Composition and Pressure Effects on Partitioning of Ferrous Iron in Iron-Rich Lower Mantle Heterogeneities

Dorfman, Susannah M.; Nabiei, Farhang; Boukaré, Charles-Edouard; Prakapenka, Vitali B.; Cantoni, Marco; Badro, James; Gillet, Philippe

doi:10.3390/min11050512

Composition and Pressure Effects on Partitioning of Ferrous Iron in Iron-Rich Lower Mantle Heterogeneities

Journal Article · Wed May 12 00:00:00 EDT 2021 · Minerals

DOI:https://doi.org/10.3390/min11050512· OSTI ID:1782876

; Nabiei, Farhang; Boukaré, Charles-Edouard; ; Cantoni, Marco; Badro, James; Gillet, Philippe

Both seismic observations of dense low shear velocity regions and models of magma ocean crystallization and mantle dynamics support enrichment of iron in Earth’s lowermost mantle. Physical properties of iron-rich lower mantle heterogeneities in the modern Earth depend on distribution of iron between coexisting lower mantle phases (Mg,Fe)O magnesiowüstite, (Mg,Fe)SiO3 bridgmanite, and (Mg,Fe)SiO3 post-perovskite. The partitioning of iron between these phases was investigated in synthetic ferrous-iron-rich olivine compositions (Mg0.55Fe0.45)2SiO4 and (Mg0.28Fe0.72)2SiO4 at lower mantle conditions ranging from 33–128 GPa and 1900–3000 K in the laser-heated diamond anvil cell. The resulting phase assemblages were characterized by a combination of in situ X-ray diffraction and ex situ transmission electron microscopy. The exchange coefficient between bridgmanite and magnesiowüstite decreases with pressure and bulk Fe# and increases with temperature. Thermodynamic modeling determines that incorporation and partitioning of iron in bridgmanite are explained well by excess volume associated with Mg-Fe exchange. Partitioning results are used to model compositions and densities of mantle phase assemblages as a function of pressure, FeO-content and SiO2-content. Unlike average mantle compositions, iron-rich compositions in the mantle exhibit negative dependence of density on SiO2-content at all mantle depths, an important finding for interpretation of deep lower mantle structures.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-94ER14466

OSTI ID:: 1782876

Alternate ID(s):: OSTI ID: 1783883

Journal Information:: Minerals, Journal Name: Minerals Journal Issue: 5 Vol. 11; ISSN MBSIBI; ISSN 2075-163X

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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