Coupling sulfur and oxygen isotope ratios in sediment melts across the Archean-Proterozoic transition

The Archean-Proterozoic transition marks a time of fundamental geologic, biologic, and atmospheric changes to the Earth system, including oxygenation atmosphere (termed Great Oxygenation Event; GOE), emergence continents above sea level. impacts GOE on Earth’s surface environment are imprinted geologic record, disappearance mass-independent fractionation sulfur isotopes (S-MIF). Temporally overlapping geochemical observations (e.g. change in oxygen isotope ratio sediments an increase subaerial volcanism) imply widespread was coeval with oxygenation. Here we present triple ratios pyrite garnet zircon global suite Archean Proterozoic granitoids derived from partial melting sedimentary protoliths. These crustal melts record average ?18O 7.2‰ before 2.3 Ga 10.0‰ post-2.3 Ga. Pre-2.3 show small S-MIF signatures ?33S ranging ?0.29‰ 0.13‰, whereas S-MDF (i.e. = 0‰). combination same sample U-Pb geochronology provides new insights potential causal link between Paleoproterozoic