Abstract
Geophysics The deepest regions of Earth's rocky mantle have poorly understood areas with suspiciously low seismic velocities called large low-shear-velocity provinces (LLSVPs). Thomson et al. suggest that the abundant but often neglected mantle mineral calcium silicate perovskite might have much lower shear-wave velocity when it holds a bit of titanium in the structure than previously believed. Adding this new velocity to a mineralogical model of recycled ocean crust makes the crust a candidate to explain the low velocities of the LLSVPs. Nature 572 , 643 (2019).
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