Stability of Fe,Al-bearing bridgmanite in the lower mantle and synthesis of pure Fe-bridgmanite
- Ismailova, L.
- Bykova, E.
- Liermann, H.-P.
- Kupenko, I.
- Hanfland, M.
- Prescher, C.
- Prakapenka, V.
- Svitlyk, V.
- Dubrovinsky, L.
- Bykov, M.
- Cerantola, V.
- McCammon, C.
- Boffa Ballaran, T.
- Bobrov, A.
- Sinmyo, R.
- Dubrovinskaia, N.
- Glazyrin, K.
Publication date
January 2016
DOI Publisher
American Association for the Advancement of Science (AAAS)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 suchthat 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
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