Aluminum Components in Bridgmanite Coexisting With Corundum and the CF‐Phase With Temperature

Author:

Wang Lin12ORCID,Liu Zhaodong3ORCID,Koizumi Sanae4ORCID,Ballaran Tiziana Boffa1ORCID,Katsura Tomoo1

Affiliation:

1. Bayerisches Geoinstitut University of Bayreuth Bayreuth Germany

2. Earth and Planetary Laboratory Carnegie Institution Washington Washington DC USA

3. State Key Laboratory of Superhard Materials Jilin University Changchun China

4. Earthquake Research Institute University of Tokyo Tokyo Japan

Abstract

AbstractPhase relations in the MgSiO3–MgAl2O4–Al2O3 system are investigated at 27 GPa and 2000–2600 K using a multi‐anvil apparatus. The AlAlO3 content in the bridgmanite increases from 8.6 to 20.0 mol% with increasing temperature from 2000 to 2600 K, while the MgAlO2.5 content remains nearly constant, that is, 3–4 mol% at these temperatures. Therefore, the presence of an additional Al‐bearing phase suppresses the oxygen vacancy substitution for Al3+ in bridgmanite. Conversely, significant amounts of the Al8/3O4 component can be dissolved into the calcium‐ferrite type MgAl2O4–Mg2SiO4–Al8/3O4 phase (CF‐phase), implying that the CF‐phase likely contains some amount of vacancies. Therefore, the CF‐phase could also be a candidate mineral for transporting volatiles into the lower mantle. Our results, combined with previous studies on Al‐bearing bridgmanite, indicate that, once the Al per formula unit exceeds 0.12 in bridgmanite, the MgAlO2.5 content remains nearly constant and the AlAlO3 component becomes dominant.

Funder

HORIZON EUROPE European Research Council

Japan Society for the Promotion of Science London

Publisher

American Geophysical Union (AGU)

Subject

Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Geochemistry and Petrology,Geophysics

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