Comment on "Iron isotope constraints on the Archean and Paleoproterozoic ocean redox state".
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.
Yamaguchi
Kosei E
KE
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
Ohmoto
Hiroshi
H
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
D007503:Iron Isotopes; D013440:Sulfides; C011342:pyrite; D007501:Iron