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

Gengxin Zhang^1,*, Hailiang Dong^1,, Hongchen Jiang², Ravi K. Kukkadapu³, Jinwook Kim⁴, Dennis Eberl⁵ and Zhiqin Xu⁶

¹ Department of Geology, Miami University, Oxford, Ohio 45056, U.S.A.
² Geomicrobiology Laboratory, State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
³ Pacific Northwest National Laboratory, MSIN K8-96, Richland, Washington 99352, U.S.A.
⁴ Department of Earth System Sciences, Yonsei University, Seoul, Korea
⁵ U.S. Geological Survey, Boulder, Colorado 80303, U.S.A.
⁶ Chinese Academy of Geological Sciences, Institute of Geology, Beijing 10037, China

Correspondence: Email: dongh{at}muohio.edu

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 Thermoanaerobacter 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.

Key Words: CCSD • iron redox cycling • nontronite • subsurface • Thermoanaerobacter ethanolicus