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TitreStructural evolution of the Thetford Mines Ophiolite Complex, Canada: implications for the southern Québec ophiolitic belt
AuteurSchroetter, J -M; Bédard, J H; Tremblay, A
SourceTectonics vol. 24, no. 1, TC1001, 2005, 20 pages, https://doi.org/10.1029/2003TC001601 (Accès ouvert)
Année2005
Séries alt.Secteur des sciences de la Terre, Contribution externe 2005286
ÉditeurWiley-Blackwell
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1029/2003TC001601
Mediapapier; en ligne; numérique
Formatspdf
ProvinceQuébec
SNRC21E/04; 21E/05; 21E/06; 21E/10; 21E/11; 21E/12; 21E/13; 21E/14; 21E/15; 21L; 31H/01; 31H/02; 31H/03; 31H/06; 31H/07; 31H/08; 31H/09; 31H/10; 31H/11; 31H/14; 31H/15; 31H/16; 31I/01; 31I/02; 31I/08
Lat/Long OENS -73.5000 -70.0000 47.0000 45.0000
Sujetsophiolites; roches ignées; roches volcaniques; roches métamorphiques; roches sédimentaires; caractéristiques structurales; failles; granites; sediments; ardoises; calcaires; grès; conglomérats; mudstones; silstones; basaltes; quartzites; phyllites; olistostromes; schistes; failles normales; obduction; roches ultramafiques; intrusions; filons rocheux; failles, extension; expansion océanique; zones de subduction; bassins; zone de roches métamorphiques; marges continentales; aureoles de métamorphisme; mise en place; plis; failles, chevauchement; failles inverses; antécédents tectoniques; lithosphère océanique; anticlinaux; synclinaux; déformation; flysch; tufs volcaniques; roches plutoniques; faciès; dunites; pyroxénites; gabbros; diabases; harzburgites; manteau terrestre; amphibolites; laves; brèches; turbidites; tectonites; foliation; formation de fissures; roches sédimentaires métamorphosées; serpentinites; litage; schistosité; clivage; grenat; péridotites; chromitites; modèles; analyse cinématiques; arcs magmatiques; lithologie; analyses géochimiques; Ceinture ophiolotique du sud de Québec; Complexe de Thetford Mines Ophiolite ; Complexe d'Asbestos Ophiolitic ; Complexe de Mont Orford Ophiolitic ; Zone de Dunnage ; Groupe de Magog ; Complexe d'Ascot ; Mélange de St-Daniel ; Zone d'Humber ; Orogène Appalachien; Anticlinorium de Notre-Dame Mountains ; Anticlinorium de Sutton Mountains ; Faille de Brome ; Faille de Saint-Joseph ; Faille de Bennett ; Faille de la Guadeloupe ; Ligne de Logan's ; Orogène Taconien; Formation de Beauceville ; Formation de Saint-Victor ; Groupe de Rosaire ; Groupe de Caldwell ; Schistes de Bennett; Anticlinal de Becancour ; Anticlinal de Carineault ; Orogenèse Acadienne; Massif de Thetford Mine ; Massif d'Adstock-Ham; Mine Reed-Belanger ; Mine Nadeau ; Mine Normandie ; Mine Beaver ; Mine American Chrome ; Mine Jeffrey ; Massif de Lac Brompton ; Massif de Mont-Chauve ; Massif de Mont-Orford-Mont-Chagnon ; Massif de Mont-Adstock-Mont-Ham ; géologie structurale; tectonique; pétrologie ignée et métamorphique; Phanérozoïque; Paléozoïque; Carbonifère; Dévonien; Silurien; Ordovicien; Cambrien
Illustrationsgeological sketch maps; location maps; schematic diagrams; sketches; photographs; cross-sections; models
ProgrammeCRSNG Conseil de recherches en sciences naturelles et en génie du Canada
ProgrammeValorisation-Recherche Québec, Diversification de l'exploration minérale au Québec
Diffusé2005 01 11
Résumé(disponible en anglais seulement)
The Thetford Mines Ophiolite Complex (TMOC) preserves a complete ophiolitic sequence, and occupies the hanging wall of a major SE dipping normal fault, the Saint-Joseph fault. Preobduction, synobduction, and postobduction structures can be recognized in the TMOC. NS trending, preobduction, paleonormal faults are parallel to ultramafic minor intrusions, and to sheeted dykes, recording extension related to seafloor-spreading in a pericontinental suprasubduction zone basin. WNW trending synobduction, synmetamorphic fabrics are found toward the base of the TMOC and in the underlying continental margin rocks, but are absent in the upper part of the TMOC and overlying sedimentary rocks. These Ordovician (Taconian) structures record the development of a dynamothermal aureole immediately below the mantle/margin contact, and emplacement of the young ophiolite onto the continental margin. Postobduction structures include Late Silurian/Early Devonian, SE verging backthrusts and back folds that inverted the TMOC; and Middle Devonian (Acadian) NW verging folds and reverse faults. The tectonic history established for the TMOC is consistent with that of the adjacent Laurentian margin, and can be applied to the southern Québec ophiolitic belt as a whole. The structural synthesis of the ophiolitic belt, complemented with new observations and our compilation of stratigraphical, geochemical, geochronological, and petrological data, suggests that the southern Québec ophiolites may represent the remnants of the obduction of a single large slab of suprasubduction oceanic lithosphere extending for over a 100 km of strike length.
GEOSCAN ID221068