Isotopic constraints on the origin and nature of sulfur components within the ancient sub-continental lithospheric mantle

Estimating the sulfur isotope composition of Earth’s fertile mantle can provide insight into Earth’s constitution and the processes associated with establishing its highly siderophile element abundances. There is currently a disagreement in sulfur isotopic compositions between Ocean Island Basalts (OIB) (δ 34 S = 0) and Mid-Ocean Ridge Basalts (MORB) (δ 34 S ≈ −1) implying that their mantle sources are different. MORBs and OIBs are young, so it remains unknown whether sulfur isotopic composition