Sediment Accumulation Rates in an Alaskan Arctic Lake Using a Modified 210Pb Technique

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Abstract
Because of high concentrations of authigenic Mn and Fe oxides in surficial sediments from Toolik Lake, Alaska, the normalization of depth and 210Pb activity scales to the sediment Al content was used for sediment accumulation rate calculations. These results are compared with the conventional 210Pb dating technique. I found the flux of 210Pb to the lake to be very low (10 dpm∙cm−2∙yr−1), and excess 210Pb is restricted to the top 5 cm of sediment. The whole lake sediment accumulation rate is about 2.7 mg∙cm−2∙yr−1 and the sediments are little disturbed by physical or biological processes. Low rates of physical and chemical weathering are responsible for the low sediment accumulation rates.

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