Calibration of the C-14 timescale over the past 30,000 years using mass spectrometric U-Th ages from Barbados corals

Details Calibration of the C-14 timescale over the past 30,000 years using mass spectrometric U-Th ages from Barbados corals Calibration of the C-14 timescale over the past 30,000 years using mass spectrometric U-Th ages from Barbados corals

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.345..405b&link_type=abstract

Nature (ISSN 0028-0836), vol. 345, May 31, 1990, p. 405-410. Research supported by NSF and NASA.

Mathematics

Logic

362

Carbon 14, Dendrochronology, Mass Spectroscopy, Radioactive Age Determination, Abundance, Barbados, Calibrating, Coral Reefs, Thorium, Uranium

Scientific paper

Uranium-thorium ages obtained by mass spectrometry from corals raised off the island of Barbados confirm the high precision of this technique over at least the past 30,000 years. Comparison of the U-Th ages with C-14 ages obtained on the Holocene samples shows that the U-Th ages are accurate, because they accord with the dendrochronological calibration. Before 9,000 yr BP, the C-14 ages are systematically younger than the U-Th ages, with a maximum difference of about 3500 yr at about 20,000 yr BP. The U-Th technique thus provides a way of calibrating the radiocarbon timescale beyond the range of dendrochronological calibration.

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