... magma to overlyingvolcanism. Both the ore bodies and the plutons are composite structures built upa many individual pulses of magma and hydrothermal flu id. The ores are notconfined to the plutons ... metal contents: most deposits arerelated to oxidized, magnetite-series plutons, but some Sn and Mo deposits arerelated to reduced, ilmenite-series plutons.Distribution and age: Porphyry deposits ... banding is verysimilar to sedimentary bedding and this, together with other features of theores and their geological setting led Stanton, an influential Australian geolo-gist, to propose in the 1960s...