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Microbial mediated formation of Fe-carbonate minerals under extreme acidic conditions.

  • Sánchez-Román M Centro de Astrobiología (INTA-CSIC), Torrejón de Ardoz, 28850 Madrid, Spain.
  • Fernández-Remolar D Centro de Astrobiología (INTA-CSIC), Torrejón de Ardoz, 28850 Madrid, Spain.
  • Amils R 1] Centro de Astrobiología (INTA-CSIC), Torrejón de Ardoz, 28850 Madrid, Spain [2] Centro de Biología Molecular Severo Ochoa, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
  • Sánchez-Navas A Departamento de Mineralogía y Petrología, Facultad de Ciencias, Universidad de Granada, 18002 Granada, Spain.
  • Schmid T Department of Chemistry and Applied Biosciences, ETH-Zurich, CH 8093 Zurich, Switzerland.
  • San Martin-Uriz P Centro de Astrobiología (INTA-CSIC), Torrejón de Ardoz, 28850 Madrid, Spain.
  • Rodríguez N Centro de Astrobiología (INTA-CSIC), Torrejón de Ardoz, 28850 Madrid, Spain.
  • McKenzie JA Geological Institute, ETH-Zurich, CH 8092 Zurich, Switzerland.
  • Vasconcelos C Geological Institute, ETH-Zurich, CH 8092 Zurich, Switzerland.
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  • 2014-04-24
Published in:
  • Scientific reports. - 2014
Carbonates
Geologic Sediments
Hydrogen-Ion Concentration
Iron
Minerals
English Discovery of Fe-carbonate precipitation in Rio Tinto, a shallow river with very acidic waters, situated in Huelva, South-western Spain, adds a new dimension to our understanding of carbonate formation. Sediment samples from this low-pH system indicate that carbonates are formed in physico-chemical conditions ranging from acid to neutral pH. Evidence for microbial mediation is observed in secondary electron images (Fig. 1), which reveal rod-shaped bacteria embedded in the surface of siderite nanocrystals. The formation of carbonates in Rio Tinto is related to the microbial reduction of ferric iron coupled to the oxidation of organic compounds. Herein, we demonstrate for the first time, that Acidiphilium sp. PM, an iron-reducing bacterium isolated from Rio Tinto, mediates the precipitation of siderite (FeCO3) under acidic conditions and at a low temperature (30°C). We describe nucleation of siderite on nanoglobules in intimate association with the bacteria cell surface. This study has major implications for understanding carbonate formation on the ancient Earth or extraterrestrial planets.
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  • English
Open access status
gold
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Persistent URL
https://folia.unifr.ch/global/documents/40739
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