Apatite 4He/3He and (U-Th)/He Evidence for an Ancient Grand Canyon

@article{Flowers2012Apatite4A,
  title={Apatite 4He/3He and (U-Th)/He Evidence for an Ancient Grand Canyon},
  author={Rebecca M. Flowers and Kenneth A. Farley},
  journal={Science},
  year={2012},
  volume={338},
  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”
TLDR
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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The Cenozoic history of crustal deformation, surface uplift, and erosion of the central Colorado Plateau (southwestern USA) is distinct from and relatively poorly understood compared with surrounding
A stress-rifting origin of Grand Canyon
The Grand Canyon is a massive rift in the Colorado Plateau. How and when it developed has been debated for nearly 150 years. Most geologists believe the unusual landscape was primarily shaped by
U–Pb Dating of Cave Spar: A New Shallow Crust Landscape Evolution Tool
In carbonate terranes, rocks types that provide apatite are not available to effectively use apatite fission track (AFT) or (U/Th)‐He chronometry (AHe). Here we suggest that calcite cave spar can be
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TLDR
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