Fig. 6: Schematic diagrams showing the plate configuration and deep Earth water recycling.
From: Heavy boron isotopes in plume-derived magmas trace recycled water in deep-mantle reservoir
a The Late Permian global plate configuration with the paleogeographic position of the South China Block and the Emeishan mantle plume. The plate configuration is based on Scotese et al.102. b Geodynamic model showing the deep water recycling via subduction of slab serpentinites. The plume (red column) passes through the transition zone, which contains subducted slab serpentinite-derived H2O and B in DHMS and/or metamorphic olivine. The plume may entrain hydours materials (light blue circles) from the transition zone5, thereby introducing H2O and B into the mantle plume. Further ascent of the plume generates more melt during decompression (large ellipse). The blue shapes within the ellipse represent the fluid component in the mantle source, while the grey and dark shapes reflect the fusible and depleted mantle components of the source, respectively.
