Dating recent peat deposits
To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies.If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies.Until the uncertainty associated with each of these dating approaches is clarified, we recommend employing multiple techniques to allow for corroboration between different methods.Pb dating provides a valuable, widely used means of establishing recent chronologies for sediments and other accumulating natural deposits.Allowing a website to create a cookie does not give that or any other site access to the rest of your computer, and only the site that created the cookie can read it.Dating recent peat deposits (i.e., past } 300 yrs of peat accumulation) has emerged as an important yet challenging task for estimating rates of organic matter accumulation and atmospheric pollutant deposition in peatlands.A number of the age estimates were older than expected and some of the oldest ages occurred in the upper parts of the sequence, which had been dated to the late 19th and early 20th century using other techniques.
The origin and magnitude of this effect are considered below, firstly for an idealised, theoretical Pb dating provides a valuable means of establishing peat and sediment chronologies.
We attempted to use wiggle-matched radiocarbon ages to date 2 peat profiles from northern England which have high-resolution records of paleomoisture variability over the last ∼300 yr.
A total of 65 C accelerator mass spectrometry (AMS) measurements were made on 33 macrofossil samples.
We include both continuous dating methods (i.e., methods based on Pb, constant bulk density, acidinsoluble ash, moss increment, pollen density) and chrono-stratigraphic markers (i.e., fallout isotopes from the Chernobyl accident and nuclear weapons testing, pollen stratigraphies, isothermal remanence magnetism, charcoal particles, spherical carbonaceous particles, PAHs, PCBs, DDT, toxaphene) that can be measured in peat and correlated temporally with known historical events.
We also describe the relatively new radiocarbon application of wiggle matching and use hypothetical data to highlight the potential of this developing technique for dating recent peat.