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Published July 15, 2016 | Version v1
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Stability of Fe,Al-bearing bridgmanite in the lower mantle and synthesis of pure Fe-bridgmanite

Creators

  • 1. University of Bayreuth
  • 2. Moscow State University
  • 3. Deutsches Elektronen-Synchrotron
  • 4. European Synchrotron Radiation Facility
  • 5. University of Chicago

Description

The physical and chemical properties of Earth's mantle, as well as its dynamics and evolution, heavily depend on the phase composition of the region. On the basis of experiments in laser-heated diamond anvil cells, we demonstrate that Fe,Al-bearing bridgmanite (magnesium silicate perovskite) is stable to pressures over 120 GPa and temperatures above 3000 K. Ferric iron stabilizes Fe-rich bridgmanite such that we were able to synthesize pure iron bridgmanite at pressures between ~45 and 110 GPa. The compressibility of ferric iron–bearing bridgmanite is significantly different from any known bridgmanite, which has direct implications for the interpretation of seismic tomography data.

Data availability

All data needed to evaluate the conclusions in the paper are present in the paper and/or the Supplementary Materials. Additional data related to this paper may be requested from the authors.

Files

sciadv.1600427.pdf

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Additional details

Identifiers

DOI
10.1126/sciadv.1600427
Other
oai:uchicago.tind.io:11064

Funding

Russian Foundation for Basic Research
16-05-00419
National Science Foundation - Earth Sciences
EAR-1128799
Department of Energy- GeoSciences
DE-FG02-94ER14466

UChicago Information

Division(s)
Institutes & Centers
Center(s) or Institute(s)
Center for Advanced Radiation Sources