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Bulletin of Canadian Petroleum Geology; March 2000; v. 48; no. 1; p. 19-29; DOI: 10.2113/48.1.19
© 2000 Canadian Society of Petroleum Geologists
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The Beaver River Structure: a cross-strike discontinuity of possible crustal dimensions in the southern Mackenzie Fold Belt, Yukon and Northwest territories, Canada

David W. Morrow

Geological Survey of Canada, 3303 - 33 Street NW, Calgary, AB ,T2L 2A7

Warner C. Miles

Geological Survey of Canada, 615 Booth Street, Ottawa, ON, K1A OE9

Une discontinuité structurale significative croisant la direction structurale, la Structure de Beaver River, a été reconnue prés de la frontiére entre la partie centre-nord de la chaîne de plissement de Mackenzie et sa partie sud, le plateau de Liard. La Structure de Beaver River est la continuation nord-est de la faille Beaver, vers la confluence des riviéres Nahanni Sud et Liard et dans la Plate-forme de l’Intérieur. Elle est orientée sub-parallélement à la Ligne Liard situéé plus au sud. Le mouvement dextre cumulatif d’âge Laramide de 10 â 20 km est inféré s’étre produit le long de la Structure de Beaver River. De petits rejets dextres se présentent le long de la faille de Beaver, une manifestation possible en surface de la Structure de Beaver River et de grands plis et failles d’âge Laramide, d’orientations â dominante nord-sud, comme les synclinaux de Kotaneelee et de Liard et la faille de chevauchement de Nahanni semblent avoir pivoté localement d’une fagon conforme â un décrochement dextre d’au moins 10 â 20 kilométres.

L’absence de strates du Permien et du Trias dans la chaine de chevauchement de Mackenzie au nord de la Structure de Beaver River indique peut-être que du soulévement et de l’érosion se sont produits au nord de la Structure de Beaver River pendant l’orogénése du Colombien. I1 est probable que la Structure de Beaver River est une ancienne structure, possible du Précambrien, qui a été réactivée plusieurs fois tout au long de la période Phanérozoïque.

Traduit par Lynn Gagnon




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