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- W236277474 abstract "Recent development of techniques for measuring and interpreting concentrations of radioactive and stable isotopes produced in situ by cosmic-ray bombardment of rock materials exposed at the earth's surface may enable one to estimate long-term erosion rates directly. Because much of a landscape's history is contained within soils and regolith, it would be advantageous to attempt to apply these techniques directly to those portions of the landscape, as well as to cobbles, boulders, or bedrock where appropriate. The authors believe that although these rates would likely be subject to some error, they would be preferable for analyses of landform evolution to estimates based primarily on short-term sediment yields. As a first step in applying these techniques to terrestrial sediments, they present preliminary analytical results of in situ-produced cosmogenic C-14 extracted from pebbles and coarse sands collected from three trenches at the Walnut Gulch Experimental Watershed, southern Arizona. The trenches were dug in interfluve, mid-slope and footslope environments, respectively, and sampled at depths ranging from the ground surface to approximately 3 m. Because a sedimentary deposit is usually derived from bedrock or sediment which has been exposed at the earth's surface for some generally undetermined time period, the inherited component of themore » in situ cosmogenic isotope concentration in soils is perhaps the largest source of error in this method. In situ-produced Be-10 and Al-26 have been used most frequently to study bedrock erosion rates; however, it is advantageous to use a relatively short half-life isotope such as C-14 in sediments. To evaluate the effectiveness of the technique in eliminating a detectable inherited C-14 component, the depth distribution of in situ-produced C-14 is compared to the theoretical exponential attenuation of in situ C-14 production with depth. Results are compared between the three sampled environments.« less" @default.
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- W236277474 date "1992-01-01" @default.
- W236277474 modified "2023-09-23" @default.
- W236277474 title "Depth distribution of in situ-produced cosmogenic [sup 14]C in sediments from the Walnut Gulch Experimental Watershed, southern Arizona" @default.
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