Hafnium Isotope Stratigraphy of Ferromanganese Crusts-Reference-Cited by-同舟云学术

Hafnium Isotope Stratigraphy of Ferromanganese Crusts

Published:1999-08-13 Issue:5430 Volume:285 Page:1052-1054
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Lee Der-Chuen¹,Halliday Alex N.²,Hein James R.³,Burton Kevin W.⁴,Christensen John N.¹,Günther Detlef⁵

Affiliation:

1. Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109, USA.

2. Institut für Isotopengeologie und Mineralische Rohstoffe, Department für Erdwissenschaften, ETH-Zentrum, NO C61, Sonneggstrasse 5, CH-8092 Zürich, Switzerland.

3. U.S. Geological Survey, MS 999, 345 Middlefield Road, Menlo Park, CA 94025, USA.

4. Department des Sciences de la Terre, Universite Blaise-Pascal, 63038 Clermont-Ferrand, France.

5. Institut für Analytische Chemie und Spurenanalytik, ETH Zürich, Laboratorium für Anorganische Chemie, Universitätsstrasse 6, CH-8092 Zürich, Switzerland.

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

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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