Valence and spin states of iron are invisible in Earth’s lower mantle
Abstract
Heterogeneity in Earth’s mantle is a record of chemical and dynamic processes over Earth’s history. The geophysical signatures of heterogeneity can only be interpreted with quantitative constraints on effects of major elements such as iron on physical properties including density, compressibility, and electrical conductivity. However, deconvolution of the effects of multiple valence and spin states of iron in bridgmanite (Bdg), the most abundant mineral in the lower mantle, has been challenging. Here we show through a study of a ferric-iron-only (Mg0.46Fe3+0.53)(Si0.49Fe3+0.51)O3 Bdg that Fe3+ in the octahedral site undergoes a spin transition between 43 and 53 GPa at 300 K. The resolved effects of the spin transition on density, bulk sound velocity, and electrical conductivity are smaller than previous estimations, consistent with the smooth depth profiles from geophysical observations. For likely mantle compositions, the valence state of iron has minor effects on density and sound velocities relative to major cation composition.
- Authors:
-
[1];
[1];
[2];
[2];
[3];
[4];
- Michigan State Univ., East Lansing, MI (United States). Dept. of Earth and Environmental Sciences
- Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Earth and Environmental Sciences
- Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing (China)
- Univ. of Hawaii at Manoa, Honolulu, HI (United States). Hawaii Inst. of Geophysics and Planetology
- Carnegie Inst. of Washington, Argonne, IL (United States). Geophysical Lab., High Pressure Collaborative Access Team (HPCAT)
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Univ. of Illinois, Urbana-Champaign, IL (United States). Dept. of Geology
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Aeronautics and Space Administration (NASA); USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1433056
- Grant/Contract Number:
- AC02-06CH11357; FG02-94ER14466; NA0001974; EAR-1634415; FG02-99ER45775
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; Geophysics; Mineralogy
Citation Formats
Liu, Jiachao, Dorfman, Susannah M., Zhu, Feng, Li, Jie, Wang, Yonggang, Zhang, Dongzhou, Xiao, Yuming, Bi, Wenli, and Alp, E. Ercan. Valence and spin states of iron are invisible in Earth’s lower mantle. United States: N. p., 2018.
Web. doi:10.1038/s41467-018-03671-5.
Liu, Jiachao, Dorfman, Susannah M., Zhu, Feng, Li, Jie, Wang, Yonggang, Zhang, Dongzhou, Xiao, Yuming, Bi, Wenli, & Alp, E. Ercan. Valence and spin states of iron are invisible in Earth’s lower mantle. United States. https://doi.org/10.1038/s41467-018-03671-5
Liu, Jiachao, Dorfman, Susannah M., Zhu, Feng, Li, Jie, Wang, Yonggang, Zhang, Dongzhou, Xiao, Yuming, Bi, Wenli, and Alp, E. Ercan. Thu .
"Valence and spin states of iron are invisible in Earth’s lower mantle". United States. https://doi.org/10.1038/s41467-018-03671-5. https://www.osti.gov/servlets/purl/1433056.
@article{osti_1433056,
title = {Valence and spin states of iron are invisible in Earth’s lower mantle},
author = {Liu, Jiachao and Dorfman, Susannah M. and Zhu, Feng and Li, Jie and Wang, Yonggang and Zhang, Dongzhou and Xiao, Yuming and Bi, Wenli and Alp, E. Ercan},
abstractNote = {Heterogeneity in Earth’s mantle is a record of chemical and dynamic processes over Earth’s history. The geophysical signatures of heterogeneity can only be interpreted with quantitative constraints on effects of major elements such as iron on physical properties including density, compressibility, and electrical conductivity. However, deconvolution of the effects of multiple valence and spin states of iron in bridgmanite (Bdg), the most abundant mineral in the lower mantle, has been challenging. Here we show through a study of a ferric-iron-only (Mg0.46Fe3+0.53)(Si0.49Fe3+0.51)O3 Bdg that Fe3+ in the octahedral site undergoes a spin transition between 43 and 53 GPa at 300 K. The resolved effects of the spin transition on density, bulk sound velocity, and electrical conductivity are smaller than previous estimations, consistent with the smooth depth profiles from geophysical observations. For likely mantle compositions, the valence state of iron has minor effects on density and sound velocities relative to major cation composition.},
doi = {10.1038/s41467-018-03671-5},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {Thu Mar 29 00:00:00 EDT 2018},
month = {Thu Mar 29 00:00:00 EDT 2018}
}
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Lower mantle electrical conductivity based on measurements of Al, Fe-bearing perovskite under lower mantle conditions
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Evidence for a Fe3+-rich pyrolitic lower mantle from (Al,Fe)-bearing bridgmanite elasticity data
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Structural complexity of simple Fe2O3 at high pressures and temperatures
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Density structure of Earth’s lowermost mantle from Stoneley mode splitting observations
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Slab stagnation in the shallow lower mantle linked to an increase in mantle viscosity
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Computational support for a pyrolitic lower mantle containing ferric iron
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Continent-sized anomalous zones with low seismic velocity at the base of Earth's mantle
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Redox-induced lower mantle density contrast and effect on mantle structure and primitive oxygen
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Persistence of strong silica-enriched domains in the Earth’s lower mantle
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Intermediate-spin ferrous iron in lowermost mantle post-perovskite and perovskite
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Anomalous compressibility of ferropericlase throughout the iron spin cross-over
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Spin and valence dependence of iron partitioning in Earth’s deep mantle
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Stability of ferrous-iron-rich bridgmanite under reducing midmantle conditions
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Probabilistic Tomography Maps Chemical Heterogeneities Throughout the Lower Mantle
journal, October 2004
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Iron Partitioning and Density Changes of Pyrolite in Earth’s Lower Mantle
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Redox Heterogeneity in Mid-Ocean Ridge Basalts as a Function of Mantle Source
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- Science, Vol. 340, Issue 6138
Normal-Mode and Free-Air Gravity Constraints on Lateral Variations in Velocity and Density of Earth's Mantle
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Viscosity jump in Earths mid-mantle
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Works referencing / citing this record:
First‐Principles Study of Thermodynamics and Spin Transition in FeSiO 3 Liquid at High Pressure
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Abnormal Elasticity of Fe-Bearing Bridgmanite in the Earth's Lower Mantle
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