Composition dependence of spin transition in (Mg,Fe)SiO3 bridgmanite

Dorfman, Susannah M.; Badro, James; Rueff, Jean -Pascal; Chow, Paul; Xiao, Yuming; Gillet, Philippe

doi:10.2138/am-2015-5190

Composition dependence of spin transition in (Mg,Fe)SiO₃ bridgmanite

Journal Article · Thu Oct 01 00:00:00 EDT 2015 · American Mineralogist

DOI:https://doi.org/10.2138/am-2015-5190· OSTI ID:1335651

Dorfman, Susannah M. ^[1]; Badro, James ^[2]; Rueff, Jean -Pascal ^[3]; Chow, Paul ^[4]; Xiao, Yuming ^[4]; Gillet, Philippe ^[5]

Ecole Polytechnique Federale de Lausanne, Lausanne (Switzerland); Carnegie Institution of Washington
Ecole Polytechnique Federale de Lausanne, Lausanne (Switzerland); Univ. Paris Diderot, Paris (France)
Synchrotron SOLEIL, Gif-sur-Yvette (France)
Carnegie Inst. of Washington, Argonne, IL (United States)
Ecole Polytechnique Federale de Lausanne, Lausanne (Switzerland)

Spin transitions in (Mg,Fe)SiO₃ bridgmanite have important implications for the chemistry and dynamics of Earth’s lower mantle, but have been complex to characterize in experiments. We examine the spin state of Fe in highly Fe-enriched bridgmanite synthesized from enstatites with measured compositions (Mg_0.61Fe_0.38Ca_0.01)SiO₃ and (Mg_0.25Fe_0.74Ca_0.01)SiO₃. Bridgmanite was synthesized at 78-88 GPa and 1800-2400 K and X-ray emission spectra were measured on decompression to 1 bar (both compositions) and compression to 126 GPa ((Mg_0.61Fe_0.38Ca_0.01)SiO₃ only) without additional laser heating. Observed spectra confirm that Fe in these bridgmanites is dominantly high spin in the lower mantle. However, the total spin moment begins to decrease at ~50 GPa in the 74% FeSiO₃ composition. Lastly, these results support density functional theory predictions of a lower spin transition pressure in highly Fe-enriched bridgmanite and potentially explain the high solubility of FeSiO₃ in bridgmanite at pressures corresponding to Earth’s deep lower mantle.

View Accepted Manuscript (DOE)

Research Organization:: Carnegie Institution of Washington, Washington, D.C. (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002006

OSTI ID:: 1335651

Alternate ID(s):: OSTI ID: 1222817

Journal Information:: American Mineralogist, Journal Name: American Mineralogist Journal Issue: 10 Vol. 100; ISSN 0003-004X

Publisher:: Mineralogical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (3)

Abnormal Elasticity of Fe-Bearing Bridgmanite in the Earth's Lower Mantle Fu, Suyu; Yang, Jing; Zhang, Yanyao Geophysical Research Letters, Vol. 45, Issue 10 https://doi.org/10.1029/2018gl077764	journal	May 2018
First‐Principles Study of Thermodynamics and Spin Transition in FeSiO ₃ Liquid at High Pressure Sun, Yicheng; Zhou, Huiqun; Yin, Kun Geophysical Research Letters, Vol. 46, Issue 7 https://doi.org/10.1029/2018gl081421	journal	April 2019
The GALAXIES inelastic hard X-ray scattering end-station at Synchrotron SOLEIL Ablett, J. M.; Prieur, D.; Céolin, D. Journal of Synchrotron Radiation, Vol. 26, Issue 1 https://doi.org/10.1107/s160057751801559x	journal	January 2019

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Related Subjects

58 GEOSCIENCES
bridgmanite
iron-bearing silicates
lower mantle
spin transition