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Structural geology in the eastern margin of the canadian rocky mountains

Clinton D. A. Dahlstrom
Structural geology in the eastern margin of the canadian rocky mountains
Bulletin of Canadian Petroleum Geology (1970) 18 (3): 332-406


Hydrocarbon accumulations in the "foothills" at the eastern margin of the Canadian Rocky Mountains are structurally trapped. Exploration for them entails predicting the deep geometric configuration of potential reservoir beds in imperfectly understood areas. This prediction is commonly derived from analogies with the most appropriate of the region's typical structures, a pragmatic approach which is effective because the "foothills" contain a limited suite of relatively simple structural types: Concentric folds (with their attendant decollement)Low-angle thrust faults (commonly folded)Tear faults (usually transverse)Late normal faults (commonly listric) The assemblage in a particular area is also a function of the degree of deformation and of the lithology of the deformed rocks. Intensity of deformation increases from east to west. Regional stratigraphic changes alter the major lithologic units, while local isopach or facies changes alter the distribution of incompetent rocks within units. The structural styles are all "thin-skinned," as the underlying Hudsonian basement is not involved. This review article summarizes current knowledge of the geometry of "foothills" structures, their mode of occurrence, and some of the empirical rules for their interpretation. Application of this knowledge is illustrated by attempts to provide geometric solutions for the structural conundrums posed by the Brazeau Range, the Flathead Fault and the Rocky Mountain Trench.

ISSN: 0007-4802
Serial Title: Bulletin of Canadian Petroleum Geology
Serial Volume: 18
Serial Issue: 3
Title: Structural geology in the eastern margin of the canadian rocky mountains
Pages: 332-406
Published: 1970
Text Language: English
Publisher: Canadian Society of Petroleum Geologists, Calgary, AB, Canada
Accession Number: 1970-037910
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
N42°00'00" - N84°00'00", W141°00'00" - W52°00'00"
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1970
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