Sulfur and oxygen isotopes in sulfate: applications and limits
IPGP - Îlot Cuvier
Laboratoire Domaines Océaniques, Brest
Distinct fluctuations in sulfate sulfur and oxygen stable isotope compositions (delta34SSO4, Delta33SSO4, delta18OSO4, and Delta17OSO4) reflect some of the most extreme changes in Earth history. I will present two such cases of extreme changes: 2009-2013 modern riverine dissolved sulfate delta34SSO4 and Delta17OSO4 data from the largest river in North America that show heavy anthropogenic perturbation, and the ~635 Ma Marinoan “Snowball Earth” post-glacial sedimentary rock record of Earth’s most negative Delta17OSO4. In addition, I will explore how the modification of these dramatic isotope signals complicates their interpretation.