Evaluation of the Spatial Distribution of Grain Size Characteristics and its Role in Determining the Environment of Deposition of sediments in Orlu and Environs, Imo State South Eastern Nigeria
The depositional environments of sediments around Orlu and environs, Imo state, was studied using various statistical parameters including Mean size, Standard deviation, Skewness, and Kurtosis. These parameters were obtained from sieve analysis of fifteen (15) sediment samples obtained within the area of the study at different depth. The grain size distribution curves for the study area showed that about 80% by weight of the sediments are medium to coarse-grained sand and fine gravels, while the remaining 18% and 2% are fine-grained sand and coarse silt. The sorting indicates that the samples are very poorly sorted around Afor-nta and Isiekenesi areas, and are moderately sorted at Ihioma, and others area within the study. Other textural analysis also shows that the samples ranges from strongly fine skewed, very platykurtic to extreme leptokurtic and are uniformly graded, except in Afor-nta and Isiekenesi with wellgraded sediments. Analysis of the environment of deposition for the study area showed that the samples were deposited in beach/shallow agitated and fluvial agitated environments. Marine influence on the sediments seem to be dominant in the southern parts of the study area while fluvial influence is evident in the northern part of the area.
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