Spatial variation of U-Th series radionuclides and trace metals in deep-sea manganese encrustations

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Scientific paper

A series of measurements to assess the spatial variability on a scale of a few centimeters of U-Th series nuclides and trace metals in surface layers of deep-sea ferromanganese encrustations are reported here. Two samples, one from an Atlantic seamount and another from MANOP site S in the Pacific are reported.
The inventories of 230Thexc cm-2 and 231Paexc cm-2 as well as the ratios of the inventories are seen to vary by large amounts in samples only a few centimeters apart. These observations infer that the fluxes of these radionuclides to small areas on the ferromanganese crust may also vary with time. No strong correlation between the radioisotope inventories and concentrations of various elements has been observed.

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