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Iron partitioning in pyrolitic lower mantle

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Abstract

The partitioning of iron between Mg-rich perovskite (Pv) and ferropericlase (Fp) was investigated for a pyrolitic bulk composition over a wide range of simulated lower-mantle pressures and temperatures from 28 to 114 GPa and from 1,900 to 2,300 K, in a laser-heated diamond anvil cell (DAC). The recovered DAC samples are chemically homogeneous, indicating a relatively small temperature gradient during laser heating. The chemical compositions of coexisting Pv, Fp, and Ca-rich perovskite (CaPv) were determined by energy-dispersive X-ray spectroscopy (EDS) using an EDS instrument attached to a transmission electron microscope. Our results demonstrate that at pressures above 90 GPa, Pv becomes more Fe-rich with increasing pressure, which is likely due to the effects of high-spin to low-spin crossover of Fe3+ in Pv. We highlight that such a change in Fe–Mg partitioning between Pv and Fp should have a strong influence on the physical properties of the deep lower mantle.

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Acknowledgments

R. S. was supported by a Research Fellowship for Young Scientists and a Postdoctoral Fellowship for Research Abroad, granted by JSPS. Review comments by two anonymous referees and editor helped significantly in improving the manuscript.

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  1. Ryosuke Sinmyo

    Present address: Bayerisches Geoinstitut, Universität Bayreuth, 95440, Bayreuth, Germany

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  1. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Tokyo, Japan

    Ryosuke Sinmyo & Kei Hirose

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  1. Ryosuke Sinmyo
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Correspondence to Ryosuke Sinmyo.

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Sinmyo, R., Hirose, K. Iron partitioning in pyrolitic lower mantle. Phys Chem Minerals 40, 107–113 (2013). https://doi.org/10.1007/s00269-012-0551-7

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