Abstract
Sedimentological studies of samples from Famgbe River were carried out with aid of a mechanical sieve method. 10 loose sediment samples collected along the bank of Famgbe River were subjected to granulometric analysis to determine their textural characteristics and depositional processes. Standard sedimentological methods involving sieve analysis were utilized to determine the various size distribution of each sample. This was further subjected to statistical analysis (mean size, sorting, kurtosis, skeweness). Results show that the samples were very coarse to coarse grain in size (-0.77ϕ to 0.77ϕ), poorly to moderately sorted (0.53ϕ-1.48ϕ), nearly symmetrical to positively skewed (-0.01ϕ to 0.25ϕ) and very platykurtic to leptokurtic (0.14ϕ t0 1.4ϕ) with dominantly coarse grained. Most of the samples are moderately sorted, positively skewed and leptokurtic nature of sediments. This suggests that the sediments were transported by saltation and traction and being deposited during a high energy condition in a fluvial environment.
Highlights
Famgbe River is an extension of Nun River called Kolo creek which is within the central sector of the Niger Delta and lies between latitude 40 50N and longitude 605’-70E
The dominant moderately well sorted character infers that the transportation responsible for the deposition was very turbulent where there is a lot of winnowing (Shettima, et al, 2016)
The present work was carried out to study the nature of grain size distribution of sediments along the Famgbe axis of the River Nun
Summary
Famgbe River is an extension of Nun River called Kolo creek which is within the central sector of the Niger Delta and lies between latitude 40 50N and longitude 605’-70E It is located within the tropical continental margin of the Gulf of Guinea and sub-equatorial region of West Africa. The basin is divided into three major diachronous formations ranging from Eocene to recent base on environmental influence These environments are continental, paralic and marine environments which are represented by the Akata, Agbada and Benin formation(Table 2.0) respectively. This is a paralic delta front megafacies, which underlied the Benin formation It consist of an interbedded sequence of sand and shales about 3150m thick on the average. Clay and silt Coastal medium sand; subordinate silt and clay lenses Mixture of clay sand and silt Clay
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