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In WP3, we aim to discuss the extent and length-scale of chemical and isotopic changes caused in host mantle peridotite by interaction with pyroxenite-derived melts, and to unravel the process driving the interaction. We will focus on peridotite-pyroxenite profiles from two settings, the External Liguride ophiolites and the Smoothseafloor mantle from SWIR... Further insights on the contribution of pyroxenites to MORBs will be derived by the study of oceanic mantle-crust temporal series. We aim to develop a new method to reveal the presence of pyroxenites in the source based on their thermal effect on the melting process. This approach can be applied only on temporal series where the effects of source and temperature variability can be constrained. We will focus on two sampling series: i) the Vema lithosperic section (MAR), covering 0-26 My seafloor extension, ii) the Smoothseafloor region, covering 0-6 My... This project "Melt-rock rection and melt migration in the MORB mantle..