Late Miocene rejuvenation of central Idaho landscape evolution: A case for surface processes driven by plume-lithosphere interaction
- Larimer, Jeff E.
- Yanites, Brian John
- Phillips, William
- Mittelstaedt, Eric
DOIAbstract
We utilized field measurements of erosion rates and topographic analyses to constrain the timing and magnitude of landscape rejuvenation on the western flank of the Rocky Mountains in central Idaho, United States. Deeply incised canyons of the Clearwater, Salmon, and Snake Rivers dissect a broad region of roughly 8 × 10$^4$ km$^2$. Along the Salmon River, an observable break in slope separates relict landscapes of low relief (<400 m valley depth) from high-relief landscapes (1200–1600 m valley depth) adjusting to base-level forcing. The $^{10}$Be cosmogenic radionuclide concentrations in river sediment record basinwide erosion rates that increase from 0.05 mm/yr ± 0.008 in the low-relief topography to 0.12 mm/yr ± 0.016 in the adjusting, hi...
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