EarthRef.org Reference Database (ERR) -- Lee et al. 1999

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Lee et al. 1999

Lee, D.C., Halliday, A.N., Hein, J.R., Burton, K.W., Christensen, J.N. and Gunther, D. (1999). Hafnium isotope stratigraphy of ferromanganese crusts. Science 285(5430): 1,052-1,054.

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 Sr-87/Sr-86 in seawater through the Cenozoic apparently had no effect on central Pacific deep-water hafnium.

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Keywords
central pacific seawater, deep-ocean water, fe-mn crusts, pb isotopes, hf, nd, deposits, nodules, mantle, evolution

Journal
Science
http://www.sciencemag.org/

Publisher
American Association for the Advancement of Science
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