Elasticity of ferropericlase across the spin crossover in the Earth’s lower mantle

Yang, Jing; Tong, Xinyue; Lin, Jung-Fu; Okuchi, Takuo; Tomioka, Naotaka

doi:10.1038/srep17188

Title: Elasticity of ferropericlase across the spin crossover in the Earth’s lower mantle

Journal Article · Tue Dec 01 00:00:00 EST 2015 · Scientific Reports

DOI:https://doi.org/10.1038/srep17188· OSTI ID:1240833

Yang, Jing ^[1]; Tong, Xinyue ^[1]; Lin, Jung-Fu ^[2]; Okuchi, Takuo ^[3]; Tomioka, Naotaka ^[3]

Univ. of Texas, Austin, TX (United States). Department of Geological Sciences, Jackson School of Geosciences
Univ. of Texas, Austin, TX (United States). Department of Geological Sciences, Jackson School of Geosciences; Center for High Pressure Science and Technology Advanced Research, (China)
Institute for Study of the Earth's Interior, Misasa, Tottori (Japan)

The effects of the spin transition on the physics and chemistry of the lower-mantle ferropericlase and perovskite have been suggested to have significant consequences on the seismology and geochemistry. Knowing the elasticity of ferropericlase across the spin transition can help explain seismic and mineralogical models of the lower-mantle including the origin of seismic heterogeneities in the middle to lowermost parts of the lower mantle. However, full elastic tensors of ferropericlase within the spin transition and in the low-spin state remains experimentally controversial due to technical challenges in directly measuring sound velocities under lower-mantle conditions. Here we have reliably measured both VP and VS of a single-crystal ferropericlase ((Mg_0.92,Fe_0.08)O) using complementary Brillouin Light Scattering and Impulsive Stimulated Light Scattering coupled with diamond anvil cell (DAC) up to 96 GPa. The derived elastic tensors show drastically softened C₁₁ and C₁₂ within the spin transition at 40-60 GPa while C₄₄ is not affected. Based on thermoelastic modelling along an expected geotherm, the spin crossover in ferropericlase can contribute to elastic abnormalities at mid lower-mantle conditions. Furthermore, our results imply the middle to lowermost parts of the lower mantle would exhibit enhanced seismic heterogeneities due to the occurrence of the mixed-spin and low-spin ferropericlase.

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Research Organization:: Univ. of Chicago, Argonne, IL (United States); Carnegie Institution of Washington, Washington, D.C. (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-06CH11357; NA0002006

OSTI ID:: 1240833

Alternate ID(s):: OSTI ID: 1335494

Journal Information:: Scientific Reports, Vol. 5; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 42 works

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Elastic Softening of (Mg _0.8 Fe _0.2 )O Ferropericlase Across the Iron Spin Crossover Measured at Seismic Frequencies Marquardt, H.; Buchen, J.; Mendez, A. S. J. Geophysical Research Letters, Vol. 45, Issue 14 https://doi.org/10.1029/2018gl077982	journal	July 2018
The extreme acoustic anisotropy and fast sound velocities of cubic high-pressure ice polymorphs at Mbar pressure Zhang, Jin S.; Hao, M.; Ren, Z. Applied Physics Letters, Vol. 114, Issue 19 https://doi.org/10.1063/1.5096989	journal	May 2019
Effects of iron on the lattice thermal conductivity of Earth’s deep mantle and implications for mantle dynamics Hsieh, Wen-Pin; Deschamps, Frédéric; Okuchi, Takuo Proceedings of the National Academy of Sciences, Vol. 115, Issue 16 https://doi.org/10.1073/pnas.1718557115	journal	April 2018
Abnormal Elasticity of Single-Crystal Magnesiosiderite across the Spin Transition in Earth’s Lower Mantle Fu, Suyu; Yang, Jing; Lin, Jung-Fu Physical Review Letters, Vol. 118, Issue 3 https://doi.org/10.1103/physrevlett.118.036402	journal	January 2017
Effects of iron spin transition on the electronic structure, thermal expansivity and lattice thermal conductivity of ferropericlase: a first principles study Song, Yalan; He, Kaihua; Sun, Jian Scientific Reports, Vol. 9, Issue 1 https://doi.org/10.1038/s41598-019-40454-4	journal	March 2019

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