Magmatic controls on the generation of porphyry fluids: Insight from melt inclusions in the ore generating Farallon Negro Volcanic Complex, Argentina

Laser-Ablation ICP-MS analyses of melt inclusions from an ore-forming volcanic system suggest, that melts and fluids responsible for porphyry-type mineralisation are extracted from the boundary layer of a crystallising magma chamber. During boundary-layer fractionation, Cu is partitioned into a sulphide melt, which is later de-stabilised by a fluid phase.