Hafnium isotope stratigraphy of ferromanganese crusts

被引：57
作者：
Lee, DC
Halliday, AN
Hein, JR
Burton, KW
Christensen, JN
Günther, D
机构：
[1] Univ Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USA
[2] ETH Zentrum, Dept Erdwissensch, Inst Isotopengeol & Mineral Rohstoffe, CH-8092 Zurich, Switzerland
[3] US Geol Survey, Menlo Park, CA 94025 USA
[4] Univ Blaise Pascal, Dept Sci Terre, F-63038 Clermont Ferrand, France
[5] ETH Zurich, Inst Analyt Chem & Spurenanalyt, Anorgan Chem Lab, CH-8092 Zurich, Switzerland
来源：
SCIENCE | 1999年 / 285卷 / 5430期
关键词：
D O I：
10.1126/science.285.5430.1052
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
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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收藏
页码：1052 / 1054
页数：3
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