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Nature Geoscience 1, 648 - 650 (2008)
doi:10.1038/ngeo327
Subject Category: Volcanology, mineralogy and petrology
Mineral physics: The spin deep within
Stephen Stackhouse1
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Stephen Stackhouse is in the Department of Geological Sciences, University of Michigan, 2534 CC Little Bldg, 1100 North University Avenue, Ann Arbor, Michigan 48109-1005, USA.
e-mail: sstackho@umich.edu
Abstract
The electronic configuration of iron impurities in lower-mantle minerals influences their physical properties, but it is not well constrained. New studies suggest that ferrous iron in silicate phases exists mainly in an intermediate spin state.
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RESEARCH
Supplementary InformationNature Geoscience Letter (01 Oct 2008)
Supplementary InformationNature Geoscience Letter (01 Oct 2008)
The two main iron-bearing silicate phases in the mantle?ferroperovskite and ferropericlase?are expected to partition iron isotopes differently. Theoretical calculations suggest that the spin state of iron strongly influences the iron isotopic composition of ferropericlase, whereas the iron isotopic composition of ferroperovskite is almost independent of spin state. The two main iron-bearing silicate phases in the mantle?ferroperovskite and ferropericlase?are expected to partition iron isotopes differently. Theoretical calculations suggest that the spin state of iron strongly influences the iron isotopic composition of ferropericlase, whereas the iron isotopic composition of ferroperovskite is almost independent of spin state. Calculated (B3LYP) bond lengths, in picometres (10 Reduced partition function ratiosNature Geoscience Letter (01 Jul 2009)
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