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Nd isotopic variations in Precambrian banded iron formationsThe 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.
Document ID
19880044568
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Jacobsen, Stein B.
(Harvard Univ. Cambridge, MA, United States)
Pimentel-Klose, Mario R.
(Harvard University Cambridge, MA, United States)
Date Acquired
August 13, 2013
Publication Date
April 1, 1988
Publication Information
Publication: Geophysical Research Letters
Volume: 15
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
88A31795
Funding Number(s)
CONTRACT_GRANT: NAG9-90
CONTRACT_GRANT: NSF EAR-84-51172
CONTRACT_GRANT: NSF EAR-82-06954
Distribution Limits
Public
Copyright
Other

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