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Geologic History of Pacific Ocean

E. L. Winterer
Geologic History of Pacific Ocean
The American Association of Petroleum Geologists Bulletin (1972) 56 (3): 663


Extrapolations from Deep Sea Drilling Project data suggest that the Pacific plate may be about 200 m.y. old at its west edge, but Cretaceous volcanism has largely buried the older record. Post-Jurassic sedimentary facies patterns reflect the northwestward motion of the plate relative to the equatorial zone of high biological productivity, as well as progressively increasing sea-floor depths as newly formed crust moves away from the East Pacific Rise. The Early Cretaceous volcanism which inundated much of the older western part of the plate was succeeded during the rest of Cretaceous and Cenozoic time by the building and subsidence of long chains of seamounts as the plate moved northwestward, possibly over hot spots beneath the lithosphere. A dearth of calcareous sediments of earliest Tertiary age in the central Pacific and a prominent unconformity beneath widespread middle Eocene cherts suggest a time of erosion and dissolution by especially vigorous deep currents, perhaps associated with the creation of a high-latitude circum-Antarctic Ocean. The Pacific is about a third narrower now than during the Jurassic, owing to the opening of the Atlantic. Crustal consumption has been faster along the east side of the Pacific than on the west, resulting in a progressive eastward shift of the rise crest from its earlier more central position. Additional extra losses of old lithosphere are chargeable to Cenozoic spreading behind the western island arc systems.

ISSN: 0002-7464
Serial Title: The American Association of Petroleum Geologists Bulletin
Serial Volume: 56
Serial Issue: 3
Title: Geologic History of Pacific Ocean
Author(s): Winterer, E. L.
Pages: 663
Published: 1972
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
Summary: Y
Accession Number: 1972-015865
Categories: Oceanography
Document Type: Serial
Bibliographic Level: Analytic
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 1972
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