Project Abstract

Abstract
The petrography study of sediments from the River Ero, Geregu-Ajaokuta area in Nigeria aims to provide insights into the mineral composition, texture, and sedimentary history of the region. Sediment samples were collected from different locations along the river and analyzed using petrographic techniques such as thin-section analysis and optical microscopy. The main objectives of the study were to characterize the mineralogical composition of the sediments, identify any diagenetic processes that may have altered the original mineralogical composition, and interpret the depositional environments and sediment sources. The results of the petrographic analysis revealed a diverse range of mineral constituents in the sediments, including quartz, feldspar, clay minerals, mica, and carbonate minerals. The presence of these minerals indicates a complex sedimentary history involving different source materials and transport processes. The texture of the sediments varied from well-sorted to poorly sorted, suggesting different depositional environments with varying energy conditions. The thin-section analysis provided detailed information on the mineral assemblages, grain size distribution, and fabric characteristics of the sediments. The identification of authigenic minerals and diagenetic features such as cementation, compaction, and recrystallization helped in reconstructing the post-depositional history of the sediments. The presence of cements and pore-filling minerals indicated the influence of diagenetic processes in altering the original sediment texture and mineralogy. Based on the petrographic data, the depositional environments of the sediments were interpreted to be fluvial, deltaic, and lacustrine, reflecting the dynamic nature of the River Ero system. The source materials for the sediments were inferred to be derived from the surrounding crystalline rocks, as evidenced by the presence of quartz, feldspar, and mica minerals. The sedimentary history of the region was found to be influenced by tectonic, climatic, and environmental factors that controlled the sediment transport and deposition processes. Overall, the petrography study of sediments from the River Ero, Geregu-Ajaokuta area provides valuable information on the mineral composition, texture, and depositional history of the sediments. The findings contribute to a better understanding of the geological evolution of the region and have implications for the management of sediment resources and environmental conservation in the area.

Project Overview

1.1   GENERAL STATEMENT

The study area is located in and around the Ajaokuta steel complex which is steel manufacturing complex, commissioned by the Federal Government of Nigeria in the 1980s. The company was situated in Ajaokuta so that it will be close to the source of Iron mined from the Itakpe iron formation.

The study site is part of the channel of River Ero in Geregu, a town in Ajaokuta area of Kogi State of Nigeria. Adiotomre, et al (2014) described the channel of River Ero to be over 10km long. River Ero trends NE-SW of Nigeria, and its characterized as a seasonal river that is recharged by rainwater because of the poor contribution of the groundwater in the area. In the Ajaokuta area the recharge from groundwater is not adequate because of the geographic locations. As a result River Ero is dry for most period of the dry season when the contributory tributary streams/rivers are dried up.

Petrography is an aspect of petrology that focuses on detailed description of the mineralogy and textural characteristics of rocks. The combination of petrography and geochemistry data of sedimentary rocks can reveal the nature of source region, the tectonic setting of sedimentary basins (Dickson and Suczek, 1979; McLennan et al, 1993). Tortosa et al, (1991) used the frequency of different types of quartz grains to infer the type of source rocks. Thus simple petrography of the different quartz consistent can be utilized for this purpose (Folk, 1974; Blatt et al, 1980; Asiedu et al, 2000).  

Petrological study of sedimentary rock tends to describe the mineralogical properties of the different types of sedimentary rocks as revealed by petrographic microscopy. Geochemical technique and sedimentary structures that characterized sedimentary rocks and helps to infer the dispositional origin of the rocks. Petrographic study is very necessary to unravel the characteristics of sandstone such as mineralogical constituent, cementation and effect of pressure solution (Blatt, 1967; Pettijohn, 1975).

1GEOGRAPHICAL LOCATION AND ACCESSIBILITY
The study area falls within Latitude N07˚31ʹ and N07˚38ʹ and Longitude E006˚33ʹ and E006˚43ʹ on the Lokoja topographic sheet 247NW, it forms part of the Southern Bida Basin. The study area is linked with good road network. There are minor roads and footpaths within the study area which provide access to River Ero. (Fig. 1)

Fig. 1: Map of study area showing location and accessibility

Inset: Geologic map of Nigeria after (Kogbe, 1976).

1.3   AIM AND OBJECTIVES

The aim of this project is to study the petrography of sediments of River Ero, in Geregu, Kogi state.

The objectives are:

To establish the mineral components of the river sediments.
Petrographic characteristics of the sediment.
To determine the provenance of the sediments.
To determine the transportational and depositional history of the sediments.
1.4   SCOPE OF STUDY

The project work was done in three stages. The first stage entails detailed geologic mapping of the study area. Fourteen soil samples were obtained at an interval of 200m from the field at different locations. And samples were collected from depth of about 20-25cm

The second stage includes the preparation of samples for laboratory analysis (petrographic analysis).

The final stage involves the interpretation and collation of results, and writing up of project.

1.5   SETTLEMENT AND LAND USE                                          

The study area is characterized by linear settlement with sparse population and is occupied by the Ebira people. The rural areas include Ero, Eroko and Geregu, these are located along the river bank of river Niger. Some of the village and towns in the study area are far apart and linked by footpaths and rivers. The land in the study area is mainly used for agricultural purposes, farming and fishing along River Ero being the major occupation in the area. (Fig.2)

Fig. 2: Type of Land use in the study area

1.6   CLIMATE AND VEGETATION

The climatic condition of the study area fall within the tropical climate region where wet and dry season are prevalent. Average annual rainfall is between 1100mm – 1300mm with temperature as high as 36.7ËšC.

The study area occurs within the rainforest belt with ever green vegetation which is characterized by Guinea Savannah type Vegetation and the study area comprises occasionally of stunted trees.

1.7   TOPOGRAPHY AND DRAINAGE

The study area is characterized by hills ridges of basement complex rocks. The drainage system over the areas of the basement complex is usually marked with the proliferation of many small stream channels (Olusiji, 2012). The channels of these smaller streams are dry for many months especially from November to May. The major river in study is river Niger. Others include river Ero and river Adogo, which drains into the river Niger. The drainage pattern of the study is indicated as dentritic, it develops in region underlain by homogenous materials where the subsurface geology have similar resistance to weathering such that there is no apparent control on the flow direction of the tributaries, which later join larger streams or rivers at acute angle (Olusiji, 2012).

1.8   LITERATURE REVIEW

Interest has grown among researchers to understand the mineral potential, depositional history and petrography of many stream sediments in Nigeria in the last few years, particularly in the southern part of Bida basin. Among the previous studies include Braide (1992a), Ojo and Akande (2003, 2009) Obaje et al (2004) Akande et al (2005). In the Northern Bida basin, particularly areas North of Niger River, Adeleye (1974), Braide (1992b), Olaniyan and Olabaniyi (1996), Olugbemiro and Nwajide (1997) examined the morphology of pebbles, grain size distribution, facies distribution and inferred fluvial environment for the sandstone and conglomerate. Notably, published works dealing on the research area are scarce Hence, this study is focused on the petrography of the sediments of River Ero so as to document the mineral composition, petrographic characteristics, provenance, transportational and depositional history of the sediment samples.

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Bank details are stated below.

Bank: UBA
Account No: 1021412898
Account Name: Starnet Innovations Limited


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