Earth's iron deposits could have been created by anaerobic light-harvesting microbes instead of those that make oxygen!
Microbe of the episode
Microbe of the episode: Streptomyces avidinii
But was it photosynthesis and the oxygen it created that transformed most of the planet's iron into its insoluble form, creating large iron deposits in the ground? This study explores the possibility that it was another form of light-harvesting metabolism, called photoferrotrophy, that uses light and the transformation of iron to generate energy. This hypothesis is found to be consistent with the evidence we have about what the early earth was like.
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