210Pb datering

Roughly fifty years ago, a small group of scientists from Belgium and the United States, trying to better constrain ice sheet accumulation rates, attempted to apply what was then know about environmental lead as a potential geochronometer. Thus Goldberg (1963) developed the first principles of the 210Pb dating method, which was soon followed by a paper by Crozaz et al. (1964), who examined ... The 210 Pb sediment dating is the most widely used method to determine recent (~100–150 years) chronologies and sediment accumulation rates in aquatic environments and has been used effectively for reconstruction of diverse environmental processes associated with global change. Owing to the relative accessibility of the 210 Pb methodology, many environmental chronologies have been produced ... 210 Pb, a radioactive isotope in the 238 U decay chain, is continuously produced by the decay of atmospheric 222 Rn gas. The 210 Pb is transported in precipitation to the Earth’s surface where it adsorbs onto silicate particles, some of which become lacustrine sediment. This 210 Pb decays because it is unsupported by 226 Ra via 222 Rn. Therefore in undisturbed sediment that has been ... Current 210Pb dating models do not use a proper statistical framework and thus provide poor estimates of errors. Here we develop a new model for 210Pb dating, where both ages and values of supported and unsupported 210Pb form part of the parameters. We apply our model to a case study from Canada as well as to some simulated examples. Pb-210 is a naturally occurring radionuclide of the 238 U radioactive decay chain and has a half-life (t 1/2) of 22.23 years (Fig. 1).In most environmental systems that have remained “closed” for more than about 120 years (five times the half-life of 210 Pb), 210 Pb is derived from its parent radionuclide, 226 Ra (t 1/2 = 1,600 years), that is present in the material will reach a state of ... Thus Goldberg (1963) developed the first principles of the 210Pb dating method, which was soon followed by a paper by Crozaz et al. (1964), who examined accumulation history of Antarctic snow ... The Pearl River is the second largest river in China in terms of discharge flow. It delivers an average annual volume of 3.26 × 10 11 m 3 of fresh water and 8.9 × 10 7 tons of sediment into the PRE (Chen et al., 2001).The catchment is located in a typical subtropical climate regime, with an annual average temperature and rainfall of 22 °C and 1690 mm, respectively (Callahan et al., 2004).

210Pb dating to investigate the historical variations and ...