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TitreGeology of the Toad River area (NTS 94N), northeast British Columbia
AuteurMcMechan, M; Ferri, F; MacDonald, L
SourceBritish Columbia Ministry of Energy, Mines and Petroleum Resources, Geoscience Reports 2012, 2012 p. 17-40 (Accès ouvert)
LiensOnline - En ligne
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110326
Documentpublication en série
Lat/Long OENS-126.0000 -124.0000 60.0000 59.0000
Sujetsgéologie du substratum rocheux; roches sédimentaires; schistes; silstones; grès; calcaires; caractéristiques structurales; plis; failles; hydrocarbures; capacité de production d'hydrocarbures; Formation de Besa River ; Formation de Toad ; Formation de Grayling ; Formation de Garbutt ; Formation de Buckinghorse ; Formation de Tuchodi ; Groupe de Kechika ; Formation de Nonda ; Formation de Muncho-mcconnell ; Formation de Stone ; Formation de Dunedin ; Formation de Mattson ; Formation de Kindle ; Formation de Tika ; Formation de Fantasque ; Formation de Liard ; Formation de Baldonnel ; Formation de Pardonet ; Formation de Chinkeh ; Formation de Scatter ; Formation de Lepine ; Formation de Sikanni ; Formation de Sully ; Formation de Dunvegan ; Formation de Kotaneelee ; Formation de Wapiti ; stratigraphie; géologie structurale; Paléozoïque; Cambrien; Ordovicien; Silurien; Mississippien; Carbonifère; Permien; Trias; Jurassique; Crétacé; Mésozoïque
Illustrationslocation maps; photographs; cross-sections
Programmebassins sédimentaires du Yukon, GEM : La géocartographie de l'énergie et des minéraux
Résumé(disponible en anglais seulement)
Regional mapping within the Toad River map area (NTS 094N) during the summer of 2011 will be incorporated with published and unpublished geological studies, including the unpublished detailed mapping along the Liard River corridor for BC Hydro, to update the geological database of this map area. More than 8000 m of strata spanning the Mesoproterozoic to Upper Cretaceous occur in the area. Abrupt changes in thickness and facies, and the local absence of specific stratigraphic intervals indicate that block faulting was active during the Middle Cambrian, Ordovician to Silurian, Mississippian to Permian, and Jurassic to Early Cretaceous (pre-Albian). These early faults were commonly reactivated during Cretaceous shortening and controlled the trend and position of younger structures. Thrust faulting is the dominant form of shortening within the competent Mesoproterozoic to Paleozoic successions, whereas detachment folding is the prevailing mechanism within the interlayered competent and incompetent Upper Devonian to Cretaceous successions. Principal detachment horizons include Upper Devonian to Mississippian shale of the Besa River Formation, Triassic shale and siltstone of the Toad/Grayling formations and shale of the Lower Cretaceous Buckinghorse and Garbutt formations. Shortening at the top of the Triassic in the eastern part of the Rocky Mountain Foothills near the Toad River is estimated to be approximately 5 - 6 km. Shortening at the top of the Triassic across the eastern part of the Liard Fold and Thrust Belt is even less. Hydrocarbon resources occur within large, structural culminations of the Beaver River and Crow River gas fields. In addition, the Paleozoic and Mesozoic successions contain several organic-rich horizons (Besa River Formation, Toad/Grayling formations and Garbutt Formation) that are stratigraphically equivalent to sequences being developed for shale gas resources elsewhere within the Western Canada Sedimentary Basin.