Core-Mantle Interface - Thermodynamics and chemistryA 5-year multidisciplinary project funded by the European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013) / ERC Grant agreement 240473.
We (Walker et al., G3, 2011) use a global model of mantle flow to derive the predicted elastic anisotropy in D″. We seek to test the hypothesis that post-perovskite (the mineral phase believed to be present at the base of the mantle) can cause the observed seismic anisotropy in the lowermost mantle by aligning in response to flow; specifically, by forming a lattice preferred orientation by dislocation glide.
We test three different models of slip in post-perovskite and compare the predicted P and S wave anisotropy to global observations (Panning & Romanowicz, 2006, GJI; Panning et al., JGR, 2010; Kustowski et al., JGR, 2008). We find that formation of texture in post-perovskite by slip on (010) or (100) planes best matches observations.