SEDIMENTARY TEXTURAL PARAMETERS OF OUTCROPS SAMPLE, EXPOSED ALONG A ROAD CUT IN CALABAR, CALABAR FLANK, SOUTHEASTERN NIGERIA
Journal Title: International Journal of Engineering Sciences & Research Technology - Year 30, Vol 5, Issue 10
Abstract
Grain size and pebble morphometry analysis was carried out on 10 outcrop samples and 100 unweathered quartz pebbles exposed along a Road cut in Calabar which is a part of Calabar Flank, Southeastern Nigeria, to interpret textural parameters and paleoenvironmental deposits. The statistical granulometeric parameters of Mean Size ,Inclusive Standard Deviation, Skewness and Kurtosis yielded verage values of 0.90φ (0.47 φ - 1.70φ) ,1.75φ (1.31φ -2.57φ) ,0.08 ( -0.32 to +1.00) and 0.82 ( 0.41 to 1.29 ) respectively .These values infer deposits of coarse to medium grained, poorly to very poorly sorted, dominantly of negative skewed and very platykurtic to leptokurtic sediments. These values suggest medium to high energy fluvio- beach to shallow marine agitated environment of some turbidity current influence. Pebbles morphometric parameters of Flatness ratio, (FR), Flatness Index (FI), Elongation ratio (ER), Maximum Projection Sphericity Index (MPSI) and Oblate Probate Index (OPI) have average values of 0.44, 44%, 0.70, 0.65 and 1.07 infer variation in the environment of deposition for the pebbles from fluvial to beach/littoral settings.. The bivariate plots of the different parameters infer predominantly of fluvial and beach influences.
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Itam
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