Depositional Environment of Tertiary Sediments in Calabar Flank: A Case Study of Pebble Morphometric Analysis Occurring Around 25km of Calabar-Itu Road, Southeastern Nigeria.
Keywords:
Pebble morphometric, Calabar Flank, paleodepositional environment, quartz pebbles, fluvial settingAbstract
Pebble morphormiteric analysis of some selected beds deposited around 25km of Calabar-Itu Road in Calabar Flank, Southeastern Nigeria, was carried out in order to determine the paleodepositional environment of the pebble suites. A total number of 700 unweathered quartz pebbles were collected from the study area, comprising of 50 samples respectively from 14 locations. The results of the pebble morphometric parameters included: Flatness Ratio (FR), Coefficient of Flatness Ratio (CFR), Elongation Ratio (ER), Maximum Projection Sphericity Index (MPSI) and Oblate Prolate Index (OPI), have average and range values of 0.55 (0.51 - 0.59), 55.32% (50.84 – 59.36%), 0.74 (0.70 - 0.76), 0.73 (0.70-0.77) and 1.50 (0.10-2.39) respectively. These values were inferred from those pebbles within the study area and were mostly found to have been deposited in a fluvial setting than in beach. Roundness values average 44.26% and ranges from 38.27% to 58.94% showing fluvial setting, while the various bivariate plots of the pebble parameters and forms show a mixing of both fluvial and beach/marine settings for pebbles found within the investigated area.Downloads
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