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Uzoegbu M Uche
Ikwuagwu C.S
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Ikwuagwu C.S
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International Journal Geology and Mining

Sedimentological characteristics of Ajali sandstone at Okigwe, Anambra basin, SE Nigeria

Uzoegbu, M.U. and Ikwuagwu, C.S

Department of Geology, College of Physical and Applied Sciences, Michael Okpara University of Agriculture, Umudike, PMB 7267, Umuahia, Abia State.

Accepted 08 June, 2016.

Citation: Uzoegbu MU, Ikwuagwu CS (2016). Sedimentological characteristics of Ajali sandstone at Okigwe, Anambra basin, SE Nigeria. International Journal Geology and Mining 2(1): 038-052.

Copyright: © 2016 Uzoegbu and Ikwuagwu. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Abstract

The Ajali sandstones exposed along Enugu-Port Harcourt Express Road at Okigwe, Imo State, Nigeria were studied to evaluate textural parameters, mineralogy, and statistical measures to depict the depositional pattern of sediments. A total of eleven samples were collected for this study from five locations based on their stratigraphic position (i.e. from top to bottom). Results of grain size analysis reveal a unimodal frequency distribution which indicates a single provenance for the sandstones. Statistics reveals a graphic mean range from 1.5 to 2.8, sorting range from 0.45 to 1.58, skewness range from -0.58 to 0.32, and kurtosis between 0.38 and 2. The sandstones are false bedded and burrowed, medium to fine grained, poorly to moderately sorted, strongly coarsely skewed and platykurtic. The sandstones generally lack of microfauna and macrofossils. Mineralogically, the sandstones contain, on the average, 32.56% monocrystalline quartz, 9.33% polycrystalline quartz, 16.09% plagioclase, 25.91% potassium feldspar, 4.88% clay matrix and 14.27% opaque. The major framework composition classifies the sandstones as sub-feldspathicarenite. Bivariate and multivariate results reveal shallow the Ajali sandstones may have been deposited at fluvial deltaic to marine environments

Keywords: Sandstone, grain-sizes, structures, depositional environment, Okigwe, Anambra basin, Nigeria