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Rifting his­tory and structural development of the continental margin north of Alaska

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Abstract

Seismic-reflection profiles in the Alaskan Beaufort Sea and onshore geology indicate that the continental margin north of Alaska is of Atlantic type. Rifting appears to have begun in earliest Jurassic time, about 190 to 185 m.y. ago, when crustal extension created a rift-valley system beneath the Beaufort shelf and part of the adjacent coastal plain. Subsequent crustal warming caused rift-margin uplift and erosion, created a breakup unconformity, and initiated breakup and seafloor spreading in the Canada Basin about 125 m.y. ago. Subsequent cooling caused rapid subsidence of the margin, which was followed by vigorous progradation of the present continental terrace of the Beaufort Sea beginning in Albian time.

Additional publication details

Publication type Book chapter
Publication Subtype Book Chapter
Title Rifting his­tory and structural development of the continental margin north of Alaska
Year Published 1982
Language English
Publisher American Association of Petroleum Geologists
Description 24 p.
Larger Work Type Book
Larger Work Subtype Monograph
Larger Work Title M 34: Studies in continental margin geology
First page 77
Last page 100