ON THE GEOCHEMISTRY OF FE MN NODULES FROM SOUTH-ATLANTIC/

Analytic methods have been used to study the chemical compositions of Fe/Mn nodules (FMN) and ore crusts taken at the bottom of Brazil and K apskaya hollows. Nodules from the first region are characterized by th e changeable composition whereas nodules from the second - by the comp aratively stable one. The following elements: Ni, Cu, Zn, Mo, Cd are c orrelated wits Mn in the ore substance, but Co, Pb, and V - with Fe. C rusts are enriched in Fe, Ti, Ca, P, Co, Pb, V, and Sr as compared to nodules from the same location. Compared to the average chemical compo sition of oceanic FMN the studied ones are enriched in Fe, Ti, P, Li, Cr, As, Cs, Th, REE, but depleted by Cu, Zn, Ba, Ga, Y, Zr, Nb, Ta, W, Tl, Bi, Pt, Pd with adequate contents of Mn, Si, Al, Ca, Mg, Mo, Be, Se, V, Rb, Sr. Composition of the nodules is influenced by increased i ron content caused by the local features of sedimentation process.