Lithotectonic map of the Appalachian Orogen, Canada-United States of America

Hibbard, James P.; Staal, Cees R. van; Rankin, Douglas W.; Williams, Harold

doi:10.4095/221912

Cited by 136 publications

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“…However, the recognition that the Early Ordovician Penobscot orogeny, first defined in Maine (Neuman 1967), had affected other parts of the Gander Zone led to a more realistic model for the Early Paleozoic plate tectonic evolution of the northeastern Appalachians (Colman-Sadd et al 1992; van Staal 1994;van Staal et al 1996van Staal et al , 1998van Staal et al , 2003van Staal et al , 2009Hibbard et al 2006). These authors presented evidence that the Gander Zone of Williams (1979) formed part of a peri-Gondwanan microcontinent, referred to as Ganderia, which was separate from the Avalon Zone or Avalonia (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Basement rocks of the New River terrane trend toward coastal Maine, where they may underlie Penobscot volcanic rocks of the Ellsworth terrane (Stewart et al 1995;Fyffe et al 2009). The Ellsworth and New River terranes are cut internally by multiple faults constituting a large dextral transcurrent fault system that includes Acadian strike-slip duplexes of Late Silur-Copyright © Atlantic Geology, 2011 Fyffe et al -A review of Proterozoic to Early Paleozoic lithotectonic terranes … ian to Early Devonian age (Leger and Williams 1986;West et al 1992West et al , 1995Stewart et al 1995;Hibbard et al 2006;Lin et al 2007;van Staal et al 2009). …”

Section: New River 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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Section: Introductionmentioning

confidence: 99%

Section: New River Terranementioning

confidence: 99%

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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“…Because of its small size, most regional geological maps (e.g., Hibbard et al 2006) do not show Machias Seal Island. More detailed local maps have shown the island as Precambrian granite (e.g., Potter et al 1979) or Silurian-Devonian granite (e.g., McLeod et al 1994; New Brunswick Department of Natural Resources 2010).…”

Section: Introductionmentioning

confidence: 99%

Age and petrology of the Machias Seal Island quartz monzodiorite, the southernmost rocks in New Brunswick, Canada

Barr

Mortensen²,

White³

et al. 2010

atgeol

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Machias Seal Island in the northern Gulf of Maine consists of fine-to medium-grained weakly foliated quartz monzodiorite. Although previously inferred to be as young as Devonian, the quartz monzodiorite yielded an EdiacaranEarly Cambrian U-Pb (zircon) age of 542.0 ± 0.9 Ma. Typical Machias Seal Island quartz monzodiorite contains strongly zoned plagioclase (50%), about 30% mafic minerals (biotite and amphibole with relict cores of both orthoand clinopyroxene, and 20% interstitial quartz and orthoclase. The average chemical composition (5 samples) has 60.6% SiO 2 , with relatively high Al 2 O 3 (over 16%) and low K 2 O (2.8%). Overall, the chemical characteristics, including low Rb, Y, and Nb, are consistent with emplacement in a continental margin subduction zone. The quartz monzodiorite contains abundant ovoid metadioritic enclaves, likely of cognate origin. Age and compositional similarities strongly suggest correlation of Machias Seal Island quartz monzodiorite with the abundant ca. 550-525 Ma gabbroic to granitic plutons of the Brookville terrane on the mainland of southern New Brunswick. Its age is similar also to the ages of volcanic and some plutonic rocks on Grand Manan Island and in the New River terrane in mainland southern New Brunswick, strengthening the interpretation that all of these areas are part of Ganderia. Hence the Fundy Fault southeast of Machias Seal Island likely marks the boundary between Ganderia and Avalonia in the Gulf of Maine. RÉSUMÉL'île Machias Seal, dans la partie nord du golfe du Maine, se compose de monzodiorite quartzique à grains fins à moyens faiblement feuilletée. Même si on déjà présumé que son origine remonterait au Dévonien, une datation de la monzodiorite quartzique par la méthode U-Pb sur zircon a indiqué un âge d'Ediacara et du début du Cambrien, soit de 542,0 ± 0,9 Ma. Les minéralisations caractéristiques de monzodiorite quartzique de l'île Machias Seal renferment un plagioclase fortement zoné (50 p. 100), environ 30 p. 100 de minéraux mafiques (biotite et amphibole accompagnées de noyaux résiduels d'orthopyroxène et de clinopyroxène), ainsi que 20 p. 100 de quartz et d'orthoclase interstitiels. La composition chimique moyenne (5 échantillons) est de 60,6 p. 100 de SiO 2 , une teneur relativement élevée de Al 2 O 3 (plus de 16 p. 100) et une faible teneur en K 2 O (2,8 p. 100). Dans l'ensemble, les caractéristiques chimiques de ces minéralisations, y compris la faible teneur en Rb, Y et Nb, sont généralement associées à un emplacement dans une zone de subduction de la marge continentale. La monzodiorite quartzique contient d'abondantes quantités d'enclaves de métadiorite ovoïdes, vraisemblablement de la même origine. L'âge et les similitudes de composition de ces roches portent à croire qu'une corrélation pourrait s'établir entre la monzodiorite quartzique de l'île Machias Seal et la grande quantité de plutons gabbroïque à granitique de 550-525 Ma observée dans le socle de Brookville, dans la partie continentale du Sud du Nouveau-Brunswick. Par ailleurs, ces ...

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“…The Ganderia microcontinent consists of Late Neoproterozoic-Ordovician arc and associated clastic metasedimentary rocks, whereas Avalonia comprises sub-greenschist facies Neoproterozoic volcanic, plutonic and sedimentary rocks overlain by Cambrian-Ordovician platform cover sequences (Hibbard et al, 2006;van Staal et al, 2009;van Staal and Barr, 2012).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…to Ordovician Ganderian mylonitic paragneiss and orthogneiss (Hibbard et al, 2006), indicating a pre-or syn-kinematic emplacement. The host mylonite exhibits a pervasive NE-striking, dextral S-C' fabric with supporting sigma clast shearsense indicators (Fig.…”

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confidence: 99%

Influence of deformation and fluids on Ar retention in white mica: Dating the Dover Fault, Newfoundland Appalachians

Kellett

Warren

Larson

et al. 2016

Lithos

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Lithotectonic map of the Appalachian Orogen, Canada-United States of America

Cited by 136 publications

References 0 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

Age and petrology of the Machias Seal Island quartz monzodiorite, the southernmost rocks in New Brunswick, Canada

Influence of deformation and fluids on Ar retention in white mica: Dating the Dover Fault, Newfoundland Appalachians

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