Open AccessTracking the origin of ultralow velocity zones at the base of Earth's mantle
Author(s) -
Jiuhua Chen
Publication year - 2020
Publication title -
national science review
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.433
H-Index - 54
eISSN - 2095-5138
pISSN - 2053-714X
DOI - 10.1093/nsr/nwaa308
Subject(s) - eutectic system , mantle (geology) , pyrite , mineralogy , geology , magnesium , materials science , geochemistry , analytical chemistry (journal) , metallurgy , chemistry , environmental chemistry , microstructure
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 FeO 2 H x , 2.3–2.8 for the eutectic melt of Fe + C, 2.7–3.1 for partial melt of (Mg, Fe)SiO 3 + Fe to 3.5–4.5 for iron-rich post-perovskite.
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