Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1046120 | Quaternary Research | 2006 | 10 Pages |
Abstract
Field observations, grain-size distribution, and cosmogenic nuclide data suggest that over time, boulders weather into grus and the bar sediments diffuse into the adjacent swales. As fans grow older the relief between bars and swales decreases, the sediment transport rate from bars to swales decreases, and the surface processes that erode the fan become uniform over the entire fan surface. The nuclide data therefore suggest that, over time, the difference in 10Be concentration between bars and swales increases to a maximum until the topographic relief between bars and swales is minimized, resulting in a common surface lowering rate and common 10Be concentrations across the fan. During this phase, the entire fan is lowered homogeneously at a rate of 10-15 mm kyrâ1.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geology
Authors
Ari Matmon, Kyle Nichols, Robert Finkel,