Discussion
Porphyry copper deposits are associated with :
Answer: B
Porphyry copper deposits are associated with subduction zones.
They form above subducting plates, where hydrous calc-alkaline magmas of intermediate to felsic composition rise into the crust of a continental or island arc. Hydrothermal fluids released from these porphyritic intrusions deposit copper (with molybdenum and gold) in disseminated grains and stockworks. The Andes of Chile and Peru, the classic porphyry copper belt, lie above the subducting Nazca plate.
Mid-ocean ridges and back-arc basins are typical settings for volcanogenic massive sulphides, and continental rifts host deposits such as sediment-hosted copper, not porphyry systems.
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