Figure 6. Structure of magmatic systems in the large Baltic SHMS Province as a function of tectonic conditions. (1) Ancient lithospheric mantle; (2) ancient lower crust; (3) ancient sialic crust; (4) paths of magma batches ascending through the crust by the mechanism of zone refinement; (5) transitional chambers (layered intrusions); (6) volcanosedimentary deposits in rift-related structures; (7) zone of tectonic flow into the Belomorian Mobile Belt.