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Article

The Effect of Pulsed Laser Heating on the Stability of Ferropericlase at High Pressures

1
Materials Physics and Technology at Extreme Conditions, Laboratory of Crystallography, Universität Bayreuth, D-95440 Bayreuth, Germany
2
Deutsches Elektronen-Synchrotron (DESY), D-22607 Hamburg, Germany
3
Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
4
ESRF–The European Synchrotron, CS 40220, CEDEX 9, 38043 Grenoble, France
5
Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(6), 542; https://doi.org/10.3390/min10060542
Received: 29 April 2020 / Revised: 2 June 2020 / Accepted: 11 June 2020 / Published: 16 June 2020
(This article belongs to the Special Issue Minerals under Extreme Conditions)
It is widely accepted that the lower mantle consists of mainly three major minerals—ferropericlase, bridgmanite and calcium silicate perovskite. Ferropericlase ((Mg,Fe)O) is the second most abundant of the three, comprising approximately 16–20 wt% of the lower mantle. The stability of ferropericlase at conditions of the lowermost mantle has been highly investigated, with controversial results. Amongst other reasons, the experimental conditions during laser heating (such as duration and achieved temperature) have been suggested as a possible explanation for the discrepancy. In this study, we investigate the effect of pulsed laser heating on the stability of ferropericlase, with a geochemically relevant composition of Mg0.76Fe0.24O (Fp24) at pressure conditions corresponding to the upper part of the lower mantle and at a wide temperature range. We report on the decomposition of Fp24 with the formation of a high-pressure (Mg,Fe)3O4 phase with CaTi2O4-type structure, as well as the dissociation of Fp24 into Fe-rich and Mg-rich phases induced by pulsed laser heating. Our results provide further arguments that the chemical composition of the lower mantle is more complex than initially thought, and that the compositional inhomogeneity is not only a characteristic of the lowermost part, but includes depths as shallow as below the transition zone. View Full-Text
Keywords: ferropericlase; laser-heated diamond anvil cell (LHDAC); lower mantle; diamond anvil cell; pulsed laser heating ferropericlase; laser-heated diamond anvil cell (LHDAC); lower mantle; diamond anvil cell; pulsed laser heating
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MDPI and ACS Style

Aprilis, G.; Pakhomova, A.; Chariton, S.; Khandarkhaeva, S.; Melai, C.; Bykova, E.; Bykov, M.; Fedotenko, T.; Koemets, E.; McCammon, C.; Chumakov, A.I.; Hanfland, M.; Dubrovinskaia, N.; Dubrovinsky, L. The Effect of Pulsed Laser Heating on the Stability of Ferropericlase at High Pressures. Minerals 2020, 10, 542. https://doi.org/10.3390/min10060542

AMA Style

Aprilis G, Pakhomova A, Chariton S, Khandarkhaeva S, Melai C, Bykova E, Bykov M, Fedotenko T, Koemets E, McCammon C, Chumakov AI, Hanfland M, Dubrovinskaia N, Dubrovinsky L. The Effect of Pulsed Laser Heating on the Stability of Ferropericlase at High Pressures. Minerals. 2020; 10(6):542. https://doi.org/10.3390/min10060542

Chicago/Turabian Style

Aprilis, Georgios, Anna Pakhomova, Stella Chariton, Saiana Khandarkhaeva, Caterina Melai, Elena Bykova, Maxim Bykov, Timofey Fedotenko, Egor Koemets, Catherine McCammon, Aleksandr I. Chumakov, Michael Hanfland, Natalia Dubrovinskaia, and Leonid Dubrovinsky. 2020. "The Effect of Pulsed Laser Heating on the Stability of Ferropericlase at High Pressures" Minerals 10, no. 6: 542. https://doi.org/10.3390/min10060542

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