Stability of ferrous-iron-rich bridgmanite under reducing midmantle conditions

Shim, Sang-Heon; Grocholski, Brent; Ye, Yu; Alp, E. Ercan; Xu, Shenzhen; Morgan, Dane; Meng, Yue; Prakapenka, Vitali B.

doi:10.1073/pnas.1614036114

Title: Stability of ferrous-iron-rich bridgmanite under reducing midmantle conditions

Journal Article · Mon Jun 05 00:00:00 EDT 2017 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1614036114· OSTI ID:1376706

^[1]; Grocholski, Brent ^[2]; Ye, Yu ^[3]; Alp, E. Ercan ^[4]; Xu, Shenzhen ^[5]; Morgan, Dane ^[5]; Meng, Yue ^[6]; Prakapenka, Vitali B. ^[1]

Arizona State Univ., Tempe, AZ (United States)
Smithsonian Inst., Washington, DC (United States)
Arizona State Univ., Tempe, AZ (United States); China Univ. of Geosciences at Wuhan (China)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Univ. of Wisconsin, Madison, WI (United States)
Carnegie Inst. of Science, Washington, DC (United States)

Our current understanding of the electronic state of iron in lower-mantle minerals leads to a considerable disagreement in bulk sound speed with seismic measurements if the lower mantle has the same composition as the upper mantle (pyrolite). In the modeling studies, the content and oxidation state of Fe in the minerals have been assumed to be constant throughout the lower mantle. Here, we report high-pressure experimental results in which Fe becomes dominantly Fe²⁺in bridgmanite synthesized at 40–70 GPa and 2,000 K, while it is in mixed oxidation state (Fe³⁺/ΣFe = 60%) in the samples synthesized below and above the pressure range. Little Fe³⁺in bridgmanite combined with the strong partitioning of Fe²⁺into ferropericlase will alter the Fe content for these minerals at 1,100- to 1,700-km depths. Further, our calculations show that the change in iron content harmonizes the bulk sound speed of pyrolite with the seismic values in this region. Our experiments support no significant changes in bulk composition for most of the mantle, but possible changes in physical properties and processes (such as viscosity and mantle flow patterns) in the midmantle.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-06CH11357; EAR1316022; EAR1338810; EAR-1128799; FG02-94ER14466; NA0001974; FG02-99ER45775

OSTI ID:: 1376706

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Vol. 114, Issue 25; ISSN 0027-8424

Publisher:: National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 43 works

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58 GEOSCIENCES
ferrous-iron-rich
bridgmanite
lower mantle
oxidation state
spin transition
bulk sound speed

Title: Stability of ferrous-iron-rich bridgmanite under reducing midmantle conditions

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