Other
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..33..208b&link_type=abstract
Earth and Planetary Science Letters, Volume 33, Issue 2, p. 208-218.
Other
4
Scientific paper
Growth rates of four Pacific ferromanganese deposits have been determined by uranium-series and hydration-rind dating techniques. This represents the first time these two methods have been applied to the same samples. Of the four samples analyzed, two agree in both techniques and two show a wide disparity. The samples that do not agree have uranium-series rates which are low compared to those deduced by the hydration-rind techniques. The same samples also display steep 232Th activity gradients in the outer layers of the ferromanganese material. Since the half-life of 232Th is extremely long (1010 yr), these gradients could not be due to radioactive decay. This suggests that the distribution of 230Th, at least in these cases, may also be a result of some process other than radioactive decay. One of our samples which has a steep 232Th gradient produces a 230Th ``exposure age'' which is indistinguishable to the calculated hydration age within the analytical uncertainty. The rate of growth calculated on the basis of the slope of the decline of 230Th within the deposit, however, is low by over one order of magnitude when compared to the rate determined by the hydration-rind method. Although previous results indicate that the distribution of 232Th is usually quite random within ferromanganese deposits, our results indicate that caution should be exercised when assessing their growth rates on the basis of uranium-series results. Present address: Hawaii Marine Research, Inc., 45-267 Kokokali Place, Kaneohe, Hawaii 96744.
Burnett William C.
Morgenstein Maury
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