Rb-sr Ages of the 'Sugar' Granite and Lost Lake Granite, Miramichi Anticlinorium, Hayesville map area, New Brunswick

Poole, W H

doi:10.4095/102195

Cited by 3 publications

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“…Peter (1981) Ar (biotite and muscovite) plateau and total gas ages reported for the Burnthill Granite range from 377 to 386 Ma (Taylor et al 1987), including three ages (380 Ma-biotite total gas, 378 ± 3 Ma-biotite plateau; and 379 ± 4 Ma-muscovite total gas) that closely match the U-Pb emplacement age of 380.6 ± 0.3 Ma, as well as the inferred crystallization age of 381 Ma proposed by MacLellan et al (1990). Similarly, Rb-Sr whole-rock isochron ages of 412 ± 12 Ma and 411 ± 13 Ma (Poole 1980), and K-Ar (muscovite) and K-Ar (biotite) ages of 408 ± 7 Ma and 402 ± 4 Ma, respectively (Whalen and Theriault 1990) compare well with the 409.7 ± 0.5 Ma crystallization age of the Lost Lake Granite. Slightly younger K-Ar muscovite and biotite ages of 402 ± 5 Ma and 398 ± 4 Ma, respectively, were reported for the Lost Lake Granodiorite.…”

Section: Discussion Of Geochronological Datamentioning

confidence: 49%

“…Included in this group are the Lost Lake, Beadle Mountain, Juniper Barren, Nashwaak, and Redstone Mountain granites. Associated and generally smaller bodies of granodiorite (Lost Lake and Bogan Brook granodiorites) display a similar range of K-Ar and Rb-Sr ages but commonly have a weak foliation (Poole 1980;St. Peter 1981;Lutes 1981;Crouse 1981a).…”

Section: Overview Of Regional Geologymentioning

confidence: 99%

“…1), and a smaller pluton on the lower part of McKiel Brook ( Fig. 1) that Poole (1980) informally referred to as the "Sugar granite".…”

Section: Overview Of Regional Geologymentioning

confidence: 99%

“…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.…”

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confidence: 99%

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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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Section: Discussion Of Geochronological Datamentioning

confidence: 49%

Section: Overview Of Regional Geologymentioning

confidence: 99%

“…1), and a smaller pluton on the lower part of McKiel Brook ( Fig. 1) that Poole (1980) informally referred to as the "Sugar granite".…”

Section: Overview Of Regional Geologymentioning

confidence: 99%

Section: Overview Of Regional Geologymentioning

confidence: 99%

mentioning

confidence: 99%

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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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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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Origin and U–Pb geochronology of amphibolite-facies metamorphic rocks, Miramichi Highlands, New Brunswick

Fyffe¹,

Barr²,

Bevier³

1988

Can. J. Earth Sci.

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The Miramichi Highlands of New Brunswick are underlain by subgreenschist-to greenschist-facies sedimentary and volcanic rocks of the Cambro-Ordovician Tetagouche Group and by amphibolite-facies paragneisses, amphibolites, and felsic orthogneisses of the Trousers Lake and Sisson Brook suites. New field, geochemical, and geochronologic data for the amphibolites and felsic orthogneisses suggest that they are high-grade metamorphic equivalents of the Tetagouche volcanic rocks and their associated intrusions.Amphibolites in the Miramichi Highlands occur as striped and unstriped varieties that possess chemical characteristics indicative of an igneous origin. However, the two types are compositionally distinct: the striped amphibolites resemble volcanic-arc tholeiites, whereas the unstriped amphibolites are like within-plate tholeiites. The geochemically inferred tectonic origin of these amphibolites is compatible with a recently proposed intracontinental back-arc tectonic setting for the Tetagouche Group.Felsic orthogneisses (Fox Ridge augen granite and Trousers Lake felsic orthogneiss) exhibit concordant contacts with the unstriped amphibolites. U-Pb zircon ages for the Fox Ridge augen granite (451'i5 Ma) and Trousers Lake felsic orthogneisses (434'29 Ma) indicate a Late Ordovician intrusive event. Thus, there is no evidence for Precambrian granite and orthogneiss in the Miramichi Highlands, as had been previously inferred from a correlation with purported Precambrian rocks in the Gander Zone of Newfoundland. The age of the unstriped amphibolites is interpreted as being the same as that of the felsic orthogneisses because these two rock types always exhibit close relationships in the field. The age of the striped amphibolites is less certain, although a correlation with Ordovician basalts of the Tetagouche Group is consistent with their field relationships and tectonic setting.

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Rb-sr Ages of the 'Sugar' Granite and Lost Lake Granite, Miramichi Anticlinorium, Hayesville map area, New Brunswick

Cited by 3 publications

References 0 publications

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

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

Origin and U–Pb geochronology of amphibolite-facies metamorphic rocks, Miramichi Highlands, New Brunswick

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