Cosmogenic 10Be as a potential dating tool in peat.
Because ombrotrophic peat bogs receive inputs of water, nutrients, pollutants, and xerobiotic materials solely from the atmosphere, and accumulate organic matter vertically, dated peat cores can provide a historical record of deposition. We propose a novel method for accurately determining dates of peat, based on cosmogenic 10Be. In a laboratory study, we document limited post-depositional mobility of atmospherically-deposited Be, a requisite for 10Be dating. We provide an example of how the 210Pb-dated upper portion of a peat core can be used to back-calculate a site-specific 10Be deposition rate, which can then be used to estimate dates for peat throughout a core, and also discuss limitations to the application of cosmogenic 10Be to the dating of peat deposits.
|Main Author:||Wieder, R Kelman.|
|Other Authors:||Vile, Melanie., Scott, Kimberli.|