Figure 2.

Water content of mantle cumulates from equilibrium partitioning between magma ocean liquids and fractionating solids. Interstitial liquids are not included in the model. Model results are shown for a 2000 km deep terrestrial magma ocean with an initial water content of 0.25 wt%. Light grey lines denote cumulate water content before overturn. Black lines depict the pre-overturn water contents of modelled cumulate layers, displayed at the post-overturn depth of the modelled layers. Driven by their high density, these water-rich layers would have dewatered as they sank through the transition zone. Radius ranges with two post-overturn values are regions where cumulates from two initial depths (and thus different compositions and mineralogies) have the same densities, and would settle adjacent to each other at the same radius range on some wavelength. (Online version in colour.)