Geology of the Brookville Terrane, southern New Brunswick, Canada

White, Chris E.; Barr, Sandra M.

doi:10.1130/0-8137-2304-3.133

Cited by 28 publications

(21 citation statements)

References 34 publications

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“…2). Muscovite from the schist yielded 40 Ar/ 39 Ar cooling ages of 603-617 Ma (White 1996). Muscovite from the schist yielded 40 Ar/ 39 Ar cooling ages of 603-617 Ma (White 1996).…”

Section: Caledonia Terranementioning

confidence: 98%

“…The Green Head Group includes the Ashburn Formation (dominantly marble with minor metaclastic rocks) and the Martinon Formation (dominantly metasiltstone with minor calc-silicate rocks, quartzite, conglomerate, and marble). The Green Head Group is in tectonic contact along the MacKay Highway shear zone (White 1996) with the Brookville Gneiss. 750 Ma (H. Hofmann, written communication, 1991).…”

Section: Brookville Terranementioning

confidence: 99%

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Nd isotopic characteristics of terranes within the Avalon Zone, southern New Brunswick

Samson¹,

Barr²,

White³

2000

Can. J. Earth Sci.

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Nd isotopic data are presented for rock units in four terranes within the traditional Avalon Zone of southern New Brunswick. Initial ε Nd values for igneous rocks within the Caledonia terrane range from -1.6 to +4.6, whereas values for sedimentary rocks range from -8.4 to +3.6. A granite within the Kingston terrane has ε Nd (438 Ma) = +4.0. Nd isotopic compositions for the Kingston and Caledonia terranes are similar to those of the Mira terrane in Cape Breton Island, the Antigonish Highlands of Nova Scotia, and plutonic rocks of eastern Newfoundland. Each of these regions may be a dismembered part of a single terrane, the Avalon terrane sensu stricto. Initial ε Nd values for rocks from the Brookville terrane range from -1.3 to +2.8. The Coverdale anorthosite within the Brookville terrane has a present day ε Nd value of -12.1 and a depleted mantle model age of 1.3 Ga, similar to Mesoproterozoic anorthosites in Laurentia. Clastic sedimentary rocks in the Green Head Group have ε Nd (750 Ma) values of -2.0 and -10.9. Viewed as a whole, the Brookville terrane is isotopically more evolved than the Caledonia terrane. Initial ε Nd values for rocks in the New River terrane range from -2.9 to 0.0. The Nd isotopic composition of the Brookville and New River terranes are thus similar to one another and have isotopic character similar to that of the Bras d'Or terrane of Cape Breton Island. It is suggested that all three regions belong to a single terrane (Bras d'Oria).

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“…2). Muscovite from the schist yielded 40 Ar/ 39 Ar cooling ages of 603-617 Ma (White 1996). Muscovite from the schist yielded 40 Ar/ 39 Ar cooling ages of 603-617 Ma (White 1996).…”

Section: Caledonia Terranementioning

confidence: 98%

Section: Brookville Terranementioning

confidence: 99%

Nd isotopic characteristics of terranes within the Avalon Zone, southern New Brunswick

Samson¹,

Barr²,

White³

2000

Can. J. Earth Sci.

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“…4). The platformal rocks of the Green Head Group include marble, which locally contains stromatolites, and lesser quartzose sandstone of the Ashburn Formation; and limestone breccia, siltstone, quartzose sandstone, and quartzite-pebble conglomerate of the Martinon Formation (Hofmann 1974;Currie 1991;White and Barr 1996). Currie (1991) interpreted the Martinon Formation to disconformably overlie the Ashburn Formation whereas White and Barr (1996) considered them to be at least in part laterally equivalent.…”

