in the Silurian, and (4) the Acadian orogeny, which accreted the Caledonia terrane (Avalonia) to the Brookville and New River terranes on the trailing edge of Ganderia in the latest Silurian to earliest Devonian and in the process closed the last remaining oceanic tract in the northeastern Appalachians. RÉSUMÉLes corrélations géologiques préservées dans la partie du Nouveau-Brunswick de l'orogène des Appalaches sont essentielles pour bien comprendre le déroulement des événements tectoniques complexes survenus au moment de la fermeture de l'océan Iapetus, pendant le Paléozoïque. Il est possible d'expliquer ces événements par des interactions géodynamiques entre huit terranes lithotectoniques. Le premier, soit le terrane calédonien, comprend des séquences d'arc volcanique et des plutons comagmatiques du Néoprotérozoïque dont on estime qu'ils faisaient partie du microcontinent Avalonia. Les sept autres terranes sont associés au microcontinent Ganderia et comprenaient les terranes que voici : (1)

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Section: Miramichi Terranementioning

confidence: 93%

A Review of Proterozoic to Early Paleozoic Lithotectonic Terranes in New Brunswick, Canada and their Tectonic Evolution during Penobscot, Taconic, Salinic and Acadian Orogenesis

Fyffe

Johnson²,

Staal

2012

atgeol

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“…Based on previously acquired Rb-Sr and K-Ar ages (Fyffe and Cormier 1979;Poole 1980;Bevier and Whalen 1990;Whalen and Theriault 1990;see below), and U-Pb zircon and monazite ages from similar plutonic suites farther north (Bevier and Whalen 1990), these granites have been assumed to range in age from late Silurian to Early Devonian. Included in this group are the Lost Lake, Beadle Mountain, Juniper Barren, Nashwaak, and Redstone Mountain granites.…”

Section: Overview Of Regional Geologymentioning

confidence: 99%

“…Almost all granitoid intrusive rocks in New Brunswick were sampled at that time, although difficulties involving access and exposure meant that some plutons, including most of the granites discussed herein, were only examined at a "reconnaissance" level. Geochronological work carried out during this and previous studies included K-Ar and Rb-Sr dating of the Redstone Mountain, Lost Lake, McKiel Lake, Bogan Brook and Nashwaak intrusions (Fyffe and Cormier 1979;Poole 1980;Bevier and Whalen 1990;Whalen and Theriault 1990), and 40 Ar/ 39 Ar dating of the Burnthill Granite (Taylor et al 1987). More recently, attention was focused on New Brunswick granites and associated intrusion-related mineralization during the 2010-2015 federal-provincial Targeted Geoscience Initiative-4 (TGI-4) project (Rogers 2011), the purpose of which was to identify and evaluate "fertile" intrusions and vectors to additional W, Mo, Sn and other deposits.…”

mentioning

confidence: 99%

Geochronology and lithogeochemistry of granitoid rocks from the central part of the Central plutonic belt, New Brunswick, Canada: implications for Sn-W-Mo exploration

Wilson

Kamo

2016

atgeol

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The central part of the Central plutonic belt in New Brunswick is underlain by numerous plutons of calc-alkaline, foliated and unfoliated granite that intrude Cambrian to Early Ordovician metasedimentary rocks. U-Pb (zircon) dating demonstrates that granites range in age from Middle Ordovician to Late Devonian, although most are late Silurian to Early Devonian. An age of 467 ± 7 Ma has been obtained on the foliated McKiel Lake Granite, whereas unfoliated intrusions yield ages of 423.2 ± 3.2 Ma (Bogan Brook Granodiorite), 420.7 +1.8/-2.0 Ma (Nashwaak Granite), 419.0 ± 0.5 Ma (Redstone Mountain Granite), 416.1 ± 0.5 Ma (Beadle Mountain Granite), 415.8 ± 0.3 Ma (Juniper Barren Granite), 409.7 ± 0.5 Ma (Lost Lake Granite), and 380.6 ± 0.3 Ma (Burnthill Granite). All plutons exhibit mixed arc-like and within-plate geochemical signatures, although the Redstone Mountain and Burnthill granites are dominantly of within-plate type. Trace element data reveal a close overall geochemical similarity between Ordovician and Silurian – Devonian plutons, indicating that all were generated by partial melting of the same crustal source. Late Silurian to Early Devonian plutons mainly comprise biotite and/or muscovite-bearing, peraluminous granite and are considered prospective for granophile-element mineralization. All plutons contain Sn well in excess of the granite global average abundance, and several contain average tin values comparable to productive stanniferous granites elsewhere. The Burnthill, Lost Lake, Beadle Mountain, and Nashwaak granites are geochemically most evolved and enriched in Sn and W. The Burnthill Granite in particular has experienced late-stage hydrothermal processes that have resulted in local enrichments of these elements.

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Volcanism and Plutonism in the Appalachian Orogen

Fyffe

Rankin²,

Size

et al. 1983

Regional Trends in the Geology of the Appalachian-Caledonian-Hercynian-Mauritanide Orogen

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The significance of radiometric ages from the Gulquac Lake area of New Brunswick

Cited by 8 publications

References 10 publications

A Review of Proterozoic to Early Paleozoic Lithotectonic Terranes in New Brunswick, Canada and their Tectonic Evolution during Penobscot, Taconic, Salinic and Acadian Orogenesis

A Review of Proterozoic to Early Paleozoic Lithotectonic Terranes in New Brunswick, Canada and their Tectonic Evolution during Penobscot, Taconic, Salinic and Acadian Orogenesis

Geochronology and lithogeochemistry of granitoid rocks from the central part of the Central plutonic belt, New Brunswick, Canada: implications for Sn-W-Mo exploration

Volcanism and Plutonism in the Appalachian Orogen

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