Abstract
Nine pelagic ferromanganese nodules from the South-Eastern Pacific have been analyzed by the alpha-radiography technique using the nitrate cellulose detector LR-115 (type 1). The obtained distributions of the total alpha-radioactivity characterize the growth processes in the recent time. The surface rinds of the nodules accumulated at 1–16 mm/Ma, a value which is in the normal range for deep-sea nodules from this region. Some nodules have been analyzed along two different radial directions which have rather different rates of accretion.
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