Section: Brookville Terranementioning

confidence: 99%

“…Plutonic rocks of the Golden Grove suite have intruded the Green Head Group. They range from Late Neoproterozoic to Early Cambrian (548 ± 2 Ma to 528 +1/-3 Ma) and possess mainly calcalkaline, continental-arc geochemical signatures (Whalen et al 1994;Eby and Currie 1996;White and Barr 1996;Currie and McNicoll 1999;White et al 2002;Barr et al 2003b).…”

Section: Brookville Terranementioning

confidence: 99%

The Grand Manan Terrane of New Brunswick: Tectonostratigraphy and Relationship to the Gondwanan Margin of the Iapetus Ocean

Fyffe

2014

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Recently gathered stratigraphic and U–Pb geochronological data indicate that the pre-Triassic rocks of the Grand Manan Terrane on the eastern side of Grand Manan Island can be divided into: (1) Middle Neoproterozoic (late Cryogenian) quartzose and carbonate sedimentary sequences (The Thoroughfare and Kent Island formations); (2) a Late Neoproterozoic (early Ediacaran) volcanic-arc sequence (Ingalls Head Formation); and (3) Late Neoproterozioc (mid- Ediacaran) to earliest Cambrian (early Terreneuvian) sedimentary and volcanic-arc sequences (Great Duck Island, Flagg Cove, Ross Island, North Head, Priest Cove, and Long Pond Bay formations). A comparison to Precambrian terranes on the New Brunswick mainland (Brookville and New River terranes) and in adjacent Maine (Islesboro Terrane) suggests that the sedimentary and volcanic sequences of the Grand Manan Terrane were deposited on the continental margin of a Precambrian ocean basin that opened during the breakup of Rodinia in the Middle Neoproterozoic (Cryogenian) and closed by the Early Cambrian (Terreneuvian) with the final assembling of Gondwana. Rifting associated with the initial opening of the Paleozoic Iapetus Ocean began in the Late Neoproterozoic (late Ediacaran) and so overlapped in time with the closing of the Precambrian Gondwanan ocean. The southeastern margin of the Iapetus Ocean is defined by thick sequences of quartz-rich Cambrian sediments (within the St. Croix and Miramichi terranes of New Brunswick) that were largely derived from recycling of Precambrian passive-margin sedimentary rocks preserved in the Grand Manan and Brookville terranes of New Brunswick and in the Islesboro Terrane of Maine. These Precambrian terranes are interpreted to represent dextrally displaced basement remnants of the Gondwanan continental margin of Iapetus, consistent with the model of a two-sided Appalachian system proposed by Hank Williams in 1964 based on his work in Newfoundland.SOMMAIREDes données stratigraphiques et géochronologiques U–Pb obtenues récemment indiquent que les roches prétriasiques du terrane de Grand Manan du côté est de l’île Grand Manan peuvent être répartis en: 1) séquences sédimentaires quartzeuses et carbonatées du Néoprotérozoïque moyen (Cryogénien tardif) (formations de Thoroughfare et de Kent Island); 2) séquence d’arc volcanique du Néoprotérozoïque tardif (Édiacarien précoce) (formation d’Ingalls Head); 3) séquences sédimentaires et d’arc volcanique du Néoprotérozoïque tardif (milieu de l’Édiacarien) au tout début du Cambrien (Terreneuvien précoce) (formations de Great Duck Island, Flagg Cove, Ross Island, North Head, Priest Cove et Long Pond Bay). Une comparaison avec des terranes du Précambrien dans la partie continentale du Nouveau-Brunswick (terranes de Brookville et New River) et dans le Maine adjacent (terrane d’Islesboro) semble indiquer que les séquences sédimentaires et volcaniques du terrane de Grand Manan se sont déposées sur la marge continentale d’un bassin océanique précambrien qui s’est ouvert durant la fracturation de la Rodinia au Néoprotérozoïque moyen (Cryogénien) et s’est fermé au Cambrien précoce (Terreneuvien) avec l’assemblage final du Gondwana. La distension continentale associée à l’ouverture initiale de l’océan Iapetus au Paléozoïque a commencé au Néoprotérozoïque tardif (Édiacarien tardif) et a donc partiellement coïncidé avec la fermeture de l’océan précambrien du Gondwana. La marge sud-est de l’océan Iapetus est définie par d’épaisses séquences de sédiments cambriens riches en quartz (dans les terranes de St. Croix et de Miramichi du Nouveau-Brunswick) issus en grande partie du recyclage de roches sédimentaires de la marge continentale passive du Précambrien préservées dans les terranes de Grand Manan et de Brookville au Nouveau-Brunswick et dans le terrane d’Islesboro dans le Maine. Ces terranes précambriens sont interprétés comme la représentation de vestiges, ayant subi un déplacement dextre, du socle de la marge continentale gondwanienne de l’océan Iapetus, ce qui concorde avec le modèle d’un système appalachien à deux côtés proposé par Hank Williams en 1964 sur la base de ses travaux à Terre-Neuve.

