Abstract
Abstract Chemical data for major and trace elements are presented for 54 samples from surface sediments of the Niger Delta. Over most of the delta, intense leaching leaves a product soil essentially in the system SiO 2 -Al 2 O 3 -H 2 O (−Fe 2 O 3 ) and severe depletion in the major oxides MgO, CaO, K 2 O and Na 2 O. Except in the smectite-rich eastern and coastal areas of the delta, the major minerals of the soils are quartz, kaolinite, gibbsite and goethite. The chemistry of these sediments is interpreted as consequences of severe leaching, rapid rate of infiltration, clay mineralogy, permeability and marine, non-marine water influence. Factor analysis on the bulk chemical data confirms this severe depletion and identifies trace element concentration mainly in the clay or the non-soluble refractory minerals.
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