Clues from Fe isotope variations on the origin of early Archean BIFs from Greenland

Nicolas Dauphas, Mark Van Zuilen, Meenakshi Wadhwa, Andrew M. Davis, Bernard Marty, Philip E. Janney

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Abstract

Archean rocks may provide a record of early Earth environments. However, such rocks have often been metamorphosed by high pressure and temperature, which can overprint the signatures of their original formation. Here, we show that the early Archean banded rocks from Isua, Akilia, and Innersuartuut, Greenland, are enriched in heavy iron isotopes by 0.1 to 0.5 per mil per atomic mass unit relative to igneous rocks worldwide. The observed enrichments are compatible with the transport, oxidation, and subsequent precipitation of ferrous iron emanating from hydrothermal vents and thus suggest that the original rocks were banded iron formations (BIFs). These variations therefore support a sedimentary origin for the Akilia banded rocks, which represent one of the oldest known occurrences of water-laid deposits on Earth.

Original languageEnglish (US)
Pages (from-to)2077-2080
Number of pages4
JournalScience
Volume306
Issue number5704
DOIs
StatePublished - Dec 17 2004
Externally publishedYes

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    Dauphas, N., Van Zuilen, M., Wadhwa, M., Davis, A. M., Marty, B., & Janney, P. E. (2004). Clues from Fe isotope variations on the origin of early Archean BIFs from Greenland. Science, 306(5704), 2077-2080. https://doi.org/10.1126/science.1104639