Seismic imaging portrayed Earth’s deep mantle as a complex landscape that is heterogeneous across scales. This heterogeneity manifests in distinct phenomena ranging from continent-sized provinces to kilometer-scale scatterers, including two large low-velocity provinces (LLVPs) beneath Africa and the Pacific, and ultra-low velocity zones (ULVZs) above core-mantle boundary. These structures are connected to mantle convection, plume generation, slab interactions, and Earth’s long-term thermochemical evolution.
However, the deep mantle remains poorly understood due to extreme pressure-temperature conditions, limited constraints on material properties, and indirect nature of geochemical observations. Seismic interpretations are complicated by overlying structures.

We invite contributions that integrate observations, experiments, and numerical models to connect deep and upper mantle processes and develop an unified understanding of whole-Earth dynamics. Topics include deep mantle structure and dynamics, links to surface tectonics and magmatism, subduction-mantle interactions, mantle upwellings, and evolution of Earth’s interior across disciplines such as geodynamics, seismology, mineral physics, and geochemistry.

• MR - Mineral and Rock Physics
• P - Planetary Sciences
• S - Seismology
• V - Volcanology, Geochemistry and Petrology