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},
  pages={1616 - 1619}
A Grand Old Canyon In the southwestern United States, the Grand Canyon is a striking example of the power of erosion over time. Over millions of years, flowing river water carved out the canyon that today measures over 1.6 km deep and 29 km long. Most models posit that the majority of the canyon formed 5 to 6 million years ago. Using thermochronometry, Flowers and Farley (p. 1616, published online 29 November) examined the temperature-dependent diffusion of helium within mineral grains… 
Comment on “Apatite 4He/3He and (U-Th)/He Evidence for an Ancient Grand Canyon”
Cooling models and geologic data are most consistent with a 5 to 6 Ma age for western Grand Canyon and Marble Canyon, negating the proposed 70 Ma and 55 Ma paleocanyons.
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Age and Evolution of the Grand Canyon Revealed by U-Pb Dating of Water Table-Type Speleothems
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Dating topography of the Sierra Nevada, California, using apatite (U–Th)/He ages
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Accurate models for the incision of the Grand Canyon must include characterization of tectonic influences on incision dynamics such as active faulting and mantle to surface fluid interconnections.
The California River and its role in carving Grand Canyon
Recently published thermochronological and paleoelevation studies in the Grand Canyon region, combined with sedimentary provenance data in both the coastal and interior portions of the North American
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Incision of the Colorado River in the Grand Canyon, widely thought to have happened between ca. 6 and 1.2 Ma, has continued at variable rates along the canyon over the past ;500 k.y., based on
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