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  • Title: Tracking the origin of ultralow velocity zones at the base of Earth's mantle.
    Author: Chen J.
    Journal: Natl Sci Rev; 2021 Apr; 8(4):nwaa308. PubMed ID: 34691621.
    Abstract:
    Origins of the ultralow velocity zones may be classified by their velocity-reduction-ratio, R = δ lnVS/δ lnVP, which ranges from 1.2-1.5 for iron oxides or iron-enriched magnesium oxides, 1.6-2.0 for pyrite-type FeO2Hx, 2.3-2.8 for the eutectic melt of Fe + C, 2.7-3.1 for partial melt of (Mg, Fe)SiO3 + Fe to 3.5-4.5 for iron-rich post-perovskite.
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