Mining ancient ores for clues to early life

This item was filled under Climate
An analysis of sulfide ore deposits from one of the world's richest base-metal mines confirms oxygen levels were extremely low on Earth 2.7 billion years ago, but also shows that microbes were actively feeding on sulfate in the ocean and influencing seawater chemistry during that geological period. The research provides new insight into how ancient metal-ore deposits can be used to better understand the chemistry of the ancient oceans -- and the early evolution of life....
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