Abstract
Metal accumulation rates at a number of stations on the East Pacific Rise fracture zone at 9°S are determined and their areal variations are examined. The accumulation rates of Mn, Fe, Cu, Zn and Ni show their highest values at the Rise crest—fracture zone intersection with zones of lower accumulation rates around this site. There is a negative correlation between the sedimentation rates and the concentrations of Mn, Fe, Cu, Zn and Ni which results from the dissolution of CaCO 3 in the deeper areas. The areal variations of the Al and Ca accumulation rates differ from those of the above metals. The Al accumulation rate is strongly influenced by the presence of volcanic ash. The areas with high Mn, Fe, Cu, Zn and Ni accumulation rates are characterized by low Al and Ca accumulation rates.
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