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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 donnees stratigraphiques et geochronologiques U–Pb obtenues recemment indiquent que les roches pretriasiques du terrane de Grand Manan du cote est de l’ile Grand Manan peuvent etre repartis en: 1) sequences sedimentaires quartzeuses et carbonatees du Neoproterozoique moyen (Cryogenien tardif) (formations de Thoroughfare et de Kent Island); 2) sequence d’arc volcanique du Neoproterozoique tardif (Ediacarien precoce) (formation d’Ingalls Head); 3) sequences sedimentaires et d’arc volcanique du Neoproterozoique tardif (milieu de l’Ediacarien) au tout debut du Cambrien (Terreneuvien precoce) (formations de Great Duck Island, Flagg Cove, Ross Island, North Head, Priest Cove et Long Pond Bay). Une comparaison avec des terranes du Precambrien 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 sequences sedimentaires et volcaniques du terrane de Grand Manan se sont deposees sur la marge continentale d’un bassin oceanique precambrien qui s’est ouvert durant la fracturation de la Rodinia au Neoproterozoique moyen (Cryogenien) et s’est ferme au Cambrien precoce (Terreneuvien) avec l’assemblage final du Gondwana. La distension continentale associee a l’ouverture initiale de l’ocean Iapetus au Paleozoique a commence au Neoproterozoique tardif (Ediacarien tardif) et a donc partiellement coincide avec la fermeture de l’ocean precambrien du Gondwana. La marge sud-est de l’ocean Iapetus est definie par d’epaisses sequences de sediments cambriens riches en quartz (dans les terranes de St. Croix et de Miramichi du Nouveau-Brunswick) issus en grande partie du recyclage de roches sedimentaires de la marge continentale passive du Precambrien preservees dans les terranes de Grand Manan et de Brookville au Nouveau-Brunswick et dans le terrane d’Islesboro dans le Maine. Ces terranes precambriens sont interpretes comme la representation de vestiges, ayant subi un deplacement dextre, du socle de la marge continentale gondwanienne de l’ocean Iapetus, ce qui concorde avec le modele d’un systeme appalachien a deux cotes propose par Hank Williams en 1964 sur la base de ses travaux a Terre-Neuve.

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