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Minerals and Origin of the Moon

Minerals and Origin of the Moon. Triana Henz. Formation Theories. Fission Capture Co-formation Giant Impact. Data. High angular momentum Low iron core Identical abundances of oxygen isotopes. Giant Impact Exchange. Giant Impact Uncertainty. Faster cooling rate

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Minerals and Origin of the Moon

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  1. Minerals and Origin of the Moon Triana Henz

  2. Formation Theories • Fission • Capture • Co-formation • Giant Impact

  3. Data • High angular momentum • Low iron core • Identical abundances of oxygen isotopes

  4. Giant Impact Exchange

  5. Giant Impact Uncertainty • Faster cooling rate • Rotation of disk might have inhibited radial diffusion • Either enrich or same as the Earth in REE, thorium, uranium, zirconium and FeO

  6. Thick crust has feldspar and pyroxene Feldspar is mainly anorthite (CaAl2Si2O8 ) , especially if the melt is pyroxene and olivine rich Low density means that it most likely doesn’t have an iron core Same density as ordinary rock Mineral Make up

  7. Phenomenon • Pristine highland rocks are extremely rare • Probably due to “gardening” of the surface • Highland is made from molten lunar material that crystallized slowly from deep inside • Magma ocean froze over • Radioactive isotopes decayed, warming up interior • Basalt erupted to low areas

  8. Olivine: dense, in interiors and lava Pyroxene: constituent in interiors where metallic iron is present Feldspar: less dense, crust Ilmenite: lava, titanium bearing Composition

  9. Eutectic composition can shift with pressure Determine depth of lava source Composition

  10. REE fit in where they can Feldspars rejects lighter REE Feldspars accepts denser REE Pyroxene is opposite Olivine rejects all Europium (Eu) is a characteristic of feldspars Composition

  11. References • Taylor, G. J. (2008). "Compositional Balancing Before Moon Formation." Planetary Science Research Discoveries. http://www.psrd.hawaii.edu/Feb08/EarthMoonFormation.html

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