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Book Chapter

Piercement Structures in Canadian Arctic Islands1

By
Don B. Gould
Don B. Gould
Denver, Colorado 80222, and Calgary, Alberta
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George de Mille
George de Mille
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Published:
January 01, 1968

Abstract

The Sverdrup basin in the Queen Elizabeth Islands of northern Canada contains many piercement structures with exposed cores of gypsum and anhydrite. Several cores are more than 10 sq mi in area. Adjacent anticlines may have unexposed evaporite cores. The basin is about 700 mi long and 250 mi wide. It is filled with more than 40,000 ft of Mesozoic clastic strata underlain by possibly 5,000 ft of Pennsylvanian and Permian strata, including reefoid carbonate rock and an evaporite sequence. Salt is not known to be associated with these evaporites, but its presence is suggested by gravity data.

Piercement structures in the western part of the basin are large, domal features which show little or no evidence of tangential compression; they are probably salt domes which resulted from halokinesis or geostatic loading. Ordovician salt is known to be present in the Cornwallis fold belt, which presumably extends under the basin; it may have been involved in the early history of piercement structures in the central part of the basin.

In the eastern part of the basin some piercement structures are large and domal, but most are relatively small and elongate and are associated with major faults. These appear to have resulted from diapirism initiated by tangential forces during the Laramide orogeny.

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Contents

AAPG Memoir

Diapirism and Diapirs: a symposium

Jules Braunstein
Jules Braunstein
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Gerald D. O’Brien
Gerald D. O’Brien
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American Association of Petroleum Geologists
Volume
8
ISBN electronic:
9781629812304
Publication date:
January 01, 1968

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