P-T Alpine metamorphic evolution of the Monte Rosa nappe along the Piedmont Zone boundary (Gressoney Valley, NW Italy)

► The Monte Rosa nappe shows a polymetamorphic and polycyclic evolution. ► Metamorphic evolution is related to multiple burial-exhumation cycles. ► Pseudosection modelling of metabasite and metapelite in southern Monte Rosa nappe. ► PT path shows a post-eclogitic decompression trajectory followed by a PT increase. ► HP conditions reached 570 °C and 27 kbar, while late re-equilibration developed from 550 to 600 °C and 7 to 9 kbar.