Seismic detectability of the boundaries and convection in the mantle is strongly influenced by the thicknesses and Clapeyron slopes of mantle phase boundaries. The unusually large positive Clapeyron slope found for the boundary between perovskite and post-perovskite (the 'pPv boundary') would destabilize high-temperature anomalies in the lowermost mantle, in disagreement with the seismic observations. Here, new studies of the thickness and Clapeyron slope of the pPv boundary shed light on this matter.
- Krystle Catalli
- Sang-Heon Shim
- Vitali Prakapenka
