Plate Tectonic Evolution of the Canadian Appalachian Region

Poole, W H

doi:10.4095/104087

Cited by 24 publications

(29 citation statements)

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“…One proposed scenario of evolution of AVM is the following: 1) formation of an intracontinental basin or continental margin (Poole 1976) , 2) long-lived Hadrynian continental extension (King 1979), 3) local rupture(s) and sea floor spreading by very late Precambrian to early Cambrian (Williams 1979 separated microcontinents by CambroOrdovician time, 5) ongoing extension on detaching miniplates during the lower Paleozoic time up to the middle Devonian.…”

Section: Discussionmentioning

confidence: 99%

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Paleomagnetism of mafic dikes from the Avalon Peninsula, eastern Newfoundland

Séguin

Gahé

Khalfi

1982

atgeol

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As part of a major study of the Avalon zone in eastern Newfoundland, we describe the palromagnetism of two series of dikes located in the Bauline and Colliers-Harbour Main areas, respectively. Detailed alternating field (AF) and thermal experiments performed on these dikes indicate that they are characterized by two significantly different mean directions of magnetization: SE++(D = 153°, I = +62°; K = 46, N = 12 sites) and SW (D = 217°, I = +58°, K = 58, N = 12 sites ) with corresponding paleopole positions at A (4°N, 34°W; dp,dm = 8°, 10°) and C (2°N, 81°W; dp, dm = 6°, 9°). Antipoles A and C are located in southerly latitudes, and a comparison with other poles of Avalonian rocks from New Brunswick, Nova Scotia and Newfoundland indicates a Silurian to Siluro-Devonian age for these dikes. Poles A and B are interpreted as representing rapid apparent polar wander with respect to eastern Newfoundland during Silurian time. Two components of magnetization, corresponding to two distinct geological events, are observed in the dikes investigated and this situation favours the following geological scenario for the evolution of the Avalon microcontinent: ; dp,dm = 8°,10°) et C (2°N, 81°0; dp,dm = 6°, 9°). Les antipoles A et C se situent a des latitudes meridionales et par comparaison avec d'autres poles de roches avaloniennes du Nouveau-Brunswick, de la Nouvelle-Ecosse et de Terre-Neuve, on attribue aux dykes un age Silurien a Siluro-Devonien. On interprete les poles geomagnetiques A et B comme le resultat de deplacements rapides du pole par rapport avec l'est de Terre-Neuve durant le Silurien. On observe dans ces dykes deux composantes de magnetisation, correspondant a deux evenements geologiques distincts. Ceci suggere le scenario suivant pour expliquer l'evolution du microcontinent Avalon: (a) un rift intracratonique qui se traduit par une longue periode d'extension continentale depuis l'Hadrynien tardif jusqu'au Cambrlen; (b) du Silurien jusqu'au debut du Devonien, une phase tardive de distension lors de la separation des miniplaques.

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Section: Discussionmentioning

confidence: 99%

“…These rocks were labelled "Avalonian", after the Avalonian Peninsula of eastern Newfoundland (Kay 1967, Poole 1967 where they are typically exposed. Detailed studies in the eastern Avalon Peninsula have been carried out by Papezik (1972), Nixon and Papezik (1979) and King (1979).…”

Section: Introductionmentioning

confidence: 99%

Paleomagnetism of mafic dikes from the Avalon Peninsula, eastern Newfoundland

Séguin

Gahé

Khalfi

1982

atgeol

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“…However, ir. Nova Scotia, middle to late Ordovician and Silurian rocks most probably occur in a southerly thickening basin called the Meguma Trough (of Poole 1967Poole , 1976. The Halifax Formation of the Meguma Group is, in part, Tremadocian (Taylor 1967) and is, though not everywhere, con-' formably succeeded by the White Rock, Kentville and New Canaan formations.…”

Section: Relationships Between the Coldbrook Group And Rocks Of Middlmentioning

confidence: 99%

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

O'Brien

1977

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“…The formation of depocentres within the Maritimes Basin (Williams 1974) during the Late Palaeozoic was initiated at the close of the Acadian orogeny (Poole 1967), following the Caledonian orogeny in western Europe, which together record the final closure of the Iapetus Ocean (McKerrow 1988). The earliest basin-fill, recorded in the McAdam Lake Formation on Cape Breton Island, has been assigned a Lower or Middle Devonian age on the basis of its Arthrostigma-Psilophyton macroflora (Bell & Goranson 1938) but is better constrained to the latest Emsian to early Eifelian age on the strength of palynomorphs (McGregor 1977).…”

Section: Beginnings: Middle -Upper Devonianmentioning

confidence: 99%

“…The Maritimes Basin is a complex of predominantly northeasterly trending intermontane basins, once variously interconnected and now, as then, defined by intervening massifs of the Avalon, Grenville and Meguma terranes. The basin was born of the Devonian (Emsian) Acadian orogeny (Poole 1967), contemporary of the latest stage of the Caledonian orogeny, both of which record final closure of the Iapetus Ocean (McKerrow 1988). The Carboniferous evolution of the Maritimes Basin bears witness to the nativity of Pangaea as Gondwana and numerous platelets of suspect terrane collided with Laurasia and the Old Red Continent, manifested in the Hercynian and Alleghenian orogenies (Schenk 1981;Rast 1988).…”

Section: Geological Setting: the Maritimes Basin In Euramericamentioning

confidence: 99%