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TitreMarine geology of the St. Lawrence Estuary
AuteurSt-Onge, G; Duchesne, M J; Lajeunesse, P
SourceIOP Conference Series: Materials Science and Engineering vol. 14, no. 1, 012003, 2011 p. 1-13, https://doi.org/10.1088/1755-1315/14/1/012003 (Accès ouvert)
Année2011
Séries alt.Secteur des sciences de la Terre, Contribution externe 20100413
ÉditeurIOP Publishing
RéunionIOP Conference; Brisbane; AU; juin 23-26, 2011
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1088/1755-1315/14/1/012003
Mediapapier; en ligne; numérique
Formatspdf
ProvinceQuébec
Lat/Long OENS-70.5833 -66.9167 49.3333 47.3333
Sujetssédiments marins; sédiments marins; milieux marins; milieu sédimentaire; sedimentation; débit de sedimentation; topographie du fond océanique; topographie du fond océanique; trous; géologie marine; Cénozoïque; Quaternaire
Illustrationslocation maps; profiles; cross-sections; graphs; plots
ProgrammeLa géoscience pour les développements extracôtiers de la côte est, Géoscience en mer
Diffusé2011 05 20
Résumé(disponible en anglais seulement)
The St. Lawrence Estuary, Eastern Canada, contains a very thick (>450 m) Quaternary sedimentary sequence. The results from recently conducted geophysical surveys in conjunction with piston coring indicate that these sediments were deposited under very high sedimentation rates, sometimes as high as ~30 m/ka during the last deglaciation. Results also reveal evidence of large submarine landslides during the Holocene, changes in sedimentation rates and the significant role of submarine canyons and channels to transfer sediments from the coast to the deeper marine environment. Finally, this paper highlights the presence of more than 1900 pockmarks on the seafloor of the St. Lawrence Estuary and discusses their possible origins: active hydrocarbon seeps in the Laurentian Channel and biogenic gas seepage on the northwestern shoulder of the Laurentian Channel.
GEOSCAN ID287834