Hafnium isotope stratigraphy of ferromanganese crusts

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A Cenozoic record of hafnium isotopic compositions of central Pacific deep water has been obtained from two ferromanganese crusts. The crusts are separated by more than 3000 kilometers but display similar secular variations. Significant fluctuations in hafnium isotopic composition occurred in the Eocene and Oligocene, possibly related to direct advection from the Indian and Atlantic oceans. Hafnium isotopic compositions have remained approximately uniform for the past 20 million years, probably reflecting increased isolation of the central Pacific. The mechanisms responsible for the increase in 87Sr/86Sr in seawater through the Cenozoic apparently had no effect on central Pacific deep-water hafnium.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Hafnium isotope stratigraphy of ferromanganese crusts
Series title Science
DOI 10.1126/science.285.5430.1052
Volume 285
Issue 5430
Year Published 1999
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Science
First page 1052
Last page 1054
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