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CIDER experience

CIDER experience. Attended 2004 lecture and tutorial session Very useful for my education Post-perovskite (ppv) fever Changed thesis to “Geophysics and Geochemistry of Iron in the Core-Mantle Boundary and Core”

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CIDER experience

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  1. CIDER experience • Attended 2004 lecture and tutorial session • Very useful for my education • Post-perovskite (ppv) fever • Changed thesis to “Geophysics and Geochemistry of Iron in the Core-Mantle Boundary and Core” • More recently have been using on-line lectures as a resource for class I co-taught this winter on Earth Structure • Still working on ppv…

  2. Implications of the Fe-rich ppv at CMB • Possible explanation for ULVZ • Multiple ppv structures due to compositional differences, analogous to multiple pyroxene structures in the crust • Different Fe/Mg partitioning from Fe-poor ppv

  3. Implications of the Fe-rich ppv at CMB • Possible explanation for ULVZ • Multiple ppv structures due to compositional differences, analogous to multiple pyroxene structures in the crust • Different Fe/Mg partitioning from Fe-poor ppv

  4. Fe in ULVZ • Fe-rich ppv has low enough Vs to explain the depression of velocity in ULVZ

  5. Implications of the Fe-rich ppv at CMB • Possible explanation for ULVZ • Multiple ppv structures due to compositional differences, analogous to multiple pyroxene structures in the crust • Different Fe/Mg partitioning from Fe-poor ppv

  6. Structure of Fe-rich ppv differs from Fe-poor ppv Fe0.4Mg0.6SiO3 Pmma Cmcm Cmcm fits the data but not as well as Pmma

  7. Two different Fe sites in Fe-rich ppv x . z y • Pmma • M1 = Fe0.25 Mg0.75, (30% of Fe) • M2 = Fe0.55 Mg0.45, (70% of Fe)

  8. Intermediate spin? Lin et al, Nature Geoscience 2008 SMS shows two predominant sites, consistent with the XRD results?

  9. Implications of the Fe-rich ppv at CMB • Possible explanation for ULVZ • Multiple ppv structures due to compositional differences, analogous to multiple pyroxene structures in the crust • Different Fe/Mg partitioning from Fe-poor ppv

  10. Fe-Mg partitioning From Auzende et al, EPSL 2008 • Reaction between ppv, mw, and Fe. Core undersaturated in Si and O? Iron-depletion at base of mantle? Knittle and Jeanloz, Science 1991, Takafujiet al, GRL 2005, Sakai et al, GRL 2006, Asaharaet al, EPSL 2007, Ozawa et al, GRL 2008 • Does partitioning depend on Fe content?

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