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TitleSeismic stratigraphy of the lower St. Lawrence River estuary (Quebec) Quaternary deposits and seismic signature of the underlying geological domains
AuthorDuchesne, M J; Pinet, N; Bolduc, A; Bédard, K; Lavoie, D
SourceGeological Survey of Canada, Current Research (Online) 2007-D2, 2007, 14 pages,
PublisherNatural Resources Canada
Mediaon-line; digital
File formatpdf (Adobe® Reader®)
NTS22B/13; 22B/14; 22C/03; 22C/04; 22C/06; 22C/07; 22C/09; 22C/10; 22C/11; 22C/15; 22C/16; 22F/01; 22G/01; 22G/02; 22G/03; 22G/04; 22G/05; 22G/06; 22G/07; 22G/08; 22G/10; 22G/11; 22G/15
AreaSt. Lawrence River
Lat/Long WENS-70.0000 -66.0000 50.0000 48.0000
Subjectssurficial geology/geomorphology; geophysics; stratigraphy; basins; sedimentary basins; seismic surveys; seismic interpretations; seismic reflection surveys; sedimentation; submarine fans; submarine features; depositional environment; estuaries; estuarine deposits; estuarine studies; stratigraphic analyses; bedrock topography; Laurentian Channel; Quaternary
Illustrationssketch maps; seismic profiles; block diagrams
Released2007 11 01
AbstractThe lower St. Lawrence River estuary is a narrow Quaternary basin filled with several stacked sedimentary units. Recently, high-resolution seismic-reflection surveys conducted in the lower St. Lawrence River estuary permitted identification of eight seismic units overlying three lithotectonic domains with different seismic signatures. Units 1 and 2 have highly variable thickness and fill most of two major bedrock depressions that exist in the study area. Unit 3 is present over the entire lower St. Lawrence River estuary basin, partly infilling ponded basins found on the shoulders of the estuary. Units 4 and 5 have a more constant thickness, suggesting that they were deposited in a hemipelagic setting. Units 6, 7, and 8 result from local processes like the sedimentation of submarine fans, mass-wasting deposits, and contourite drifts occurring along the flanks of the Laurentian Channel. The thickness of the Quaternary succession shows a strong correlation with the bedrock topography, indicating that the lower St. Lawrence River estuary was an effective sediment trap.