Iron spin transition in Earth's mantle

S. Speziale*, A. Milner, V. E. Lee, S. M. Clark, M. P. Pasternak, R. Jeanloz

*Corresponding author for this work

Research output: Contribution to journalArticle

156 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)17918-17922
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume102
Issue number50
DOIs
Publication statusPublished - 13 Dec 2005
Externally publishedYes

Fingerprint Dive into the research topics of 'Iron spin transition in Earth's mantle'. Together they form a unique fingerprint.

  • Cite this