Chemical analyses of Fe-Mn nodules from the Indian Ocean

Ten manganese nodules from the Northeast Pacific Ocean have been sampled from box cores retrieved during R/V Valdivia campaign V13/1. Cross-sections for each of the nodules have been investigated on typical growth zones: OL (old laminated), OD (old dentritic), YL (young laminated) and YD (young dentritic). The nodules were dried at 100°C anf after cutting, samples of growth zones were taken by boring. The samples were then dissolved in 1:1 HCL and atomic absorption spectrophotometric analysis were peformed on the dried residuals.