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Title: Iron spin transition in Earth's mantle

Abstract

High-pressure Mössbauer spectroscopy on several compositions across the (Mg,Fe)O magnesiowüstite solid solution confirms that ferrous iron (Fe 2+) undergoes a high-spin to low-spin transition at pressures and for compositions relevant to the bulk of the Earth's mantle. High-resolution x-ray diffraction measurements document a volume change of 4–5% across the pressure-induced spin transition, which is thus expected to cause seismological anomalies in the lower mantle. The spin transition can lead to dissociation of Fe-bearing phases such as magnesiowüstite, and it reveals an unexpected richness in mineral properties and phase equilibria for the Earth's deep interior.

Authors:
; ; ; ; ;  [1];  [2];  [2]
  1. LBNL
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
DOE - BASIC ENERGY SCIENCESDOE - OTHERNSFUNIVERSITY
OSTI Identifier:
1169972
Resource Type:
Journal Article
Resource Relation:
Journal Name: Proc. Natl. Acad. Sci. USA; Journal Volume: 102; Journal Issue: (50) ; 12, 2005
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Speziale, S., Milner, A., Lee, V. E., Clark, S. M., Pasternak, M. P., Jeanloz, R., Tel Aviv), and UCB). Iron spin transition in Earth's mantle. United States: N. p., 2015. Web. doi:10.1073/pnas.0508919102.
Speziale, S., Milner, A., Lee, V. E., Clark, S. M., Pasternak, M. P., Jeanloz, R., Tel Aviv), & UCB). Iron spin transition in Earth's mantle. United States. doi:10.1073/pnas.0508919102.
Speziale, S., Milner, A., Lee, V. E., Clark, S. M., Pasternak, M. P., Jeanloz, R., Tel Aviv), and UCB). Fri . "Iron spin transition in Earth's mantle". United States. doi:10.1073/pnas.0508919102.
@article{osti_1169972,
title = {Iron spin transition in Earth's mantle},
author = {Speziale, S. and Milner, A. and Lee, V. E. and Clark, S. M. and Pasternak, M. P. and Jeanloz, R. and Tel Aviv) and UCB)},
abstractNote = {High-pressure Mössbauer spectroscopy on several compositions across the (Mg,Fe)O magnesiowüstite solid solution confirms that ferrous iron (Fe2+) undergoes a high-spin to low-spin transition at pressures and for compositions relevant to the bulk of the Earth's mantle. High-resolution x-ray diffraction measurements document a volume change of 4–5% across the pressure-induced spin transition, which is thus expected to cause seismological anomalies in the lower mantle. The spin transition can lead to dissociation of Fe-bearing phases such as magnesiowüstite, and it reveals an unexpected richness in mineral properties and phase equilibria for the Earth's deep interior.},
doi = {10.1073/pnas.0508919102},
journal = {Proc. Natl. Acad. Sci. USA},
number = (50) ; 12, 2005,
volume = 102,
place = {United States},
year = {Fri Feb 06 00:00:00 EST 2015},
month = {Fri Feb 06 00:00:00 EST 2015}
}