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- W2053648318 abstract "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 232 Th activity gradients in the outer layers of the ferromanganese material. Since the half-life of 232 Th is extremely long (10 10 yr), these gradients could not be due to radioactive decay. This suggests that the distribution of 230 Th, 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 232 Th gradient produces a 230 Th “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 230 Th 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 232 Th 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." @default.
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- W2053648318 date "1976-12-01" @default.
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- W2053648318 title "Growth rates of Pacific manganese nodules as deduced by uranium-series and hydration-rind dating techniques" @default.
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- W2053648318 doi "https://doi.org/10.1016/0012-821x(76)90227-2" @default.
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