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      Radiocarbon Calibration by Means of Mass Spectrometric 230Th/234U and 14C Ages of Corals: An Updated Database Including Samples from Barbados, Mururoa and Tahiti

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          Abstract

          As first shown by Bardet al.(1990a), high-precision230Th-234U ages can be used successfully to calibrate the radiocarbon time scale beyond the high-precision tree-ring calibration that now reaches 11,900 cal bp (Kromer and Spurk 1998). Using mass spectrometric techniques, we measured14C and230Th ages on new samples collected from boreholes drilled off the islands of Tahiti and Mururoa (French Polynesia) in order to complement the database previously obtained on Barbados corals (Bardet al.1990a, 1993).

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

          Edouard Bard, Bruno Hamelin, Richard Fairbanks … (1990)
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            Deglacial sea-level record from Tahiti corals and the timing of global meltwater discharge

            Edouard Bard, Bruno Hamelin, Maurice Arnold … (1996)
            Article 0 comments Cited 296 times – based on 0 reviews     Review now
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              230Th-234U and 14C Ages Obtained by Mass Spectrometry on Corals

              Edouard Bard, Maurice Arnold, Richard Fairbanks … (1993)
              In 1988, Fairbanks conducted a drilling expedition off the south coast of Barbados to recover submerged corals contemporaneous with the last deglaciation. Core recovery was excellent and >30 different samples were dated by conventional β-counting techniques (Fairbanks 1989). At about the same time, we developed, at Lamont, the thermal ionization mass spectrometry (TIMS) technique to obtain precise U-Th ages (Edwards 1988), and to compare them with the14C estimates measured on the same samples. A surprising result was that the discrepancy between14C and U-Th ages increased through time toca.3000–3500 yr atca.15,00014C BP (Bardet al.1990a). Because the three youngest samples yielded U-Th ages in agreement with their calibrated14C ages, we concluded initially that the TIMS U-Th determinations were not only precise, but also accurate, and that the14Cvs.U-Th data set could be used for a first-order14C calibration.
              Article 0 comments Cited 188 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (publisher-id): applab
                Title: Radiocarbon
                Abbreviated Title: Radiocarbon
                Publisher: Cambridge University Press (CUP)
                ISSN (Print): 0033-8222
                ISSN (Electronic): 1945-5755
                Publication date Created: 1998
                Publication date (Print): July 2016
                Volume: 40
                Issue: 03
                Pages: 1085-1092
                Article
                DOI: 10.1017/S0033822200019135
                SO-VID: 13432dde-9d02-4882-8402-2675d1e81198
                Copyright © © 1998
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