Chromitites from the Vavdos ophiolite (Chalkidiki, Greece): Petrogenesis and geotectonic settings; constrains from spinel, olivine composition, PGE mineralogy and geochemistry

•High-Cr podiform chromitites were produced from boninitic melts.•Boninitic melts transported via dunite pathways within a highly depleted mantle.•Consistent with PGE geochemistry, the reported PGM belong to the Os-Ir-Ru system.•Magmatic laurite’s extensive solid solution series is attributed to melt cooling.•Cr-ore and PGM genesis occurred below the Moho in the fore-arc.