title: Comment on "Iron isotope constraints on the Archean and Paleoproterozoic ocean redox state".
abstract: 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.
authors.affiliation: Institute for Research on Earth Evolution (IFREE), Japan, Agency for Marine-Earth Science and Technology (JAMSTEC),2-15 Natsushima, Yokosuka 237-0061, Japan. kosei@jamstec.go.jp
authors.forename: Kosei E
authors.initials: KE
authors.lastname: Yamaguchi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ohmoto
mesh_terms: D019015:Geologic Sediments / Q000737:chemistry*; D007501:Iron / Q000737:chemistry; D007503:Iron Isotopes / Q000032:analysis*; D009792:Oceans and Seas; D012623:Seawater; D013440:Sulfides / Q000737:chemistry; D013995:Time
chemical_list: D007503:Iron Isotopes; D013440:Sulfides; C011342:pyrite; D007501:Iron