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

Journal Article · · Journal of Geophysical Research. Solid Earth
DOI:https://doi.org/10.1002/2015JB012108· OSTI ID:1233332
 [1];  [2];  [3];  [4]
  1. Univ. of Michigan, Ann Arbor, MI (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  3. Univ. of Hawaii, Honolulu, HI (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  4. 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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Science Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
FG02-94ER14466; AC02-06CH11357
OSTI ID:
1233332
Journal Information:
Journal of Geophysical Research. Solid Earth, Journal Name: Journal of Geophysical Research. Solid Earth Journal Issue: 11 Vol. 120; ISSN 2169-9313
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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Cited By (12)

The elastic solid solution model for minerals at high pressures and temperatures journal January 2018
First‐Principles Study of Thermodynamics and Spin Transition in FeSiO 3 Liquid at High Pressure journal April 2019
Lower Mantle Dynamics Perceived With 50 Years of Hindsight From Plate Tectonics journal December 2019
Abrupt climate transition of icy worlds from snowball to moist or runaway greenhouse journal July 2017
Kinetics and detectability of the bridgmanite to post-perovskite transformation in the Earth's D″ layer journal December 2019
Formation of bridgmanite-enriched layer at the top lower-mantle during magma ocean solidification journal January 2020
Morphology of seismically slow lower-mantle structures journal August 2016
Morphology of seismically slow lower-mantle structures text January 2016
Kinetics and detectability of the bridgmanite to post-perovskite transformation in the Earth's D″ layer text January 2019
Water, Hydrous Melting, and Teleseismic Signature of the Mantle Transition Zone journal December 2019
Evaluating the Role of Iron-Rich (Mg,Fe)O in Ultralow Velocity Zones journal December 2019
Abrupt climate transition of icy worlds from snowball to moist or runaway greenhouse text January 2018

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