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Book Chapter

The Central Oregon Continental Margin, Lines WO76-4 and WO76-55

By
Parke D. Snavely, Jr.
Parke D. Snavely, Jr.
U.S. Geological Survey Menlo Park, California
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Roland von Huene
Roland von Huene
U.S. Geological Survey Menlo Park, California
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Dennis M. Mann
Dennis M. Mann
U.S. Geological Survey Menlo Park, California
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John Miller
John Miller
U.S. Geological Survey Denver, Colorado
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Published:
January 01, 1986

Abstract

The geologic history of Cenozoic sedimentary and volcanic rocks of the Oregon continental margin is interpreted as having involved episodic periods of underthrusting, transcurrent faulting, and extension between the oceanic and North American plates. The seismic sections across this margin illustrate that both compressional and extensional forces have molded the tectonic framework (Snavely et al., 1980).

The Oregon Coast Range and inner shelf is floored by Paleocene to lower Eocene ridge basalt (see diagrammatic cross section), which is interpreted to represent eruptions in an elongate basin formed by rifting of the continental margin (Snavely, 1984). Oceanic islands and sea mounts were constructed on the basaltic ocean floor, and the volcanic flows and breccia that erupted from these centers intertongue with neritic to bathyal sedimentary rocks of early and middle Eocene age. Middle Eocene turbidite sandstone overlaps both the oceanic basalts and the pre-Tertiary rocks of the Klamath Mountains, suturing the Coast Range to North America about 50 Ma.

Oblique convergence between the oceanic and the North American plates occurred during most of post-middle Eocene time, but periods of more head-on convergence occurred in the middle late Eocene and late middle Miocene. Sedimentation, punctuated by episodes of volcanism, was virtually continuous in the forearc basin, the axis of which lay along the present inner continental shelf. More than 7000 m of sedimentary and volcanic rocks were deposited in this basin (Snavely et al., 1980), which is located east of seismic lines 4 and 5 (see diagrammatic cross section).

The principal structure

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Contents

AAPG Studies in Geology

Seismic Images of Modern Convergent Margin Tectonic Structure

Roland von Huene
Roland von Huene
U.S. Geological Survey Menlo Park, California
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Susan Vath
Susan Vath
U.S. Geological Survey Menlo Park, California
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Christine Sperber
Christine Sperber
U.S. Geological Survey Menlo Park, California
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Bridgett Fulop
Bridgett Fulop
U.S. Geological Survey Menlo Park, California
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Lee Bailey
Lee Bailey
U.S. Geological Survey Menlo Park, California
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Monique Martin
Monique Martin
U.S. Geological Survey Menlo Park, California
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American Association of Petroleum Geologists
Volume
26
ISBN electronic:
9781629811499
Publication date:
January 01, 1986

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