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The spin state of iron in minerals of Earth's lower mantle

Sturhahn, Wolfgang and Jackson, Jennifer M. and Lin, Jung-Fu (2005) The spin state of iron in minerals of Earth's lower mantle. Geophysical Research Letters, 32 (12). Art. Mo. L12307. ISSN 0094-8276. doi:10.1029/2005GL022802.

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The spin state of Fe(II) and Fe(III) at temperatures and pressures typical for the Earth's lower mantle is discussed. We predict an extended high-spin to low-spin crossover region along the geotherm for Fe-dilute systems depending on crystal-field splitting, pairing energy, and cooperative interactions. In particular, spin transitions in ferromagnesium silicate perovskite and ferropericlase, the dominant lower mantle components, should occur in a wide temperature-pressure range. We also derive a gradual volume change associated with such transitions in the lower mantle. The gradual density changes and the wide spin crossover regions seem incompatible with lower mantle stratification resulting from a spin transition.

Item Type:Article
Related URLs:
Sturhahn, Wolfgang0000-0002-9606-4740
Jackson, Jennifer M.0000-0002-8256-6336
Additional Information:© 2005 by the American Geophysical Union. Article first published online: 23 Jun. 2005. This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Contract No. W-31-109-Eng-38. JMJ acknowledges support from NSF EAR-0135642.
Group:Seismological Laboratory
Funding AgencyGrant Number
Department of Energy (DOE) Office of Science, Basic Energy SciencesW-31-109-Eng-38
Issue or Number:12
Record Number:CaltechAUTHORS:20130211-114101666
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Official Citation:Sturhahn, W., J. M. Jackson, and J.-F. Lin (2005), The spin state of iron in minerals of Earth’s lower mantle, Geophys. Res. Lett., 32, L12307, doi:10.1029/ 2005GL022802
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36844
Deposited By: Tony Diaz
Deposited On:25 Feb 2013 23:06
Last Modified:09 Nov 2021 23:25

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