Abstract:
The study of the sedimentology and engineering properties of rocks in Omor and its environ in
Ayamelum Local Government Area of Anambra State was carried out. The study aimed at
determining the textural characteristic, depositional environment of the sediments and evaluating
the engineering suitability of the rocks found in the study area. The methods of study included
detailed field mapping and laboratory analysis. A total of nine (9) rock samples were collected
for analysis, and were analysed using the particle distribution test, pebble morphometry test and
Atterberg limits test. The field mapping showed the presence of two lithological unit -sandstone
and shale-. Results obtained from textural analysis for the sedimentological interpretation
showed that the sand samples are medium grained and are moderately sorted ? (0.38 to 1.0)
while the skewness and kurtosis ranges from very negatively skewed to nearly symmetrical, and
leptokurtic to very platykurtic. The result of linear discriminant function showed littoral
processes and a shallow agitated marine environment of deposition. The geotechnical analysis
showed that coefficient of uniformity and coefficient of curvature values showed a well graded
sand which is good for engineering purposes. The result of plasticity test on shale indicated
medium plasticity (liquid limit = 67%, plastic limit = 44% and 46%), hence, considered useful
for filling in engineering works. Results of pebble morphometry analysis showed a transitional
environment of deposition. It was concluded that continuous monitoring is needed to prevent
environmental hazards. |
