Geochemical and Isotopic Characteristics of Granitoids of the Avalon Zone, Southern New Brunswick: Possible Evidence for Repeated Delamination Events

Whalen, J B; Jenner, George A.; Currie, K. L.; Barr, Sandra M.; Longstaffe, Frederick J.; Hegner, E.

doi:10.1086/629670

Cited by 100 publications

(84 citation statements)

References 34 publications

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“…They are similar in age and tectonic setting to the Precambrian basement rocks of Ganderia (in particular the New River Terrane) but are isotopically less evolved (Whalen et al 1994;Barr et al 1998;Samson et al 2000;Satkoski et al 2010).…”

Section: Caledonia Terranementioning

confidence: 90%

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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Section: Caledonia Terranementioning

confidence: 90%

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

Fyffe

2014

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“…U-Pb provenance studies of midSilurian conglomerate within the sequence indicate amalgamation of all Neoproterozoic blocks, including the Caledonia belt, prior to conglomerate deposition (Fyffe et al 2001). In contrast, a tentative model based on Nd, O and Pb isotopes was presented by Whalen et al (1994), wherein all Late Neoproterozoic terranes in southern New Brunswick could have been amalgamated in Neoproterozoic time. Interpretations based on additional Nd isotopic data from southern New Brunswick presented by Samson et al (2000) suggest that the New River and Brookville belts are actually parts of a single belt.…”

Section: Discussionmentioning

confidence: 99%

Mafic intrusions on Campobello Island: implications for New Brunswick - Maine correlations

McLeod

Pickerill

Lux

2001

atgeol

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Late Ordovician through Early Devonian units of the Passamaquoddy Bay area are interpreted to represent sequences that evolved in arc and back-arc environments. The main elements of the arc are exposed on Campobeilo Island and include a predominantly felsic volcanic sequence to the northeast, a sequence of intercalated turbidite and mafic volcanic rocks to the southwest, and mafic dyke swarms throughout. Petrographic, geochemical, and 40Ar/39Ar studies of these rocks record episodic deformation and varying degrees of metamorphism up to lower amphibolite facies, and a protracted history of mafic magma injection from a similar source beginning in the Early Silurian. These features, combined with stratigraphic relationships and overall structural patterns, indicate a rapid transition from felsic-to mafic-dominated magmatism accompanied by radical changes in the depositional regime in the arc with time, and exposure of progressively deeper crustal levels towards the northeast within the arc.Review of the assignment of other units in the Passamaquoddy Bay region to major tectonostratigraphic belts north of Campobeilo Island clarifies regional correlations and provides possible additional links to Neoproterozoic basement in the area.Les unites de TOrdovicien superieur au Devonien inferieur du secteur de la baie Passamaquoddy sont interpretees comme des unites representatives de sequences ayant evolue dans des environnements d'arc et d'arriere-arc. Les principaux elements de Pare affleurent sur Pile Campobeilo et component une sequence principalement volcanofelsique au nord-est, une sequence volcanomafique/turbiditique intercalee au sud-ouest et des groupes de filons mafiques un peu partout. Des etudes petrographiques, geochimiques et 40Ar/39Ar de ces roches reinvent une deformation episodique et des degres divers de metamorphisme jusqu'au facies amphibolique inferieur, ainsi que des antecedents prolongds d'injection de magma mafique d'une source similaire a partir du Silurien inferieur. Ces p articulars, conjuguees aux relations stratigraphiques et aux configurations structurales generates, revelent une transition rapide d'un magmatisme a predominance felsique a un magmatisme a predominance mafique accompagne de changements spectaculaires dans le regime de sedimentation a Pinterieur de Parc avec le temps, ainsi qu'un affleurement de niveaux crustaux progressivement plus profonds vers le nord-est a Pintdrieur de Parc. L'examen de Paffectation des autres unites dans la region de la baie Passamaquoddy aux principals structures teconostratigraphiques au nord de Pile Campobeilo clarifie les correlations regionales et foumit des liens suppldmentaires possibles avec le socle du Proterozoi'que superieur du secteur. In t r o d u c t io nDiabase dykes and gabbroic intrusions comprise a significant portion of most Silurian sections in the Passamaquoddy Bay area of southwestern New Brunswick. Numerous older publications based on work in the 1960s and 1970s (e.g., Cumming 1966Helmstaedt 1968;Ruitenberg 1968;Donohoe 1978;Gates 196...

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“…Volcanic rocks of both the Broad River and Coldbrook groups are interpreted on the basis of geochemistry to have formed in an ensialic magmatic arc setting (Currie and Eby 1990;Barr and White 1996a), although an extensional setting is also proposed for the latter (Barr and White 1996b). They are similar in age and tectonic setting to those on the trailing edge of Ganderia (Brookville and New River terranes) but are isotopically less evolved (Whalen et al 1994a(Whalen et al , 1996aBarr et al 1998;Samson et al 2000).…”

Section: Caledonia Terranementioning

confidence: 99%

“…The Broad River Group comprises mainly intermediate to felsic crystal tuffs, lithic-crystal tuffs, and tuffaceous sedimentary rocks associated with comagmatic plutonic rocks (Point Wolfe River Suite) that range in age from 625 ± 5 Ma to 616 ± 3 Ma. The Coldbrook Group consists of intermediate to felsic lithic tuffs, crystal tuffs, flows and laminated tuffaceous siltstone, associated with comagmatic plutons (Bonnell Brook Suite) that range in age from 557 ± 3 Ma to 550 ± 1 Ma Barr et al 1994;Whalen et al 1994a;Barr and White 1996a, b;Barr and Kerr 1997;Barr and White 1999) (Fig. 4).…”

Section: Caledonia Terranementioning

confidence: 99%

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

Section: Brookville Terranementioning

confidence: 99%

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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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Geochemical and Isotopic Characteristics of Granitoids of the Avalon Zone, Southern New Brunswick: Possible Evidence for Repeated Delamination Events

Cited by 100 publications

References 34 publications

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

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

Mafic intrusions on Campobello Island: implications for New Brunswick - Maine correlations

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

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