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Basal beds of black manganiferous sediment (early Paleocene) were recovered from the southwest Indian Ocean in the southern Madagascar Basin. Thirty samples were selected from the lowest 26 meters of core, representing about 3 X 10^ years of accumulation and spreading. Concentrations of Ca, Al, Si, Fe, Mn, K, Ti, Sr, Cu, and Zn were examined. These sediments are chemically similar to basal sediments in the Atlantic and Pacific oceans, as well as to those presently being deposited on the East Pacific Rise, but they have a noticeably lower metal content. Over the examined period of sediment deposition, iron and manganese accumulation rates decreased significantly. Interbedded ash layers have a distinctive chemical signature and are sometimes enriched with heavy metals. The ash layers have a much higher Ti/Al ratio than the surrounding sediment, which makes the origin of these ashes somewhat uncertain.

Iron-Rich Basal Sediments from the Indian Ocean: Site 245, Deep Sea Drilling Project