Data from: Acoustic and electrical properties of Fe-Ti oxides with application to the deep lunar mantle

The overturn of titanium-rich mantle cumulates has been invoked to explain
the structure and dynamics of the Moon. These dense cumulates are stable
at the core-mantle boundary (CMB) and could explain field anomalies
inferred from geophysical studies. We report the first acoustic and
electrical experiments on natural ilmenite-rutile aggregates up to 4.5 GPa
and 1920 K. Seismic velocities show a weak pressure and temperature
dependence, with Vs ~4.2 (+/-0.2) km/s and Vp ~ 8.0 (+/-0.2) km/s at the
CMB conditions. Conductivity increases by a factor > 104 over
373-1920 K and is >103 S/m above 1573 K. Seismic and electrical
mixing models of Fe-Ti oxides - olivine rocks based on our results
indicate that field velocity and conductivity estimates are reproduced
satisfactorily with 3-16% Fe-Ti oxides and 20% melt. Interactions between
this Ti-rich and melt-bearing layer and the adjacent core likely affect
the cooling and magnetic history of the Moon.