Nature of the Earth's earliest crust from hafnium isotopes in single detrital zircons

@article{Amelin1999NatureOT,
  title={Nature of the Earth's earliest crust from hafnium isotopes in single detrital zircons},
  author={Yuri Amelin and Der-Chuen Lee and Alexander N. Halliday and R. T. Pidgeon},
  journal={Nature},
  year={1999},
  volume={399},
  pages={252-255}
}
Continental crust forms from, and thus chemically depletes, the Earth's mantle. Evidence that the Earth's mantle was already chemically depleted by melting before the formation of today's oldest surviving crust has been presented in the form of Sm–Nd isotope studies of 3.8–4.0 billion years old rocks from Greenland and Canada. But this interpretation has been questioned because of the possibility that subsequent perturbations may have re-equilibrated the neodymium-isotope compositions of these… 
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