Petrogenesis and Ni-Cu-PGE sulphide potential of the Bell Rock Range, Giles Complex, central Australia

摘要: The layered Bell Rock Range in the Giles Complex, west Musgrave Province, central Australia, is a~ 5500 m thick troctolitic intrusive body. It comprises at least 6 subunits with distinct rare earth chemistry, but no cyclicity was observed in the geochemical trends. Each of the different subunits was formed by multiple magma injections which caused the magmatic system to alternate between a S-saturated and undersaturated state. Abundant olivine controls Ni; Cu and PGE are depleted in many layers and their geochemical trends are controlled by sulphide segregation. Saturation with S was most likely achieved by assimilation of crustal rocks.