Some textural characteristics and organic matter contents of recent sediments in the Bonny estuary, Niger delta
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Forty-eight bottom sediments samples collected from the Bonny estuary were analyzed for textural Characteristics and organic carbon content. The dominant lithologies are sand, sandy mud, mud, sandy clay and clay. Pattern of sediment distribution consists of mud, sandy mud and clay in the swallow marginal areas of the river channel and creeks, while the channel centers are predominantly fine to coarse sand with graphic mean size ranging from 0.74 to 2.71Ø. Inclusive standard deviation values ranged from 0.35 to 1.64Ø suggesting the poorly to very well sorted nature of these sediments. Skewness varied from fine skewed to strong coarse skewed with 52% of the samples negatively skewed. Graphic kurtosis ranged from 0.92 to1.95 [mesokurtic to very leptokurtic]. The organic matter content [OM] of the sediment is closely associated with silt/clay content and graphic mean size [Mz]. The muddy sediments [Mz: 3.25-4.50Ø] commonly found in the shallow marginal areas of the river channel contain very high levels of OM [12.0-27.4%]. The sandy sediments [Mz: 0.25-2.25Ø] in the channels contained lower levels of OM [0.4 – 11.0%].
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