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Biomineralization associated with microbial reduction of Fe3+ and oxidation of Fe2+ in solid minerals

January 1, 2009

Iron-reducing and oxidizing microorganisms gain energy through reduction or oxidation of iron, and by doing so play an important role in the geochemical cycling of iron. This study was undertaken to investigate mineral transformations associated with microbial reduction of Fe3+ and oxidation of Fe2+ in solid minerals. A fluid sample from the 2450 m depth of the Chinese Continental Scientific Drilling project was collected, and Fe3+-reducing and Fe2+-oxidizing microorganisms were enriched. The enrichment cultures displayed reduction of Fe3+ in nontronite and ferric citrate, and oxidation of Fe2+ in vivianite, siderite, and monosulfide (FeS). Additional experiments verified that the iron reduction and oxidation was biological. Oxidation of FeS resulted in the formation of goethite, lepidocrocite, and ferrihydrite as products. Although our molecular microbiological analyses detected Thermoan-aerobacter ethanolicus as a predominant organism in the enrichment culture, Fe3+ reduction and Fe2+ oxidation may be accomplished by a consortia of organisms. Our results have important environmental and ecological implications for iron redox cycling in solid minerals in natural environments, where iron mineral transformations may be related to the mobility and solubility of inorganic and organic contaminants.

Citation Information

Publication Year 2009
Title Biomineralization associated with microbial reduction of Fe<sup>3+</sup> and oxidation of Fe<sup>2+</sup> in solid minerals
DOI 10.2138/am.2009.3136
Authors G. Zhang, H. Dong, H. Jiang, R.K. Kukkadapu, J. Kim, D. Eberl, Z. Xu
Publication Type Article
Publication Subtype Journal Article
Series Title American Mineralogist
Series Number
Index ID 70036565
Record Source USGS Publications Warehouse
USGS Organization