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TitleTremblements de terre et failles de l'astroblème de Charlevoix (Québec)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorNadeau, L; Lamontagne, MORCID logo; Brouillette, P; Locat, J; Castonguay, SORCID logo; Morin, A
SourceGeological Survey of Canada, Open File 8809, 2021, 46 pages (1 sheet), Open Access logo Open Access
PublisherNatural Resources Canada
MeetingES-SSA 2013, 85th Annual Meeting of the Eastern Section of the Seismological Society of America; La Malbaie, QC; CA; October 6-8, 2013
Documentopen file
MapsPublication contains 1 map
Map Info.geological, regional geology, 1:200,000
Mediaon-line; digital
RelatedThis publication is a translation of Earthquakes and faults of the Charlevoix Impact Structure, Quebec
File formatpdf
NTS21M/07; 21M/08; 21M/09; 21M/10; 21M/15; 21M/16
AreaSt. Lawrence River; Monts-des-Éboulements; La Malbaie; Baie Saint-Paul
Lat/Long WENS -70.7500 -69.5000 48.0000 47.0000
Subjectsregional geology; structural geology; stratigraphy; geophysics; geochronology; Nature and Environment; Science and Technology; Health and Safety; seismology; earthquakes; seismic risk; earthquake risk; tectonic setting; rifts; bedrock geology; structural features; meteorite craters; faults; grabens; terraces; troughs; lithology; metamorphic rocks; paragneisses; orthogneisses; migmatites; charnockites; mangerites; igneous rocks; intrusive rocks; granitic rocks; diorites; anorthosites; leucogabbros; breccias; shatter cones; metamorphism, shock; radiometric dating; argon argon dating; uranium lead dating; field relations; digital terrain modelling; remote sensing; satellite imagery; geophysical interpretations; magnetic interpretations; gravity interpretations; gravity anomalies; bouguer anomalies; landslides; in-field instrumentation; Charlevoix Impact Structure; Charlevoix Seismic Zone; Iapetus Ocean; Logan's Line; Appalachian Orogen; Canadian Shield; Mesoproterozoic; landslide escarpments; Phanerozoic; Paleozoic; Ordovician; Precambrian; Proterozoic
Illustrationsdigital elevation models; block diagrams; tables; location maps; geoscientific sketch maps; satellite images; schematic cross-sections; photographs; stratigraphic columns
ProgramPublic Safety Geoscience Intraplate Earthquakes
Released2021 09 07
AbstractThis field guide was first written for the meeting of the Eastern Section of the Seismological Society of America (ES-SSA), held in La Malbaie in 2013. It has been slightly modified, mostly with new figures.
The Charlevoix Seismic Zone is the locus of the highest seismic hazard in continental eastern Canada. At the heart of this zone is the ~54 km diameter Charlevoix impact structure. This structure, located less than 125 km east of Quebec City, is one of the most accessible large meteorite impact structures in eastern North America. The Charlevoix impact structure is singled out as it overprints Iapetus rift faults and the Logan's Line marking the edge of the Appalachian Orogen.
The Charlevoix impact structure gives the region its singular landscape. The ~5 km wide peripheral ring trough forms a prominent open valley extending from St. Lawrence River (sea level) to a threshold at ~250 m altitude. The highest point in the valley is nearly 850 m below the ~1100 m mean elevation of the external Laurentian plateau. The highest point is also 550 m below the central uplift, 'Mont-des-Éboulements,' which stands 780 m above sea level. The overall morphology of the Charlevoix impact structure matches that of a complex impact crater. Shatter cones, mylolisthenite injections and shock-induced planar deformation microstructures in quartz and feldspar are widespread providing compelling evidence for the extent of shock metamorphism. The age of the impact is poorly constrained. Recently acquired 40Ar/39Ar and U-Pb data from impact melt rock and pseudotachylite give a late-Ordovician age, which appears to be in better agreement with field relationships than the previously reported K-Ar Devonian-age.
Summary(Plain Language Summary, not published)
This field guide describes some of the most important geological and geophysical features of the Charlevoix Seismic Zone. The Zone is the locus of the highest seismic hazard in continental eastern Canada. At the heart of this zone is the ~54 km diameter Charlevoix impact structure. In addition, numerous faults of regional extent cut through the geological formations.

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