Distinguish three different sulfur sources using SO₄/Cl ratios, δ³⁴S_SO4 and δ¹⁸O_SO4.

Authigenic groundwater sulfide minerals record sulfur sources in palaeo-groundwater.

Saline lakes and surface waters dominated by sulfur delivery from marine aerosols.

Joints in basement rock are dominated by sulfur derived from basement weathering.

Temporal changes in tectonics, climate and human impacts altered sulfur fluxes.