10Be accumulation in a soil chronosequence |
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| Authors: | Milan J Pavich Louis Brown Jeffrey Klein Roy Middleton |
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| Institution: | 1. U.S. Geological Survey, Reston, VA 22092 U.S.A.;2. Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015 U.S.A.;3. Tandem Accelerator Laboratory, University of Pennsylvania, Philadelphia, PA 19104 U.S.A. |
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| Abstract: | We have measured the concentration of the cosmogenic isotope10Be in soil samples from various horizons at six sites, including three independently dated Rappahannock River terraces and a previously undated Piedmont soil to which we have assigned an age. All of the incident10Be can be accounted for in one of these soils and a second is within a factor of two. In three soils, whose concentrations vary widely with depth, a significant fraction of the incident10Be cannot be accounted for. Incomplete sampling, and enhanced Be mobility caused by organic components, are the probable reasons for the low inventory of Be from these three soils. Overall, the data from these six sites indicate that10Be accumulation could be used to assign ages to soils if Be is not mobilized and lost from the soil profile. |
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