Snowball Earth's iron deposits may have formed through microbes living without sunlight

PHYSorg
Oct 7, 2026, 8:00 pm601 ptsTrendingTop
Iron is one of the most abundant metals on Earth's surface, yet how such massive iron ore deposits formed throughout geological history has long remained a mystery. The prevailing theory has been that ancient photosynthetic bacteria oxidized iron, causing it to precipitate and accumulate in the oceans.

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