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TitreGaspé Belt subsurface geometry in the northern Québec Appalachians as revealed by an integrated geophysical and geological study: 2- Seismic interpretation and potential field modelling results
AuteurPinet, N
SourceTectonophysics vol. 588, 2013 p. 100-117,
Séries alt.Secteur des sciences de la Terre, Contribution externe 20120353
Documentpublication en série
Mediapapier; en ligne; numérique
Référence reliéeCette publication est reliée à Pinet, N; Lavoie, D; Keating, P; Brouillette, P; (2008). Gaspé belt subsurface geometry in the northern Québec Appalachians as revealed by an integrated geophysical and geological study: 1- Potential field mapping, Tectonophysics vol. 460
SNRC22A; 22B; 22G/01; 22G/02; 22H/01; 22H/02; 22H/03; 22H/04
Lat/Long OENS-68.0000 -64.0000 49.5000 47.5000
Sujetsanalyses géométriques; géométrie du bassin; levés géophysiques; interprétations géophysiques; interpretations sismiques; levés de reflexion sismiques; géologie du substratum rocheux; caractéristiques structurales; failles; zones tectonostratigraphiques; levés gravimétriques; levés aéromagnétiques; Ceinture de Gaspe ; géophysique; géologie structurale; Carbonifère; Silurien; Dévonien; Paléozoïque
Illustrationslocation maps; cross-sections; stratigraphic columns; profiles
ProgrammeAnalyse des bassins frontaliers, Les géosciences pour les nouvelles sources d'énergie
Résumé(disponible en anglais seulement)
Geological information, seismic reflection profiles and potential field data are used to study the geometry of the Middle Paleozoic Gaspé Belt (eastern Canada) that has been interpreted in variousways in the past. On thewestern edge of the Gaspé Belt, in the Matapédia area, growth strata are imaged on seismic profiles and testify of normal (or transtensional) motion during the period spanning the Silurian (and possibly Late Ordovician) to earliest Devonian along several faults, including the Shickshock-Sud Fault. In this area, Acadian deformation during the Middle to Late Devonian is associated with relatively modest shortening (less than 20%) accommodated by broad open folds, steeply-dipping neo-formed faults and inversion of previously formed faults. Neo-formed faults cut the entire Middle Paleozoic succession and offset the Ordovician Taconian unconformity suggesting that no sedimentary interval acted as an efficient décollement level. Toward the SE, the Sainte-Florence Fault divides rock assemblages with different paleogeographic settings and structural styles. Increase in tectonic complexity and amount of shortening to the south of the fault is interpreted as resulting of a vise effect between two basement blocks.