The stability of Fe5O6 and Fe4O5 at high pressure and temperature
-
Koutaro Hikosaka
,
Ryosuke Sinmyo
Abstract
The oxygen fugacity in the interior of the Earth is largely controlled by iron-bearing minerals. Recent studies have reported various iron oxides with chemical compositions between FeO and Fe3O4 above ~10 GPa. However, the stabilities of these high-pressure iron oxides remain mostly uninvestigated. In this study, we performed in situ X-ray diffraction (XRD) measurements in a laser-heated diamond-anvil cell (DAC) to determine the phase relations in both Fe5O6 and Fe4O5 bulk compositions to 61 GPa and to 2720 K. The results show that Fe5O6 is a high-temperature phase stable above 1600 K and ~10 GPa, while FeO + Fe4O5 are formed at relatively low temperatures. We observed the decomposition of Fe5O6 into 2FeO + Fe3O4 above 38 GPa and the decomposition of Fe4O5 into FeO + h-Fe3O4 at a similar pressure range. The coexistence of FeO and Fe3O4 indicates that none of the recently discovered compounds between FeO and Fe3O4 (i.e., Fe5O6, Fe9O11, Fe4O5, and Fe7O9) are formed beyond ~40 GPa at 1800 K, corresponding to conditions in the shallow lower mantle. Additionally, as some superdeep diamonds have genetic links with these high-pressure iron oxides, our results give constraints on pressure and temperature conditions of their formation.
Acknowledgments and Funding
Synchrotron XRD data were collected at BL10XU, SPring-8 (proposal no. 2017B0072, 2018A0072, and 2018B0072). We thank Y. Kuwayama for his help in the measurements. Comments provided from three anonymous reviewers helped improve the manuscript.
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Articles in the same Issue
- Highlights and Breakthroughs
- Seeking the most hydrous, primitive arc melts: The glass is half full
- Hydrous LABZ beneath a subduction zone was reconstructed for the first time
- U, Th, and K partitioning between metal, silicate, and sulfide and implications for Mercury’s structure, volatile content, and radioactive heat production
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- An analysis of the magnetic behavior of olivine and garnet substitutional solid solutions
- Pyrite trace-element and sulfur isotope geochemistry of paleo-mesoproterozoic McArthur Basin: Proxy for oxidative weathering
- Compressional behavior and spin state of δ-(Al,Fe)OOH at high pressures
- Reconstruction of the lithosphere-asthenosphere boundary zone beneath Ichinomegata maar, Northeast Japan, by geobarometry of spinel peridotite xenoliths
- High-pressure phase stability and elasticity of ammonia hydrate
- A multi-methodological study of kurnakovite: A potential B-rich aggregate
- Identification of the occurrence of minor elements in the structure of diatomaceous opal using FIB and TEM-EDS
- Nixonite, Na2Ti6O13, a new mineral from a metasomatized mantle garnet pyroxenite from the western Rae Craton, Darby kimberlite field, Canada
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- Edscottite, Fe5C2, a new iron carbide mineral from the Ni-rich Wedderburn IAB iron meteorite
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