Injection of additional batches of magma into the formed magma chamber: The case study of Lukkulaisvaara intrusion,North Karelia

The probable implications of the injection of additional batches of melt into the magma chamber and the correlation of ore formation to these processes are considered. The assumed model of hydraulic impact (stamp) explains a number of the structural features of layered basite-hyperbasite intrusions and, in particular, formation of microgranular rocks, whose structure indicates a high rate of crystallization, and, probably, platinum group element (PGE) mineralization in the Lukkulaisvaara layered intrusion, North Karelia. It is shown that intrusion of additional batches of magma can lead to thermodiffusion, which is most effective in the vicinity of the contact between the chamber and the portion of magma. This, in turn, should result in the redistribution of chemical components in this zone and, probably, to anomalous concentrations of productive components at early penetration stages.