Physics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..37..251m&link_type=abstract
Earth and Planetary Science Letters, Volume 37, Issue 2, p. 251-256.
Physics
7
Scientific paper
A simple procedure for simultaneous Io and 231Pa dating of deep-sea sediments is described. The 231Pa content is determined from the specific activity of its grand-daughter 227Th. Fast thorium (and uranium) separation is carried out with a newly developed procedure using the ion-exchangers Aliquat-336 and TTA. The procedure was applied for Io and 231Pa dating of deep-sea cores Vema 18-258, Valdivia 10127 and Valdivia 10141 from the North and South Pacific. In the case of core Vema 18-258 our results confirm previous Io and 231Pa data of T.L. Ku. For the Valdivia core 10127 sedimentation rates of respectively 2.7 and 3.2 mm/1000 years were calculated from the decrease of the Io and 231Pa excess activities. For the Valdivia core 10141 different sedimentation rates in the core section above and below 18 cm were found (0-18 cm: 3.9 mm/1000 years (Io) and 5 mm/1000 years (231Pa); 18-37 cm: 20 mm/1000 years (Io and 231Pa)). These findings give proof that 227Th in the sediment is essentially in radioactive equilibrium with 231Pa. 231Pa dating via 227Th counting simultaneously to Io dating is suggested.
Mangini Augusto
Sonntag Christian
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