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Seismological Expression of the Iron Spin Crossover in Ferropericlase in the Earth’s Lower Mantle

Seismological Expression of the Iron Spin Crossover in Ferropericlase in the Earth’s Lower Mantle

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: http://doi.org/10.1038/s41467-021-26115-z. This is version 4 of this Preprint.

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Authors

Grace Shephard, Christine Houser, John Hernlund, Juan J. Valencia-Cardona, Reidar Trønnes, Renata Wentzkovitch

Abstract

The two most abundant minerals on Earth which together make up over 90% of the Earth’s lower mantle are (Mg,Fe)O-ferropericlase (Fp) and (Mg,Fe)SiO3-bridgmanite (Bm). Iron in Fp undergoes a high-spin to low-spin (HS-LS) crossover that influences density, viscosity, elasticity, thermal conductivity, and elemental partitioning, however, the predicted effects of this transition are not apparent in global 1D seismic velocity profiles. This discrepancy suggests that the predictions are inaccurate, seismic resolution is insufficient to resolve the effects, or a substantial portion of the mid-lower mantle is relatively SiO2-rich (hence Fp poor) comp...  more

DOI

https://doi.org/10.31223/osf.io/deuck

Subjects

Earth Sciences, Geochemistry, Geophysics and Seismology, Mineral Physics, Physical Sciences and Mathematics, Physics, Quantum Physics, Tectonics and Structure

Keywords

Dates

Published: 2020-06-29 21:47

Last Updated: 2021-10-21 07:00

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License

GNU Lesser General Public License (LGPL) 2.1

Additional Metadata

Data Availability (Reason not available):
Temporary file link only http://folk.uio.no/gracees/Shephard_etal_2020_Submitted/ Please contact corresponding author for more details