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- W4387611259 abstract "Classic lamellar clinopyroxene-ilmenite intergrowths (type 1) are extended to include discovery of olivine-ilmenite-perovskite-wüstite (type 2) and olivine-spinel-perovskite (type 3) xenoliths in kimberlites from Liberia. Low titanium solubilities in olivine, garnet, and pyroxene cannot account for exsolution-like relations. Because the oxides coexist with high-pressure perovskite-structured silicate minerals in diamond, a permissive conclusion is that type 1 to type 3 xenoliths are of super-deep origin. Phase equilibria and thermodynamic studies show that type 1 xenoliths are stable at P > 80 GPa, with type 2 and type 3 at 35 to 50 GPa consistent with an origin in anomalous large low shear velocity province bodies anchored at the core-mantle boundary. Dissociated precursor perovskite-structured Ca-Fe-Ti bridgmanite is proposed and is indirectly supported by the copresence of type II diamonds with a sublithospheric lower mantle origin." @default.
- W4387611259 created "2023-10-14" @default.
- W4387611259 creator A5033056627 @default.
- W4387611259 date "2023-10-13" @default.
- W4387611259 modified "2023-10-18" @default.
- W4387611259 title "Perovskite-bearing crystal-controlled oxide-silicate mantle xenoliths: Resolution to controversial origins?" @default.
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- W4387611259 doi "https://doi.org/10.1126/sciadv.adg1910" @default.
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