A Hf-Nd isotopic correlation in ferromanganese nodules

Details A Hf-Nd isotopic correlation in ferromanganese nodules A Hf-Nd isotopic correlation in ferromanganese nodules

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.3895a&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 20, p. 3895-3898

Mathematics

Logic

27

Geochemistry: Isotopic Composition/Chemistry, Oceanography: Biological And Chemical: Chemical Tracers, Oceanography: Biological And Chemical: Geochemistry

Scientific paper

The 176Hf/177Hf ratio was measured on 34 ferromanganese nodules, mostly from the Atlantic ocean. The different ocean basins are isotopically distinct with the extreme compositions being less radiogenic in the Atlantic (ɛHf~+1) than in the Pacific (ɛHf~+9). A good correlation of ɛHf and ɛNd is observed amongst most samples which supports that Hf isotopic compositions in nodules reflect those of ambient seawater. For a given ɛNd, ɛHf is more radiogenic in ferromanganese nodules than in rocks from either the mantle or the crust. This correlation makes the coupled Hf-Nd systems a potential paleoceanographic tool. It is argued that a zircon-free clayish component of probable eolian origin may account for the radiogenic Hf in nodules.

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