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Elevation of Midocean Ridges and the Basement Age of JOIDES Deep Sea Drilling Sites

By
John G. Sclater
John G. Sclater
Marine Physical Laboratory of the Scripps Institution of Oceanography, Unitvercity of California, San Diego: La Jolla, California 92037
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Robert Detrick
Robert Detrick
Marine Physical Laboratory of the Scripps Institution of Oceanography, Unitvercity of California, San Diego: La Jolla, California 92037
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Published:
January 01, 1976

Abstract

The East Pacific Rise in the North Pacific drops from a crestal elevation of 2,800m to a depth of 5600 m for 75m.y. old.crusf. All other active midocean ridges except the North Atlantic close to Iceland show the same increase in depth with age but, within a 400-m .spread, have generally shallower crestal elevations. Depths and basement ages from JOIDES Deep Sea Drilling Project site cores in the Pacific are in excellent agreement with the empirical depth versus age curve lor the North Pacific determined Irom magnetic and topographic profiles. Sites in the northwestern , Pacific are used to extend this empirical curve from a depth of 5,600 m at 75 m.y. B.P. to 5,900.m at 135 m.y. B.P. JOlDES data from the North Atlantic lall nose to jthis extended curve but consistently show 200- to 30d-m shallower crestal elevations in the oldest regions—evidence that certaini goographic areas show small ( ±300 m). but significant departures from the uniform depth versus age relation for the North Pacific. The cause of these departures is at present, unknown.

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Mid-Atlantic Ridge

Peter A. Rona
Peter A. Rona
National Oceanic and Atmospheric Administration Atlantic Oceanographic and Meteorological Laboratories 15 Rickenbacker Causeway Miami, Florida 33149
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Geological Society of America
Volume
5
ISBN electronic:
9780813759050
Publication date:
January 01, 1976

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