Transatlantic correlation of the Variscan-Appalachian orogeny

Rast, N.; Grant, Richard E.

doi:10.2475/ajs.273.7.572

Cited by 49 publications

(22 citation statements)

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“…2). Both dextral strike-slip and thrust displacement is known to have occurred on this fault during the Late Silurian -Early Devonian and in the Carboniferous (Rast and Grant 1973;Nance 1986a;Léger and Williams 1986;Park et al 1994). The Late Silurian -Early Devonian displacement may have been associated with accretion of the Avalonian Caledonia Terrane to Ganderia by northwestward subduction of the Avalonian plate beneath the Silurian Kingston arc and Mascarene backarc basin (Fyffe et al 1999;White et al 2006;van Staal et al 2009).…”

Section: Tectonic Evolution Of the Grand Manan 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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Section: Tectonic Evolution Of the Grand Manan 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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“…However, in the same area, Lower Carboniferous strata rest with an angular unconformity on rocks which have been deformed in a Lower' Paleozoic, presumably Acadian (of Brown 1972) orogeny. Several workers have postulated that movements on certain faults in the Belleisle system have occurred in pre-, syn-and post-Acadian time (Garnett 1973, Wardle andO'Brien 1973;Rast and Grant 1974). MacKenzie (1964) thought that the primordial Belleisle fault in the Long Reach area was active in the Silurian and acted as a channel for magma.…”

Section: Relationships Between the Coldbrook Group And Rocks Of Middlmentioning

confidence: 99%

“…The folded belt is a part of a larger zone in Maritime Canada, which has been variously interpreted as a mobile belt (Poole 1967), a zone underlain by salt dome piercement structures (Van de Poll 1972) and an overthrust zone related to an orogenic front (Rast and Grant 1973). The deformed zone occurs along the southeast margin of the Kennebecasis Bay anticlinorium and does not cross the older structural grain.…”

Section: Relationships Between Lower Carboniferous Rocks and The Coldmentioning

confidence: 99%

“…To the south within the deformed belt the pre-Carboniferous rocks in the anticlinorium simply appear as some of the stratigraphic elements in the overthrust zone. The variation in the type of tectonic mobilization of the pre-Carboniferous basement is probably a signature of the presence of an orogenic thrust front (of Rast and Grant 1973).…”

Section: Relationships Between Lower Carboniferous Rocks and The Coldmentioning

confidence: 99%

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The Persistance and Longevity of Faults in the Crustal Evolution of Southern New Brunswick

O'Brien

1977

atgeol

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“…Recently, Rast and Grant (1973) proposed the extension of the Variscan Thrust Front of Wales into southwestern New Brunswick and further suggested that this zone of deformed Mississippian rocks, having an average strike of 55° to 60°, may reach into the Caledonia area as well. Rast and Grant (1973) argue that the predominantly flat-lying cleavage, in the Caledonia area which steepens as the front is approached accords well with the idea of overthrusting from the southeast.…”

Section: Structural Geologymentioning

confidence: 99%