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Continent-ocean transitions in western North America between latitudes 46 and 56 degrees: Transects B1, B2, B3

By
J.W.H. Monger
J.W.H. Monger
Geological Survey of Canada, 100 West Pender St, Vancouver, British Columbia V6B 1R8, Canada
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R. M. Clowes
R. M. Clowes
Department of Geological Sciences, University of British Columbia, Vancouver, British Columbia V6T 2B4, Canada
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D. S. Cowan
D. S. Cowan
Department of Geological Sciences, University of Washington, Seattle, Washington 98195
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C. J. Potter
C. J. Potter
Department of Geological Sciences, Cornell University, Ithaca, New York 14853
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R. A. Price
R. A. Price
Geological Survey of Canada, 601 Booth St., Ottawa, Ontario K1A 0E8, Canada
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C. J. Yorath
C. J. Yorath
Pacific Geoscience Centre, Sidney, British Columbia, Canada
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Published:
January 01, 1994

Abstract

This chapter is intended to supplement rather than reproduce material presented in Transects B-1, B-2, and B-3 and their accompanying texts, although some overlap is unavoidable, particularly in summary descriptions of major lithological and structural packages that form the crust of this segment of the Cordillera. The chapter discusses results of recent studies by COCORP within the east-central part of the corridor of transect B-3A, and by LITHOPROBE within the corridors of B-2 and B-3A on and west of Vancouver Island and between B-2 and B-3 A in the east-central Cordillera (Fig. 1). The new results confirm the general principles on which the transects were constructed but constrain depths and attitudes of major lithological packages and structures and provide insights into processes within deeper parts of the crust.

Transects B-1, B-2, and B-3 lie in the segment of the Cordillera that includes the southern half of British Columbia and Alberta in Canada, and Washington, northern Idaho, and Montana in the United States (Fig. 1). Each transect emphasizes a somewhat different aspect of Cordilleran geology. Transect B-1 (Yorath and others, 1985c) extends through a region between latitudes 51°N and 56°N and longitudes 126°W to 133°W. It exploits relatively abundant data in the offshore region to illustrate complex interactions near the plate junction between the Explorer (northern subplate of the Juan de Fuca Plate), Pacific, and North American plates and extends eastward across the granitic and high-grade metamorphic terrane of the Coast Mountains to terminate in the volcanogenic and sedimentary terranes of

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Contents

DNAG, Continent-Ocean Transect Series

Phanerozoic Evolution of North American Continent-Ocean Transitions

Robert C. Speed
Robert C. Speed
Department of Geological Sciences Northwestern University Evanston, Illinois 60208
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Geological Society of America
Volume
Summary volume
ISBN electronic:
9780813754437
Publication date:
January 01, 1994

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