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Book Chapter

Plate tectonic evolution of the Cascades arc-subduction complex

By
Robert A. Duncan
Robert A. Duncan
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LaVerne D. Kulm
LaVerne D. Kulm
College of Oceanography, Oregon State University, Corvallis, Oregon 97331
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Published:
January 01, 1989

Abstract

The geological development of the Pacific Northwest margin of North America from earliest Tertiary time to the present has been dominated by the effects of plate convergence. During this period the North America Plate has moved slowly but increasingly westward as the Atlantic basin widened, and has collided with eastward-moving oceanic plates formed in the Pacific basin. Much of the geologic record of this collision has been removed by subduction of the oceanic plate beneath North America, with the exception of limited quantities of accreted and deformed oceanic rocks, and has been covered by younger volcanic and sedimentary material on the continent. Thus, a description of the plate tectonic evolution of this active continental margin is speculative and based on assumptions and inferences from the fragmentary geological evidence. This is certainly a problem common to all convergent margins, but many factors in the convergence history of this plate boundary make it unusual and offer the promise of isolating a few of the variables in subduction-related processes.

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Contents

DNAG, Geology of North America

The Eastern Pacific Ocean and Hawaii

E. L. Winterer
E. L. Winterer
Scripps Institution of Oceanography La Jolla, California 92093
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Donald M. Hussong
Donald M. Hussong
University of Hawaii Department of Geology and Geophysics Honolulu, Hawaii 96822
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Robert W. Decker
Robert W. Decker
4087 Silver Bar Road Mariposa, California 95338
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Geological Society of America
Volume
N
ISBN electronic:
9780813754659
Publication date:
January 01, 1989

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