Barite precipitation was associated with low temperature hydrothermal venting in the 3.2 Ga Mapepe Formation, Barberton Greenstone Belt

Paul Mason, Desiree Roerdink & Dylan Wylmeth
Utrecht University, The Netherlands (1); University of Bergen, Norway (2); Institut de Physique du Globe de Paris, CNRS, France (3)

Sulfate minerals are rare in the geological record prior to 2.2 Ga. This is consistent with prevalent anoxic conditions in the Earth’s surface environment prior to the great oxidation event, and correspondingly low levels of sulfate in the Archean ocean. In contrast to this general scarcity, extensive barite (BaSO4) deposits are found in...
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