The age of the Neapolitan Yellow Tuff caldera-forming eruption (Campi Flegrei caldera – Italy) assessed by 40Ar/39Ar dating method

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INTCAL98 Radiocarbon Age Calibration, 24,000–0 cal BP

Minze Stuiver, Paula J. Reimer, Edouard Bard … (1998)

The focus of this paper is the conversion of radiocarbon ages to calibrated (cal) ages for the interval 24,000–0 cal BP (Before Present, 0 cal BP = AD 1950), based upon a sample set of dendrochronologically dated tree rings, uranium-thorium dated corals, and varve-counted marine sediment. The14C age–cal age information, produced by many laboratories, is converted to Δ14C profiles and calibration curves, for the atmosphere as well as the oceans. We discuss offsets in measuredl4C ages and the errors therein, regional14C age differences, tree–coral14C age comparisons and the time dependence of marine reservoir ages, and evaluate decadalvs. single-year14C results. Changes in oceanic deepwater circulation, especially for the 16,000–11,000 cal BP interval, are reflected in the Δ14C values of INTCAL98.

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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.