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Biomineralization associated with microbial reduction of Fe3+ and oxidation of Fe2+ in solid minerals
-
Gengxin Zhang
,
Hailiang Dong
Published/Copyright:
April 1, 2015
Abstract
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.
Received: 2008-11-5
Accepted: 2009-2-16
Published Online: 2015-4-1
Published in Print: 2009-7-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
CCSD;
iron redox cycling;
nontronite;
subsurface;
Thermoanaerobacter ethanolicus
Articles in the same Issue
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- Effects of hydration on thermal expansion of forsterite, wadsleyite, and ringwoodite at ambient pressure
- Forsterite, hydrous and anhydrous wadsleyite and ringwoodite (Mg2SiO4): 29Si NMR results for chemical shift anisotropy, spin-lattice relaxation, and mechanism of hydration
- Structural transitions and electron transfer in coffinite, USiO4, at high pressure
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- Primitive oxygen-isotope ratio recorded in magmatic zircon from the Mid-Atlantic Ridge
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- X-ray diffraction and Raman spectroscopic study of clinopyroxenes with six-coordinated Si in the Na(Mg0.5Si0.5)Si2O6-NaAlSi2O6 system
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