We welcome contributions dealing with: 1) Reconstructions of the structure and composition of the upper mantle, and the origin of its stratification, such as the influence of plumes and subduction zones during root construction; 2) The interactions of plume and subduction-derived melts and fluids with mantle roots after root construction, and the nature and development of metasomatic agents; 3) The origin and evolution of mantle melts originating below or in layered mantle lithosphere; 4) the role of mantle melts and fluids in the generation of hybrid and acid magmas.

These topics can be illuminated using mantle xenoliths, mantle-derived melts and experimental simulations, for example through: 1) Reconstruction of the structures and compositions of the mantle roots based on PT estimates and detailed geochemistry of mantle and lower crustal xenoliths from deep seated magmas such as alkali basalts and kimberlites; 2) Reconstruction of the conditions and substrate of primary and contaminated mantle magmas using whole rock geochemistry as well as trace-element and isotope geochemistry of xenocrysts and phenocrysts; 3) Reconstruction of asthenospheric structure based on petrological and geophysical data; 4) Links between high pressure-temperature experiments under mantle conditions and data obtained from the petrology of natural xenoliths and magmas; 5) Models of rising mantle melts, xenoliths and xenocrysts including diamonds based on theoretical and petrological data; 6) Thermodynamic and mathematic modeling of heterophase interaction at the top of mantle plumes; 7) Oxygen fugacity of mantle rocks: fluctuation and mechanisms; 8) Vertical motions of the melts and solids including ascent of mantle; and 9) Interaction of mantle magmas and fluids with the crust and generation of the hybrid and acid melts