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The AAPG/Datapages Combined Publications Database

CSPG Bulletin

Abstract


Bulletin of Canadian Petroleum Geology
Vol. 33 (1985), No. 1. (March), Pages 22-30

Intercutaneous Wedges, the Triangle Zone and Structural Thickening of the Mynheer Coal Previous HitSeamNext Hit at Coal Valley in the Rocky Mountain Foothills of Central Alberta

H.A.K. Charlesworth, L.G. Gagnon

ABSTRACT

Throughout orogenesis the most external structural units in the Rocky Mountain Foothills of central Alberta were intercutaneous wedges. Each wedge tapered northeastward and was bound upward and downward by southwest- and northeast-verging thrusts, respectively. The triangle zone consists mainly of horses that accreted at the bases of such wedges. Duplexes made up of these horses occur at a wedge's northeastern extremity. Thickening of the Mynheer coal Previous HitseamNext Hit at Coal Valley has resulted from the formation of duplexes, each of whose floor and roof thrusts follow the bottom and top of the Previous HitseamNext Hit. Vertical stacking of these duplexes has given rise to thicknesses of up to 20 times the stratigraphic thickness of 4.2 m. The thickened Previous HitseamTop occurs at the extremity of an intercutaneous wedge that moved northeastward about 2.5 km with respect to adjacent strata.

PRISMES INTERCUTANES, ZONE TRIANGULAIRE ET EPAISSISSEMENT STRUCTURAL DE LA VEINE DE CHARBON MYNHEER DE COAL VALLEY (FOOTHILLS DE L'ALBERTA CENTRAL)

RESUME

Lors de la formation de la chaine des Montagnes Rocheuses, les unites structurales les plus externes etaient, dans les Foothills de l'Alberta central, des prismes intercutanes. Chaque prisme s'amincissait vers le nord-est et etait limite vers le haut et vers le bas par des chevauchements a vergence respectivement sud-ouest et nord-est. La zone triangulaire est formee principalement d'elements chevauchants empiles a la base de tels prismes. Ces empilements forment des duplex qui sont bien developpes a l'extremite nord-est des prismes. L'epaississement de la veine de charbon Mynheer de Coal Valley est le resultat de la formation de ces duplex. A l'interieur de chacun d'eux, les chevauchements se localisent au toit et a la base de la veine. L'empilement vertical de ces structures a permis de multiplier jusqu'a 20 la puissance stratigraphique de 4,2 m de la veine. Cette veine epaissie se trouve a l'extremite d'un prisme intercutane deplace vers le nord-est d'environ 2,5 km par rapport aux strates adjacentes.

Traduit par B. Collot


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