Extensive deposition of banded iron formations was possible without photosynthesis

@article{Franois1986ExtensiveDO,
  title={Extensive deposition of banded iron formations was possible without photosynthesis},
  author={Louis M. François},
  journal={Nature},
  year={1986},
  volume={320},
  pages={352-354}
}
Precambrian banded iron formations (BIFs) consist of alternating layers of silica and iron minerals such as haematite, magnetite and siderite1,2, but there is controversy as to the origin of the iron. According to one point of view, iron was precipitated from sea water containing Fe(II) ions in solution3,4. Because the photodissociation of water vapour in the Precambrian atmosphere would have been too slow to generate enough of the most probable oxidizing agent, oxygen5, this process would have… CONTINUE READING