Persistence of Strong Silica-Enriched Domains in the Earth's Lower Mantle

Maxim D. Ballmer, Christine Houser, John W. Hernlund +2

The composition of the lower mantle $-$ comprising 56% of Earth's volume $-$ remains poorly constrained. Among the major elements, Mg/Si ratios ranging from $\sim$0.9$-$1.1, such a…