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

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 stab...

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Detalles Bibliográficos
Autores principales: Ismailova, Leyla, Bykova, Elena, Bykov, Maxim, Cerantola, Valerio, McCammon, Catherine, Boffa Ballaran, Tiziana, Bobrov, Andrei, Sinmyo, Ryosuke, Dubrovinskaia, Natalia, Glazyrin, Konstantin, Liermann, Hanns-Peter, Kupenko, Ilya, Hanfland, Michael, Prescher, Clemens, Prakapenka, Vitali, Svitlyk, Volodymyr, Dubrovinsky, Leonid
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2016
Materias:
Research Articles
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4956391/
https://www.ncbi.nlm.nih.gov/pubmed/27453945
http://dx.doi.org/10.1126/sciadv.1600427
Descripción
Sumario: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.

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