Effect of anomalous compressibility on Fe diffusion in ferropericlase throughout the spin crossover in the lower mantle
The transport of iron in the deep earth is important for understanding chemical equilibration between deep earth phases and between the core and mantle. However, iron transport modeling is complicated by its changes in spin state with pressure and temperature. Recent studies (Saha et al., 2011; Amma...
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| Published in | Earth and planetary science letters Vol. 362; pp. 1 - 5 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
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Elsevier B.V
15.01.2013
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| Abstract | The transport of iron in the deep earth is important for understanding chemical equilibration between deep earth phases and between the core and mantle. However, iron transport modeling is complicated by its changes in spin state with pressure and temperature. Recent studies (Saha et al., 2011; Ammann et al., 2011) calculated the diffusivity of iron in ferropericlase as a function of iron's spin state but did not include the coupling of iron migration energetics to the observed anomalous bulk modulus softening associated with the spin transition (Wentzcovitch et al., 2009; Crowhurst et al., 2008). Here we calculate the diffusivity of iron in ferropericlase throughout the lower mantle using a model for both iron's spin and the anomalous bulk modulus softening to provide a complete model of iron diffusion in ferropericlase. Including the bulk modulus softening increases iron diffusivities by a factor of thirty relative to values without this effect at some depths on the geotherm.
► A complete model of Fe diffusion in the lower mantle ferropericlase is presented. ► The model includes effects of Fe's spin and the associated anomalous compressibility. ► Anomalous compressibility: a cooperative effect for significant Fe concentration. ► Anomalous compressibility increases Fe diffusion in ferropericlase significantly. |
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| AbstractList | The transport of iron in the deep earth is important for understanding chemical equilibration between deep earth phases and between the core and mantle. However, iron transport modeling is complicated by its changes in spin state with pressure and temperature. Recent studies (Saha et al., 2011; Ammann et al., 2011) calculated the diffusivity of iron in ferropericlase as a function of iron's spin state but did not include the coupling of iron migration energetics to the observed anomalous bulk modulus softening associated with the spin transition (Wentzcovitch et al., 2009; Crowhurst et al., 2008). Here we calculate the diffusivity of iron in ferropericlase throughout the lower mantle using a model for both iron's spin and the anomalous bulk modulus softening to provide a complete model of iron diffusion in ferropericlase. Including the bulk modulus softening increases iron diffusivities by a factor of thirty relative to values without this effect at some depths on the geotherm. The transport of iron in the deep earth is important for understanding chemical equilibration between deep earth phases and between the core and mantle. However, iron transport modeling is complicated by its changes in spin state with pressure and temperature. Recent studies (Saha et al., 2011; Ammann et al., 2011) calculated the diffusivity of iron in ferropericlase as a function of iron's spin state but did not include the coupling of iron migration energetics to the observed anomalous bulk modulus softening associated with the spin transition (Wentzcovitch et al., 2009; Crowhurst et al., 2008). Here we calculate the diffusivity of iron in ferropericlase throughout the lower mantle using a model for both iron's spin and the anomalous bulk modulus softening to provide a complete model of iron diffusion in ferropericlase. Including the bulk modulus softening increases iron diffusivities by a factor of thirty relative to values without this effect at some depths on the geotherm. ► A complete model of Fe diffusion in the lower mantle ferropericlase is presented. ► The model includes effects of Fe's spin and the associated anomalous compressibility. ► Anomalous compressibility: a cooperative effect for significant Fe concentration. ► Anomalous compressibility increases Fe diffusion in ferropericlase significantly. |
| Author | Bengtson, Amelia Morgan, Dane Saha, Saumitra |
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| CitedBy_id | crossref_primary_10_1029_2018GL077982 crossref_primary_10_1016_j_epsl_2015_03_013 crossref_primary_10_1146_annurev_earth_042711_105304 crossref_primary_10_1103_PhysRevB_90_195205 crossref_primary_10_1021_acsearthspacechem_2c00014 crossref_primary_10_1029_2021JB023832 crossref_primary_10_1002_rog_20010 crossref_primary_10_1016_j_gsf_2018_10_003 |
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| SubjectTerms | anomalous compressibility Bulk modulus Diffusion Diffusivity Earth Fe diffusion Iron lower mantle Mantle Mathematical models Softening spin transition |
| Title | Effect of anomalous compressibility on Fe diffusion in ferropericlase throughout the spin crossover in the lower mantle |
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