Strengthening potential of recent peat dating

Area of Science:

• Geochronology
• Environmental Science
• Radiochemistry

Background:

• Peatlands are crucial archives of environmental history.
• Accurate dating of peat deposits is essential for understanding past environmental changes.
• Traditional dating models can be challenged by complex peat profiles.

Purpose of the Study:

• To reconstruct high-resolution age models for Central European peatlands.
• To evaluate the performance of the Plum method and compare it with classical dating models.
• To assess the reliability of lead-210 (²¹⁰Pb) and other radioisotopes for peat dating.

Main Methods:

• High-resolution age reconstructions using ²¹⁰Pb as a primary geochronometer.
• Verification of dating using Carbon-14 (¹⁴C) and Plutonium-239+240 (²³⁹⁺²⁴⁰Pu) radioisotopes.
• Application of the Plum method alongside classical Constant Rate (CF) and Constant Source (CS) models.
• Analysis of ²¹⁰Pb activity concentration and bulk density variability in peat profiles.

Main Results:

• The Plum method, with minor corrections, yielded reliable and accurate chronologies for diverse peatland types.
• Age series from different ²¹⁰Pb models showed high consistency within individual peat cores.
• ²¹⁰Pb inventory and flux assessments indicated elevated radon-222 (²²²Rn) exhalation in the Sudetes region.
• No significant geographical patterns were observed in ²¹⁰Pb fluxes or accumulation rates.

Conclusions:

• The Plum method is a robust approach for high-resolution peat dating, even in complex profiles.
• ²¹⁰Pb dating, verified by ¹⁴C and ²³⁹⁺²⁴⁰Pu, provides accurate chronologies for Central European peatlands.
• Elevated ²²²Rn exhalation influences ²¹⁰Pb deposition in the Sudetes region, impacting flux assessments.