https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:21776 Sat 24 Mar 2018 08:00:39 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26051 230Th relative even to the very low levels of detrital ²³⁰Th present. Here, we present an alternative method for reliable dating of these young speleothems using radiocarbon. Approximately 100 carbonate samples from SC4 and WM7 were analysed for ¹⁴C by accelerator mass spectrometry (AMS). The AMS results indicate that bomb ¹⁴C was evident in the youngest parts of both stalagmites. Two different approaches were used to estimate dead carbon fraction (DCF) values for these stalagmites for the pre-bomb period. For SC4, the DCF values were estimated based on the timing of ¹⁴C dates for that period determined by high-resolution δ¹⁸O recorded in the speleothem, and the timing of the onset of bomb ¹⁴C. For WM7, a “maximum” range of pre-bomb DCF was determined. Chronologies of these speleothems were built based on a dense sequence of DCF-corrected ages using three different age-depth models: Clam (Classical method), and Bacon and OxCal (Bayesian statistical approach). Good agreement between these age-depth models were observed indicating that the top 170 mm of SC4 and the top 50 mm of WM7 grew during the past 550–750 years and 1360–1740 years, respectively.]]> Sat 24 Mar 2018 07:31:29 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:27483 Sat 24 Mar 2018 07:25:39 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47507 Mon 23 Jan 2023 12:08:45 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:18646 Mon 20 Jul 2015 16:52:21 AEST ]]>