Stability of Fe,Al-bearing bridgmanite in the lower mantle and synthesis of pure Fe-bridgmanite

Leyla Ismailova; Elena Bykova; Maxim Bykov; Valerio Cerantola; Catherine McCammon; Tiziana Boffa Ballaran; Andrei Bobrov; Ryosuke Sinmyo; Natalia Dubrovinskaia; Konstantin Glazyrin; Hanns-Peter Liermann; Ilya Kupenko; Michael Hanfland; Clemens Prescher; Vitali Prakapenka; Volodymyr Svitlyk; Leonid Dubrovinsky

doi:10.1126/sciadv.1600427

Stability of Fe,Al-bearing bridgmanite in the lower mantle and synthesis of pure Fe-bridgmanite

Sci Adv. 2016 Jul 15;2(7):e1600427. doi: 10.1126/sciadv.1600427. eCollection 2016 Jul.

Authors

Leyla Ismailova¹, Elena Bykova², Maxim Bykov², Valerio Cerantola³, Catherine McCammon², Tiziana Boffa Ballaran², Andrei Bobrov⁴, Ryosuke Sinmyo², Natalia Dubrovinskaia⁵, Konstantin Glazyrin⁶, Hanns-Peter Liermann⁶, Ilya Kupenko⁷, Michael Hanfland⁸, Clemens Prescher⁹, Vitali Prakapenka⁹, Volodymyr Svitlyk⁸, Leonid Dubrovinsky²

Affiliations

¹ Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany.; Laboratory of Crystallography, University of Bayreuth, D-95440 Bayreuth, Germany.
² Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany.
³ Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany.; European Synchrotron Radiation Facility, BP 220, Grenoble F-38043, France.
⁴ Department of Petrology, Geological Faculty, Moscow State University, 119234 Moscow, Russia.
⁵ Laboratory of Crystallography, University of Bayreuth, D-95440 Bayreuth, Germany.
⁶ Photon Science, Deutsches Elektronen-Synchrotron, Notkestrasse 85, D-22603 Hamburg, Germany.
⁷ Bayerisches Geoinstitut, University of Bayreuth, D-95440 Bayreuth, Germany.; European Synchrotron Radiation Facility, BP 220, Grenoble F-38043, France.; Institut für Mineralogie, University of Münster, Corrensstrasse 24, 48149 Münster, Germany.
⁸ European Synchrotron Radiation Facility, BP 220, Grenoble F-38043, France.
⁹ Center for Advanced Radiation Sources, University of Chicago, 9700 South Cass Avenue, Argonne, IL 60437, USA.

Abstract

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.

Keywords: Bridgmanite; diamond anvil cell; laser heating; lower mantle; single crystal x-ray diffraction.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

Aluminum / chemistry*
Calcium Compounds / chemical synthesis
Calcium Compounds / chemistry*
Earth, Planet
Iron / chemistry*
Magnesium Silicates / chemical synthesis
Magnesium Silicates / chemistry*
Oxides / chemical synthesis
Oxides / chemistry*
Pressure
Temperature
Titanium / chemistry*
X-Ray Diffraction

Substances

Calcium Compounds
Magnesium Silicates
Oxides
perovskite
Aluminum
Titanium
Iron