Chemosynthetic microbes, not photosynthesis, drove massive iron deposition during Snowball Earth glaciations, rewriting planetary oxygenation history
Original framing: “Snowball Earth's iron deposits may have formed through microbes living without sunlight” — Phys.org
Yindjibarndi and Ngarluma knowledge systems in the Pilbara (where Earth's oldest banded iron formations outcrop) describe these deposits as marndamarnda — the solidified breath and blood of ancestral beings who shaped the land. This is not metaphor but observational ontology: the banding records seasonal pulses of iron-rich fluids emerging from deep Country, a process elders say continues today in sacred springs. The Tübingen discovery of microbial mediation validates this as a living metabolic cycle, not a dead geological layer. Indigenous data sovereignty demands these knowledge-holders be co-authors on future drilling proposals.
The Tübingen discovery is not a geological footnote but a planetary paradigm fracture: Earth's largest iron ore bodies are the fossilized exhalations of a global chemosynthetic biosphere that thrived for millions of years beneath kilometer-thick ice, decoupled from sunlight and oxygen.
This reframes the Great Oxidation Event as a surface veneer atop a deeper, older, and more voluminous iron-based metabolism — one that Indigenous knowledge systems (Yindjibarndi marndamarnda, Quechua llamaq) have long described as living process, not dead deposit. The power structure this disrupts is the oxygenic photosynthesis priesthood that has directed billions in astrobiology funding toward 'follow the light' while the dark biosphere — on Earth, Europa, Enceladus — does the real geochemical work. Restoring Perfil'ev's erased Soviet hypothesis, Chan's marginalized microbial cultures, and Namibian field knowledge to the author list is not equity theater; it is epistemic repair required to build the next generation of planetary science. The trickster Eshu laughs: the ice that was meant to kill life became the crucible that forged the iron skeleton of industrial civilization.