The thermal equation of state of (Mg, Fe)SiO3 bridgmanite (perovskite) and implications for lower mantle structures

Wolf, Aaron S.; Jackson, Jennifer M.; Dera, Przemeslaw; Prakapenka, Vitali B.

doi:10.1002/2015JB012108

Title: The thermal equation of state of (Mg, Fe)SiO₃ bridgmanite (perovskite) and implications for lower mantle structures

Journal Article · Tue Sep 29 00:00:00 EDT 2015 · Journal of Geophysical Research. Solid Earth

DOI:https://doi.org/10.1002/2015JB012108· OSTI ID:1233332

Wolf, Aaron S. ^[1]; Jackson, Jennifer M. ^[2]; Dera, Przemeslaw ^[3]; Prakapenka, Vitali B. ^[4]

Univ. of Michigan, Ann Arbor, MI (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States)
California Inst. of Technology (CalTech), Pasadena, CA (United States)
Univ. of Hawaii, Honolulu, HI (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Chicago, Chicago, IL (United States)

The high–pressure/high–temperature equation of state (EOS) of synthetic 13% Fe–bearing bridgmanite (Mg silicate perovskite) is measured using powder X–ray diffraction in a laser–heated diamond anvil cell with a quasi–hydrostatic neon pressure medium. We compare these results, which are consistent with previous 300 K sound speed and compression studies, with a reanalysis of Fe–free Mg end–member data from Tange et al. (2012) to determine the effect of iron on bridgmanite's thermoelastic properties. EOS parameters are incorporated into an ideal lattice mixing model to probe the behavior of bridgmanite at deep mantle conditions. With this model, a nearly pure bridgmanite mantle composition is shown to be inconsistent with density and compressibility profiles of the lower mantle. We also explore the buoyant stability of bridgmanite over a range of temperatures and compositions expected for Large Low–Shear Velocity Provinces, concluding that bridgmanite–dominated thermochemical piles are more likely to be passive dense layers externally supported by convection, rather than internally supported metastable domes. Here, the metastable dome scenario is estimated to have a relative likelihood of only 4–7%, given the narrow range of compositions and temperatures consistent with seismic constraints. If buoyantly supported, such structures could not have remained stable with greater thermal contrast early in Earth's history, ruling out formation scenarios involving a large concentration of heat producing elements.

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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). Chemical Sciences, Geosciences, and Biosciences Division

Grant/Contract Number:: FG02‐94ER14466; AC02‐06CH11357; EAR‐1128799; EAR 11‐57758

OSTI ID:: 1233332

Journal Information:: Journal of Geophysical Research. Solid Earth, Vol. 120, Issue 11; ISSN 2169-9313

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 44 works

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Abrupt climate transition of icy worlds from snowball to moist or runaway greenhouse Yang, Jun; Ding, Feng; Ramirez, Ramses M. Nature Geoscience, Vol. 10, Issue 8 https://doi.org/10.1038/ngeo2994	journal	July 2017
Kinetics and detectability of the bridgmanite to post-perovskite transformation in the Earth's D″ layer Langrand, Christopher; Andrault, Denis; Durand, Stéphanie Nature Communications, Vol. 10, Issue 1 https://doi.org/10.1038/s41467-019-13482-x	journal	December 2019
Formation of bridgmanite-enriched layer at the top lower-mantle during magma ocean solidification Xie, Longjian; Yoneda, Akira; Yamazaki, Daisuke Nature Communications, Vol. 11, Issue 1 https://doi.org/10.1038/s41467-019-14071-8	journal	January 2020
Morphology of seismically slow lower-mantle structures Cottaar, Sanne; Lekic, Vedran Geophysical Journal International, Vol. 207, Issue 2 https://doi.org/10.1093/gji/ggw324	journal	August 2016
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Evaluating the Role of Iron-Rich (Mg,Fe)O in Ultralow Velocity Zones Dobrosavljevic, Vasilije V.; Sturhahn, Wolfgang; Jackson, Jennifer M. Minerals, Vol. 9, Issue 12 https://doi.org/10.3390/min9120762	journal	December 2019
Kinetics and detectability of the bridgmanite to post-perovskite transformation in the Earth's D″ layer Langrand, Christopher; Andrault, Denis; Durand, Stéphanie Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2019-05161	text	January 2019
Morphology of seismically slow lower-mantle structures Cottaar, Sanne; Lekic, V. Apollo - University of Cambridge Repository https://doi.org/10.17863/cam.6254	text	January 2016
Abrupt climate transition of icy worlds from snowball to moist or runaway greenhouse Yang, Jun; Ding, Feng; Ramirez, Ramses M. arXiv https://doi.org/10.48550/arxiv.1809.01418	text	January 2018

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Title: The thermal equation of state of (Mg, Fe)SiO3 bridgmanite (perovskite) and implications for lower mantle structures

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Title: The thermal equation of state of (Mg, Fe)SiO₃ bridgmanite (perovskite) and implications for lower mantle structures