RADIOTRACER UPTAKE ON THE SEA-FLOOR - RESULTS FROM THE MANOP CHAMBER DEPLOYMENTS IN THE EASTERN PACIFIC
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Results and interpretations of the first radioisotope uptake experiments carried out in a chamber of the MANOP (Manganese Nodule Program) Bottom Lander in the eastern tropical Pacific are described. Removal rates and mass balances after 4 days were obtained. The penetration of the tracers into the surface sediment was enhanced by particle mixing. Tracers were transferred down faunal tubes to a depth of 4 to 5 cm during a 4-day deployment at one site. At another site, particle mixing appears to have been responsible for radioisotopic enrichement of four out of six subsurface ferromanganese nodules, which were buried from 0.5 to 2 cm. 54Mn inventories of nodules at the second site were only half of those of adjacent sediments, similar to the ratio of the Mn accumulation rate in nodules to the Mn accumulation rate in sediments at the site. 1984.