Barberton,
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, the team discovered hard evidence for hydrothermal vents. Earlier studies had focused mainly on oxygen isotopes from limited samples that happened to have been strongly affected by this hydrothermal activity, and researchers had not recognized that the results revealed local, not ambient,
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, ocean temperatures.?
That,
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, says de Wit, was like looking at data from Yellowstone hot springs and extending it to an entire ocean. By sampling a much broader area,
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, he and Furnes determined that the superheating effects of hydrothermal activity had been strictly local. “You really have to map carefully and do a lot of isotope follow-up work to test it all,” he says.?
The study has implications for how life may have evolved. While hot oceans would have been largely inhospitable,
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, de Wit says that hydrothermal fields in a cool ocean would have provided a nurturing environment for bacteria, just as scientists see today around deep ocean hydrothermal vents.
“I believe this study is quite significant,
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,” says Yale University geochemist Ruth Blake,
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, who has studied the Barberton, too. The researchers “present compelling new evidence that advances our understanding of one of the most highly-debated periods in Earth's history.”?

Editor's note: This story was updated March 1,
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, 2016, to correct a typo concerning when gypsum would have formed. ?

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