Radiocarbon dating of sediments by accelerator mass spectrometry

Details Radiocarbon dating of sediments by accelerator mass spectrometry Radiocarbon dating of sediments by accelerator mass spectrometry

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pepi...44...15f&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 44, Issue 1, p. 15-20.

Physics

3

Scientific paper

Accelerator mass spectrometry allows the measurement of the abundance of carbon isotopes in much smaller samples (1 mg of carbon in the form of graphite) than conventional methods of radiocarbon dating. The small sample requirement widens the potential for sediment dating. In this study, fractions of the sedimentary organic matter, for example, humic acid, lipid, macrofossils, were isolated and each fraction dated to yield a suite of dates for one sediment sample.
Owing to the complexity of most sedimentary environments, a conventional radiocarbon date reflects the input of sediment from different sources with different carbon reservoirs which may combine to alter the date of the event that is required, i.e., the date of sedimentation. An estimate of the date of sedimentation may be made by taking specific fractions of the sedimentary organic matter which can be characterized and dated, for example, the lipid fraction, which can be sub-divided for analysis to yield information on the relative input of terrestrial and aquatic organic matter. Results have been obtained for five peat samples, the dates of the more water soluble components of the sedimentary organic matter tending to be younger than the lipid samples.

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