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Book Chapter

Modern active oceanic margins of North America

By
Roland von Huene
Roland von Huene
U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025
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Robin Riddihough
Robin Riddihough
Geological Survey of Canada, 601 Booth St., Ottawa, Ontario K1A 0E8, Canada
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Published:
January 01, 1994

Abstract

Modern convergent and strike-slip margins are crossed by six continent/ocean transects (Fig. 1). Along these margins, continental and oceanic crust are separated by a seismically active tectonic contact, which is the boundary between the North American Plate and the Pacific or Cocos Plates. Four transects cross convergent margins where oceanic crust underthrusts continental crust (A-2, B-2, B-3, and H-2). One transect (B-l) is across the Queen Charlotte Transform Fault, a part of the Pacific-North American plate boundary, which is as long as the better-known San Andreas Fault. Another transect (A-3) crosses a collision zone and the controversial transition fault zone, which is interpreted by some as a highly oblique thrust and by others as inactive during the past 5 m.y. or more, and only recently an active fault.

We summarize here the tectonic interpretations of these boundaries made by the transect teams, and results from work completed after the transects were assembled. After transect compilation, the multichannel seismic records across active margins in A-2 and H-2 were reprocessed, and a new record was acquired in the B-2 transect area.

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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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