『Abstract
We have measured erosion rates using 10Be from bare-bedrock
surfaces exposed at high elevations at Dolly Sods, West Virginia,
a classic Appalachian paleoperiglacial plateau. The mean erosion
rate from nine samples is 5.7 m/m.y., significantly lower than
previously estimated periglacial erosion rates in this region.
Measured bare-bedrock erosion rates likely represent the rate
at which the highest portions of this broad upland are being lowered.
Fluvial incision rates measured in the region over similar time
scales are ≧2 times faster, suggesting relief is increasing in
this portion of the Appalachians. This observation of increasing
relief is inconsistent with prior work suggesting that the central
Appalachian landscape is in dynamic equilibrium or currently decreasing
in relief. We hypothesize that late Cenozoic climate change has
accelerated fluvial incision rates, creating a disequilibrium
landscape with growing relief with hillslopes undergoing adjustment
to increased fluvial incision rates.
Keywords: erosion; relief; cosmogenic nuclides; landscape evolution;
Appalachians』
Introduction
Study area and sampling sites
Methods
Results and discussion
Acknowledgments
References cited