The proto-Earth as a significant source of lunar material

@article{Zhang2012ThePA,
  title={The proto-Earth as a significant source of lunar material},
  author={J. Zhang and Nicolas Dauphas and Andrew M. Davis and Ingo Leya and A. V. Fedkin},
  journal={Nature Geoscience},
  year={2012},
  volume={5},
  pages={251-255}
}
Geochemical evidence continues to challenge giant impact models, which predict that the Moon formed from both proto-Earth and impactor material. Analyses of lunar samples reveal isotopic homogeneity in titanium, a highly refractory element, suggesting lunar material was derived predominantly from the mantle of the proto-Earth. 

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