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Lecture 6: Evolution of the Infant Moon


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Lecture 6 of the course Our Moon: From Imagination to Exploration. In this lecture, I discuss how the Moon solidified over time having formed very hot after the giant impact.

Please see the presenter notes section for what I said about each slide in class.

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Lecture 6: Evolution of the Infant Moon

  1. 1. Our Moon Lecture 6 Evolution of the Infant Moon
  2. 2. Saturday, October 5th, 2019
  3. 3. Lunar Magma Ocean (LMO) Model Image: NASA
  4. 4. “Canonical” Giant Impact Model Simulation: R. Canup These models are typically done using a technique called Smoothed-Particle Hydrodynamics (SPH)
  5. 5. Math…
  6. 6. Sample 60015 Apollo 16 Images: NASA/JSC
  7. 7. Thermal Evolution of the Moon 104 yr 107 to 108 yr
  8. 8. Lunar Magma Ocean Crystallization Animation: Yi Zheng
  9. 9. From: Yamamoto et al. (2012) Identifying Anorthosite Using Remote Sensing Purest anorthosite Olivine-rich material
  10. 10. From: Taylor et al. (2006) Europium (Eu) Anomaly
  11. 11. Computer Modeling of Lunar Magma Ocean Crystallization
  12. 12. Potassium on the Moon Data: Lunar Prospector “Incompatible” Elements From: Elkins-Tanton et al. (2011) Initial Composition & Crystallization Sequence 0 25 50 75 100 A B C D E F G SiO2 MgO FeO Al2O3 CaO Percentage Baseline composition similar to Earth’s mantle No enhancement of refractory elements (Lunar Primitive Upper Mantle, Longhi, 2006) vs. With enhancement of refractory elements (Taylor Whole Moon, Taylor, 1982)
  13. 13. LMO Solidification
  14. 14. Early Timeline of the Moon Connelly et al. (2012) Moon formation 62 (+90/ -10) Myr after CAIs Touboul et al. (2009) LMO solidification ~30 Myr Perera et al. (2018) Alibert et al. (1994) Borg et al. (1999) Borg et al. (2015) Borg et al. (2015)
  15. 15. From: Shearer et al. (2015) Types of Lunar Anorthosites
  16. 16. From: Borg et al. (2017) Sample Ages
  17. 17. From: Crawford et al. (2014) Alternative Models