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“…The Brookville belt is characterized by Neoproterozoic metasedimentary and ortho-and paragneissic rocks, as well as abundant ca. 550-528 Ma plutonic rocks and minor volcanic rocks (White and Barr 1996;White et al 2002;Barr et al 2014). The Kingston belt is a succession of Silurian (ca.…”

Section: Geological Settingmentioning

confidence: 99%

U-Pb (zircon) age for the Beaver Harbour Porphyry, New River belt, southern New Brunswick, Canada

Barr

Bartsch

Miller³

et al. 2014

atgeol

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The Beaver Harbour Porphyry is a high-level intermediate to felsic granitoid and locally tuffaceous unit with quartz and less abundant feldspar phenocrysts. It forms a fault-bound sliver along the southern margin of the New River belt in southern New Brunswick. A concordant TIMS U-Pb (zircon) age of 551 ± 1.2 Ma shows that the porphyry is of the same age as other high-level plutonic and volcanic units that form most of the New River belt. Chemical data show that these units likely formed in a volcanic-arc environment at an active continental margin. One sample from the porphyry has ε Nd(t) of -0.5, within the range of other samples from the New River belt and consistent with the interpretation that the belt is part of Ganderia, rather than Avalonia, which generally has more juvenile isotopic signatures. RÉSUMÉLe porphyre de Beaver Harbour est un intermédiaire de haut niveau au granitoïde felsique et constitue une unité tufacée par endroits comportant des phénocristaux de quartz et, moins abondamment, de feldspath. Il forme un copeau du substratum rocheux limité par les failles le long de la marge Sud de la ceinture de New River, au sud du NouveauBrunswick. L'âge de 551 ± 1,2 Ma concordant, obtenu par datation U-Pb sur zircon à l'aide de la spectrométrie de masse à thermoionisation, indique que le porphyre a le même âge que d'autres unités plutoniques et volcaniques de haut niveau qui composent la majeure partie de la ceinture de New River. Les données chimiques indiquent que ces unités se sont probablement formées dans un environnement d'arc volcanique, dans une marge continentale active. La valeur ε Nd(t) d'un échantillon du porphyre est de -0,5, ce qui correspond aux valeurs des autres échantillons de la ceinture de New River et à l'interprétation selon laquelle la ceinture fait partie du terrane de Ganderia, et non de l' Avalonia, qui présente généralement des signatures isotopiques plus jeunes.

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Geology of the Brookville Terrane, southern New Brunswick, Canada

Cited by 28 publications

References 34 publications

Nd isotopic characteristics of terranes within the Avalon Zone, southern New Brunswick

Nd isotopic characteristics of terranes within the Avalon Zone, southern New Brunswick

The Grand Manan Terrane of New Brunswick: Tectonostratigraphy and Relationship to the Gondwanan Margin of the Iapetus Ocean

U-Pb (zircon) age for the Beaver Harbour Porphyry, New River belt, southern New Brunswick, Canada

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