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GEOREF RECORD

Brecciation in the Devonian Keg River Formation of northern Wood Buffalo National Park, Northeast Alberta

D. G. Park and Brian Jones
Brecciation in the Devonian Keg River Formation of northern Wood Buffalo National Park, Northeast Alberta
Bulletin of Canadian Petroleum Geology (December 1987) 35 (4): 416-429

Abstract

The Keg River Formation exposed along Salt River in Wood Buffalo National Park was deposited on the northeastern margin of the La Crete subbasin. The exposed sequence embraces units A, B and C. Antiform structures and associated brecciation in these strata can be related to the formation of submarine pseudo-anticlines, tepee structures and localized collapse associated with the removal of evaporites of the underlying Chinchaga Formation. The submarine pseudo-anticlines in unit A are up to 15 cm high and 0.5 m wide whereas the tepee structures of units A and B are up to 3.6 m high and 5.4 m wide. The tepees are separated by well-defined, saucer-shaped areas filled by subunit C1. Subunit C2 is undisturbed and overlies unit C1 as well as the crests of the tepees. The breccia associated with the tepee structures is largely confined to their core areas. It is formed of material derived from units A and B with minor amounts of foreign material. The tepees were formed after dolomitization of units A and B, since fractures in the dolomitized clasts are filled with limestone that is akin to the limestone in unit C. Units A and B underwent three phases: dolomitization, skeletal leaching and dedolomitization. Unit C was affected only by minor dolomitization of the burrow fill. The boundary between unit B and unit C marks a depositional hiatus, due probably to exposure in a coastal setting, during which time the tepee structures developed and units A and B underwent extensive diagenesis. The breccia bodies that cut units A, B and C formed at a later stage and include clasts of material derived from these units as well as younger, foreign material. Such foreign clasts probably originated from higher parts of the Keg River Formation which have since been removed from the area by erosion. These breccia bodies are evaporite-solution collapse breccia, probably related to dissolution of underlying evaporites of the Chinchaga Formation.


ISSN: 0007-4802
Coden: BCPGAI
Serial Title: Bulletin of Canadian Petroleum Geology
Serial Volume: 35
Serial Issue: 4
Title: Brecciation in the Devonian Keg River Formation of northern Wood Buffalo National Park, Northeast Alberta
Affiliation: 300 5th Ave. S.W., Calgary, AB, Canada
Pages: 416-429
Published: 198712
Text Language: English
Summary Language: French
Publisher: Canadian Society of Petroleum Geologists, Calgary, AB, Canada
References: 42
Accession Number: 1988-018533
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., sketch map
N59°40'00" - N59°49'60", W111°58'60" - W111°55'60"
Secondary Affiliation: Univ. Alberta, CAN, Canada
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute.
Update Code: 1988
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