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A Nd isotopic study of the Hamersley and Michipicoten banded iron formations - The source of REE and Fe in Archean oceansA detailed Nd isotopic study of the large and well-dated Hamersley and Michipicoten banded iron formations (BIFs) has been conducted. The Hamersley BIFs (Lake Superior type) are located in the Pilbara craton of Western Australia and the Michipicoten BIFs (Algoma type) are located in the northeastern corner of Lake Superior in Ontario, Canada. Their initial epsilon(Nd) values are variable and in the range of 0 to +4. The Fe/Nd ratio in present-day hydrothermal waters and BIFs are both 100,000, suggesting that the source of much of the Fe in BIFs (and Archean seawater) was hydrothermal water circulating through Archean midocean ridge systems.
Document ID
19880038765
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
January 1, 1988
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 87
Issue: 1-2
ISSN: 0012-821X
Subject Category
Geophysics
Accession Number
88A25992
Funding Number(s)
CONTRACT_GRANT: NAG9-90
CONTRACT_GRANT: NSF EAR-82-07219
CONTRACT_GRANT: NSF EAR-84-51172
Distribution Limits
Public
Copyright
Other

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