Mineralization products of iron-reducing bacteria and their implications to Iron Formations deposition
Iron-reducing bacteria,as one of the models of microbial mineralization,are widely involved in the biogeochemical cycle of iron.They can induce mineralization extracellularly of a variety of Fe(Ⅱ)-containing minerals,e.g.,magnetite,siderite,vivianite,and green rust with organic matter or hydrogen as an electron donor.This paper mainly introduces the mineral characteristics,formation conditions and influence factors of mineralization products of iron-reducing bacteria.Additionally,this study has synthesized abiogenic and biogenic magnetite by dissolved Fe2+and iron-reducing bacteria Shewanella oneidensis MR-4 with trace element-coprecipitated ferrihydrite as substrate under a strict anaerobic condition in the laboratory.The results have shown that the presence of trace elements changed the morphology and particle size of magnetite.Combing with these previous studies on microorganism processes that might be involved in Iron Formations deposition,we evaluate the validity of trace elements as an indicator of mineral origin,and explore the potential processes of iron-reducing bacteria participating in Iron Formations deposition.
Iron-reducing bacteriaIron FormationsMagnetiteSideriteTrace elements
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