Computer Science
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..57..278h&link_type=abstract
Earth and Planetary Science Letters, Volume 57, Issue 2, p. 278-284.
Computer Science
9
Scientific paper
The reliability of uranium-series age determinations of marine phosphorites has been tested by simultaneous determination of 230Th/234Pa/235U. The measured 230Th/234U activity ratios in representative phosphorite samples from the continental margins of Eastern Australia and Peru are consistent with the theoretically expected development with time of these isotope ratios on a concordia diagram and hence support the assumption that the initial 230Th and 231Pa contents are insignificant in comparison with the uranium contents, and that the phosphorites have remained a chemically closed system with respect to uranium, thorium and protactinium. Alpha-recoil-induced leakage of 234U from the phosphorites appears to be too slow to cause any serious errors in the 230Th ages, and hence can be neglected. These results demonstrate that reliable uranium-series age determinations can be obtained for marine phosphorites on the basis of a simple, closed system model.
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