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Science 13 January 2006:
Vol. 311. no. 5758, p. 177
DOI: 10.1126/science.1118221
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Technical Comments

Comment on "Iron Isotope Constraints on the Archean and Paleoproterozoic Ocean Redox State"

Kosei E. Yamaguchi

Hiroshi Ohmoto

Rouxel et al. (Reports, 18 February 2005, p. 1088) argued that changes in the iron isotopic composition of sedimentary sulfides reflect changes in the oxidation state of the atmosphere-ocean system between 2.3 and 1.8 million years ago. We show that misinterpretations of the origins of these minerals undermine their conclusions.

Institute for Research on Earth Evolution (IFREE), Japan
Agency for Marine-Earth Science and Technology (JAMSTEC),
2-15 Natsushima, Yokosuka 237-0061, Japan.
NASA Astrobiology
Institute, USA.

NASA Astrobiology
Institute, USA.
Astrobiology Research Center and
Department of Geosciences, The Pennsylvania State University,
University Park, PA 16802, USA.

To whom correspondence should be addressed. E-mail: kosei{at}jamstec.go.jp

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Science. ISSN 0036-8075 (print), 1095-9203 (online)