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Last Layers of Terrestrial Magma Ocean Solidification

Last Layers of Terrestrial Magma Ocean Solidification. Magma ocean solidifies from the bottom up Last 0.3% of mantle not solidified by model Leftover “exotic” mix of oxides in melt CaO (50%), FeO (27%), Al 2 O 3 (20%), SiO 2 (3%), MgO (1%) Enriched in Nd, Sm, U, Th too!

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Last Layers of Terrestrial Magma Ocean Solidification

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  1. Last Layers of Terrestrial Magma Ocean Solidification • Magma ocean solidifies from the bottom up • Last 0.3% of mantle not solidified by model • Leftover “exotic” mix of oxides in melt • CaO (50%), FeO (27%), Al2O3 (20%), SiO2 (3%), MgO (1%) • Enriched in Nd, Sm, U, Th too! • What happens to the leftover material? A. Springmann, 12.470, May 14 2009

  2. Exotic Oxide Solidification • Create a melt with appropriate composition • Use multi-anvil press(Takahashi 1993) to conduct melting experiments • X-ray mapping to determine stable mineral phases of resulting solid compositions • Mass spectrometry to measure incompatible element concentrations

  3. Bigger Questions • What solidifies out of this melt? • Apatite, magnetite, crustal perovskite, post-perovskite, hematite, corundum, uranium oxides, or something else? • Densities? • Incompatible element enrichment? • D” layer implications • Match incompatible element predictions from Carlson & Boyet (2008)?

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