Instrumental mass fractionation during sulfur isotope analysis by secondary ion mass spectrometry in natural and synthetic glasses

Supplemental Material: Slab-derived sulfate generates oxidized basaltic magmas in the southern Cascade arc (California, USA)

“…We do not see evidence for variable IMF related to glass composition (e.g. Taracsák et al, 2021), consistent with previous analyses at the same facility (Fiege et al, 2014). Compositional information and reference values for each standard are reported in Table S7.…”

High spatial resolution and precision NanoSIMS for sulfur isotope analysis

“…Many factors can affect the accuracy and precision of sulfur isotope measurements, including the surface topography of samples, a lack of matrix-matched standards or compositional heterogeneity, stability of the magnetic eld, and FC background noise. [11][12][13][14]31,48,49 Two main factors affect the accuracy of the sulfur isotope ratio when conducting high-resolution sulfur analysis with NanoSIMS: EM aging and height (Z) inuence.…”

Constraints on the sulfur subduction cycle in Central America from sulfur isotope compositions of volcanic gases

“…We note however that the isotope composition of erupted magma is poorly constrained because few δ 34 S data are available for scoria, which were not erupted at the same time as gas samples. Future work should aim to improve understanding of gas-melt fractionation by detailed analysis of scoria and melt inclusion S isotope compositions using updated S extraction methods (Labidi et al, 2012) and secondary ion mass spectrometry (Taracsák et al, 2021). Note however that our estimate of the S isotope composition of total arc output is not sensitive to changes in the estimated δ 34 S of erupted magma because the contribution of S output as erupted magma to the total output budget is minor (Table 2, Fig.…”