An improved femtosecond laser-ablation fluorination method for measurements of sulfur isotopic anomalies (∆ S and ∆ S) in sulfides with high precision.

Rationale: Measurements of the multiple sulfur isotopic composition (δ S, δ S and δ S values) of ancient sedimentary sulfide are useful for clarifying and reconstructing the picture of the global sulfur cycle on the early Earth. The methods used for these measurements should provide a high level of precision for the determination of sulfur isotope mass-independent anomalies (∆ S and ∆ S values). Here we propose some improvements to the earlier published femtosecond laser-ablation fluorination method to make it suitable for measuring both ∆ S and ∆ S values in the Archean sedimentary sulfides with acceptable precision.