The geologist would look for sulfide mineral deposits in divergent plate boundaries (spreading-center systems).
Divergent plate boundaries come in three varieties: continental-continental, oceanic-continental, and oceanic-oceanic. On the seafloor around undersea volcanoes, along several mid-ocean ridges, and within back-arc basins and forearc rifts, huge sulfide deposits are currently generating due to volcanism. When hot hydrothermal fluids rich in dissolved metals and sulfur mix with cold seawater as they ascend to the seafloor from deep within the underlying crust, volcanogenic massive sulfide deposits are formed on the seafloor. As a result, this specific location, divergent plate boundaries, would be prefered by the geologist when they are looking for sulfide mineral deposits.
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