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Lookup NU author(s): Professor Takeshi Nakagawa
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Lake Suigetsu, Honshu Island, Japan provides an ideal sedimentary sequence from which to derive a wholly terrestrial radiocarbon calibration curve back to the limits of radiocarbon detection (circa 60 ka bp). The presence of well-defined, annually-deposited laminae (varves) throughout the entirety of this period provides an independent, high resolution chronometer against which radiocarbon measurements of plant macrofossils from the sediment column can be directly related. However, data from the initial Lake Suigetsu project [1-3] were found to diverge significantly from alternative, marine-based calibration datasets released around the same time (e.g. [4,5]). The main source of this divergence is thought to be the result of inaccuracies in the absolute age profile of the Suigetsu project, caused by both varve counting uncertainties and gaps in the sediment column of unknown duration between successively-drilled core sections. Here, a re-analysis of the previously-published Lake Suigetsu data is conducted. The most recent developments in Bayesian statistical modelling techniques (OxCal v4.1; [6]) are implemented to fit the Suigetsu data to the latest radiocarbon calibration datasets and thereby estimate the duration of the inter-core section gaps in the Suigetsu data. In this way, the absolute age of the Lake Suigetsu sediment profile is more accurately defined, providing significant information for both radiocarbon calibration and palaeoenvironmental reconstruction purposes. © 2009 Elsevier B.V. All rights reserved.
Author(s): Staff R, Bronk Ramsey C, Nakagawa T
Publication type: Article
Publication status: Published
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Year: 2010
Volume: 268
Issue: 7-8
Pages: 960-965
ISSN (print): 0168-583X
ISSN (electronic): 1872-9584
Publisher: Elsevier BV
URL: http://dx.doi.org/10.1016/j.nimb.2009.10.074
DOI: 10.1016/j.nimb.2009.10.074
Notes: Proceedings of the Eleventh International Conference on Accelerator Mass Spectrometry
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