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TitleAppalachian foreland basin of Canada
AuthorLavoie, D
SourceSedimentary basins of the United States and Canada; by Miall, A D (ed.); Sedimentary basins of the world vol. 5, 2008 p. 65-103,
Alt SeriesGeological Survey of Canada, Contribution Series 2002032
Mediapaper; on-line; digital
File formathtml; pdf (Adobe® Reader®)
ProvinceNew Brunswick; Quebec; Newfoundland and Labrador
AreaGaspé Peninsula; northern New Brunswick; western Newfoundland; Saguenay; St. Lawrence River; Gulf of St. Lawrence
Subjectstectonics; structural geology; stratigraphy; fossil fuels; bedrock geology; tectonostratigraphic zones; tectonic elements; tectonic evolution; tectonic stages; continental margins; plate margins; rifting; orogenies; deformation; subsidence; basins; basin evolution; depositional history; sedimentation; sedimentary environments; paleo-sea levels; sea level changes; transgressions; regressions; structural features; faults; folds; anticlines; synclines; paleogeography; stratigraphic correlations; petroleum resources; hydrocarbon potential; flysch; sedimentary rocks; conglomerates; sandstones; mudstones; calcarenites; limestones; shales; clastics; dolostones; olistostromes; turbidites; sedimentary wedges; unconformities; Appalachian Province; Laurentia; Gaspé Belt; Baie Verte-Brompton Line; Appalachian Structural Front; Saguenay Graben; Oak Hill Group; Clam Bank Belt; Logan's Line; Taconian Orogeny; Salinic Orogeny; Acadian Orogeny; Neoacadian Orogeny; Alleghanian Orogeny; Humber Zone; Dunnage Zone; Ottawa-Bonnechere Graben; St. Lawrence Promontory; Quebec Reentrant; St. Lawrence Platform; Round Head Thrust Fault; Garden Hill oil field; Red Island Thrust Fault; St. George Thrust Fault; Tea Cove Thrust Fault; Salinic unconformity; Chaleurs Bay Synclinorium; Aroostook-Percé Anticlinorium; Connecticut Valley-Gaspé Synclinorium; Gaspé Sandstones; Upper Gaspé Limestones; Chaleurs Group; Honorat Group; Matapédia Group; St Francis Group; Frontenac Formation; Port au Port Group; Cow Head Group; Northern Head Group; Potsdam Group; Philipsburg Group; Beekmantown Group; St. George Group; Lac St-Jean Outlier; foreland basins; collisions; basin filling; passive margins; Phanerozoic; Paleozoic; Devonian; Silurian; Ordovician; Cambrian; Precambrian; Proterozoic
Illustrationsgeochronological charts; sketch maps; stratigraphic charts; stratigraphic columns; stratigraphic correlations; seismic sections; cross-sections
AbstractThe Late Proterozoic breakup of Rodinia led to the formation of Laurentia. The continent had a paleosouthern jagged margin that consisted of recesses and salients; the Canadian segment of that margin belongs to the St. Lawrence Promontory and Quebec Reentrant.
The stratigraphic framework and paleogeographic evolution of Cambrian-Ordovician shallow- to deep-marine units deposited during the rift, passive-margin and foreland-basin stages are integrated from western Newfoundland to southern Quebec. Major sea-level lowstands and highstands are correlated, with some time discrepancy starting to occur in earliest Ordovician. The passive-margin evolution was primarily controlled by eustatic sea-level changes; although some ancestral faults were sporadically active in Late Cambrian to Early Ordovician in the Quebec Reentrant. The diachronous westerly directed late Early to Late Ordovician tectonic-controlled extensional collapse of the shallow-marine foreland shelf from the St. Lawrence Promontory to the Quebec Reentrant was followed by the diachronous collision of volcanic arcs along Laurentia (Taconian Orogeny) which climaxed in the Middle-Late Ordovician interval with collision occurring first at the St. Lawrence Promontory.
Tectonic quiescence was short-lived along the paleosouthern continental margin of Laurentia as more exotic microcontinents (Ganderia, Avalonia) were closing in. The paleoenvironmental history was significantly affected by these Early Silurian to late Early Devonian tectonic events (Salinic and Acadian orogenies). A Late Ordovician to Early Silurian filling stage was followed by two T-R cycles. The first of these cycles was initiated by a tectonically controlled sea-level rise in latest Early Silurian followed by a eustatic sea-level fall in Late Silurian. The cycle culminated in the Salinic unconformity. The second cycle started with a major tectonic collapse in latest Silurian followed by a slow to ultimately rapid sea-level fall from the Early to early Middle Devonian. The cycle ended with sub-aerial exposure and syn-tectonic
sedimentation (Acadian Orogeny).

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