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  • that microorganisms may participate in the precipitation of Fe and Mn.
  • with anaerobic waters. This has relevance for environmental monitoring and prediction of the onset of hypoxia in bottom waters. If the magnetic signal is preserved over time, the technique also may prove useful in geochemical prospecting and in paleooceanographic
  • Iron sulfide minerals may be formed in tidal marshes following microbial reduction of sulfate to sulfide. Sulfate reduction requires certain necessary factors including sulfate reducing bacteria, organic matter, low redox potential, and sulfate
  • Manganese oxides in soils may result from microbiological action rather than inorganic oxidation. The purpose of this study was to investigate the mineralogy of Mn oxides produced by fungal oxidation of Mn-containing siderite (FeCO3) rock
  • range from intracellular to million ton ore bodies. The research thrusts are on modern and on ancient environments because similar biogeochemical mechanisms may have been involved in the formation of the earliest laminated rocks, the banded iron
  • The genesis of supergene products in the sedimentary Mn deposits on Groote Eylandt is the subject of detailed investigations. Among the many geochemical and biological mechanisms which may have influenced the mobilization or precipitation of ores
  • in the precipitation of manganese. The microstructures suggest that microbial precipitation may have been a dominant factor in the precipitation of both iron and manganese in the Trommald Formation.