Large mass-independent sulphur isotope anomalies link stratospheric volcanism to the Late Ordovician mass extinction
Origin of the sulphur isotope mass-independent fractionation signal Almost all physical, chemical and biological processes fractionate S-isotopes by the relative mass differences of each isotope, producing Δ33S values that are near-zero27. Sulphur photochemistry is one of the few processes that produces mass-independent fractionation, yielding non-zero Δ33S values16,29,30. As such, S-isotopes have been successfully used in […] More