Nd isotopic variations in Precambrian banded iron formations

Details Nd isotopic variations in Precambrian banded iron formations Nd isotopic variations in Precambrian banded iron formations

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..393j&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, April 1988, p. 393-396.

Physics

5

Iron Ores, Neodymium Isotopes, Precambrian Period, Rivers, Sea Water, Basalt, Bolivia, Brazil, Marine Chemistry

Scientific paper

The isotopic composition of Nd is reported for eight banded iron formations (BIFs) ranging in age from 0.65 to 3.4 Ga. The data suggest a trend of increasingly positive epsilon(Nd) values with age which is interpreted to reflect isotopic variations in Precambrian seawater. The Urucum (0.65 Ga) and the Gunflint (1.9 Ga) BIFs yield negative epsilon(Nd) values between -6 and 0. The remaining BIFs, with ages of 1.84 to 3.4 Ga, have predominantly positive values between -1 and +4. The Nd isotopic signature of BIFs changes from a principally continental source to a dominantly depleted mantle source from the present into the Archean.

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