Hafnium isotope stratigraphy of ferromanganese crusts
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Abstract
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.
Suggested Citation
Lee, D., Halliday, A.N., Hein, J., Burton, K., Christensen, J., and Gunther, D., 1999, Hafnium isotope stratigraphy of ferromanganese crusts: Science, v. 285, no. 5430, p. 1052-1054, https://doi.org/10.1126/science.285.5430.1052.
| 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 |