Apatite 4He/3He and (U-Th)/He evidence for an ancient Grand Canyon.

  title={Apatite 4He/3He and (U-Th)/He evidence for an ancient Grand Canyon.},
  author={Rebecca M. Flowers and Kenneth A. Farley},
  volume={338 6114},
The Grand Canyon is one of the most dramatic features on Earth, yet when and why it was carved have been controversial topics for more than 150 years. Here, we present apatite (4)He/(3)He thermochronometry data from the Grand Canyon basement that tightly constrain the near-surface cooling history associated with canyon incision. (4)He/(3)He spectra for eastern Grand Canyon apatites of differing He date, radiation damage, and U-Th zonation yield a self-consistent cooling history that… CONTINUE READING
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