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Significance A geochemical model shows that discrete volcanic perturbations, coupled to long-term changes in sulfur biogeochemistry result in apparent stepwise changes in the isotopic composition of marine sulfur, similar to the patterns seen in the marine barite record of the Cenozoic and Late Mesozoic. The perturbations required to reproduce this isotope record in the model correlate with the timing and approximate size of large igneous provinces, particularly those intruding volatile-rich rock, suggesting that these events are responsible for much of the enigmatic structure in the sulfur isotope record of the last 120 My.

Volcanic controls on seawater sulfate over the past 120 million years