X-ray microprobe analysis of manganese nodules from the vicinity of MANOP Site S in the north equatorial Pacific Ocean

Manganese nodules were taken from free-fall grabs at various stations of the Manganese Nodule Program BOMDROP cruise MN75-03. The underlaying sediment was essentially a siliceous ooze overlaying induretaed carbonate formations. Polished sections of manganese nodules have been investigated using X-ray microprobe analysis by the author at Sandia National Laboratories, USA. Various local zones of the cross-sections have been investigated including outside surface, local protruding botryoids, inside layers and todorokite rich cores. The table presents the average chemical measurements along each of the examination profiles scanned with the microprobe.