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Title: Iron spin transition in Earth's mantle

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