Fig. 6
Model set-up. a Initial condition for a subducting plate 100 Myr old at the reference mantle temperature (ΔTpot = 0 °C). Colours indicate temperature and the horizontal black lines mark the olivine phase transitions. The zoomed area shows corresponding viscosity where the weak layer on top of the plate is visible (dark blue). Background mantle temperature (b) and viscosity (c) profiles (at the MOR) for the five investigated mantle potential temperatures. The colour scale is used to identify different model cases in the main text, and ranges from black (ΔTpot = − 50 °C) for the colder mantle temperature case to red (ΔTpot = + 200 °C) for hottest mantle case
