230Th-234U and 14C Ages Obtained by Mass Spectrometry on Corals - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Radiocarbon Année : 1993

230Th-234U and 14C Ages Obtained by Mass Spectrometry on Corals

Résumé

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 the 14 C estimates measured on the same samples. A surprising result was that the discrepancy between 14 C and U-Th ages increased through time to ca. 3000–3500 yr at ca. 15,000 14 C BP (Bard et al. 1990a). Because the three youngest samples yielded U-Th ages in agreement with their calibrated 14 C ages, we concluded initially that the TIMS U-Th determinations were not only precise, but also accurate, and that the 14 C vs. U-Th data set could be used for a first-order 14 C calibration.

Dates et versions

hal-03584242 , version 1 (22-02-2022)

Identifiants

Citer

Edouard Bard, Maurice Arnold, Richard Fairbanks, Bruno Hamelin. 230Th-234U and 14C Ages Obtained by Mass Spectrometry on Corals. Radiocarbon, 1993, 35 (1), pp.191-199. ⟨10.1017/S0033822200013886⟩. ⟨hal-03584242⟩
29 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More