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ABSTRACT: Canga is a moderately hard iron-rich duricrust primarily composed of goethite as a result of the weathering of banded iron formations.Canga duricrusts lack a well-developed soil profile and consequently form an innate association with rupestrian plants that may become ferruginised, contributing to canga possessing macroscopic biological features.Gold is generally resistant to oxidation but a remarkable biogeochemical cycle can produce secondary gold.Finally, banded iron formations, which are microbially catalysed sedimentary deposits, can be further weathered to form high-grade ore.

ABSTRACT: Uranium soil depollution is of great concern as, like any other radionuclide, it may accumulate in time and generate a negative impact on human health.

Replication of these iron-oxidising bacteria appeared to infill the porous regions within canga.

Synchrotron-based Fourier transform infrared (FTIR) microspectroscopy demonstrated that organic biomarkers were poorly preserved with only weak bands indicative of aliphatic methylene (CH2) associated with permineralised microbial biofilms.

In contrast, the cell envelopes immobilised by authigenic iron oxides were primarily of rod-shaped microorganisms, were not permineralised and occurred in pore spaces within canga.

Complete mineralisation of intact rod-shaped casts and the absence of permineralisation suggested mineralised cell envelopes may represent fossilised iron-oxidising bacteria in the canga ecosystem.

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