Primary hematite formation in an oxygenated deep sea 3.46 billion years ago Hoashi, M. ; Bevacqua, D. C. ; Otake, T. ; Watanabe, Y. ; Hickman, A. H. ; Utsunomiya, S. ; Ohmoto, H. Abstract Publication: Geochimica et Cosmochimica Acta Supplement Pub Date: June 2009 Bibcode: 2009GeCAS..73Q.536H