Acoustic velocites of CaSiO3 perovskite

We propose to measure the acoustic velocity of Ti- and/or Al-bearing calcium perovskite (capv), the 3rd most abundant mineral in the lower mantle. The two published studies of capv’s elastic properties have a significantly different temperature dependence, and both diverge significantly from computational results. Our previous work was one of these, reporting vp and vs of capv to ~ 13 GPa & 1500 K on ID06-LVP (see ES-464 and ES-636 reports). We now propose to extend this study, to determine the thermo-elastic properties of capv at pressures extending to 30-35 GPa. Data will overlap conditions of previous work to remeasure temperature derivatives as well as clarifying the pressure dependance of capv’s thermo-elastic properties for more reliable extrapolation to the deep lower mantle. This will contribute directly to the interpretation of lower mantle seismic heterogeneities, and provide a mechanism for fingerprinting recycled material throughout Earth’s mantle.