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The AAPG/Datapages Combined Publications Database

CSPG Bulletin

Abstract


Bulletin of Canadian Petroleum Geology
Vol. 39 (1991), No. 2. (June), Pages 210-210

"Tertiary Structural Evolution of the Previous HitBeaufortNext Hit-Mackenzie Basin [Abstract]"

Dietrich, J.R.1, Lane, L.S.1

ABSTRACT

Previous HitBeaufortNext Hit-Mackenzie Basin sediments of Late Jurassic to Tertiary age were shortened in an arcuate trend during Tertiary Brookian orogenesis. A major pulse of Early Eocene folding and thrust faulting affected much of the central and western Previous HitBeaufortNext Hit-Mackenzie Basin. Concurrent longitudinal normal faulting occurred on land, in the western Previous HitBeaufortNext Hit and near the southeast basin margin (Taglu fault zone). A second major orogenic pulse of Miocene age caused deformation concentrated in the distal part of the deformed belt, in Demarcation subbasin-Herschel high, and between the Taglu and Tarsiut-Amauligak fault zones. A large area of southwestern Previous HitBeaufortTop-Mackenzie Basin was largely undeformed by this pulse but was transported basinward on a decollement zone(s). Seismic images of many offshore structures show obvious asymmetry; other structures are clearly detached. Onshore, important decollement horizons occur at several stratigraphic levels. Concurrent extension occurred principally in the Tarsiut-Amauligak fault zone.

In general, the deformation shows a foreland-younging trend, away from the craton. Temporal and spatial variations in tectonic shortening require secondary accommodation by right-lateral transcurrent faulting, concentrated along the southeast basin margin and in a zone trending northeastward from near Kay Point through the Tarsiut area. Although minor at the basin scale, transcurrent faulting may be locally very significant at the scale of individual prospects.

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ACKNOWLEDGMENTS AND ASSOCIATED FOOTNOTES

1 Geological Survey of Canada, Calgary, Alberta T2L 2A7

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