Fig. 4: Global super-adiabatic temperature field and divergence of the velocity field.
From: Global mantle convection models produce transform offsets along divergent plate boundaries
Four viewing angles are shown, corresponding to the case presented in Fig. 1c, d. All panels in this figure are from the same time as Fig. 1d. The indicated rotation angles Ï• are as defined in Fig. 1. In the left column, (panels a, c, e, g, with rotation angles of 0, 90, 180 and 270 degrees) isosurfaces are depicted for non-dimensional super-adiabatic temperatures of 0.85 (red) and 0.4 (blue), rendering hot plumes rising from the core-mantle-boundary and cold slabs sinking below convergent boundaries. The top 5% of the thermal field is removed (effectively removing the model plates at the surface) in order to allow viewing into the interior. Two hot plumes that reach the base of the lithosphere are marked A and B in the left column. Arc-like cyan features are shown at a depth of 12 km and correspond to regions with a divergence less than −3 × 104. Similarly, yellow lineations show regions at 12 km depth with a divergence greater than 3 × 104. In the right column (panels b, d, f and h, with rotation angles of 0, 90, 180 and 270 degrees) the full divergence field is depicted at a depth of 12 km for viewing angles corresponding to the left column panels. The full range of values in the divergence fields is indicated in the colour bar. (Alternative viewing angles are included in Supplementary Figs. 6 and 7.).
