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THE GEOLOGICAL AND GEOPHYSICAL SURVEY OF OBEAGU AND ENVIRONS, IN AWGU LOCAL GOVERNMENT AREA OF ENUGU STATE

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Abstract

The geological and geophysical survey of Obeagu and environs in Awgu local government area of Enugu state. In other to study the area, various lithologies and description of the exposed outcrop sections based on their sedimentological characteristics were identified, dip and strike was taken on outcrops with natural bedding planes to get Azimuths of the beds. lithological and formation boundaries were delineated and indicated on the topographic map and other branches of geology like hydrogeology, economic geology, engineering geology and environmental geology were studied and interpreted and geophysical surveys were done. Also studies of existing literature, reconnaissance survey were done to have a pre-knowledge of the study area. Field mapping and samples were collected in order to carry out laboratory analysis such as grain size, Atterberg’s limit test and water analysis to have a better knowledge of the area. The study area is made up of three geologic formations which are the Owe

INTRODUCTION

1.1       BACKGROUND OF THE STUDY AREA

The study is located in Obeagu, Awgu LGA of Enugu state. The major villages covered are Obeagu, Amoli-Owelli, Egwuachi, Awgunta and Mmaku. The study area is a rural area with no major industries present. The settlement pattern is dispersed. The occupations practiced by the indigenes in the study area include Quarrying, farming, fishing and transporting. The major means of transportation is by vehicles, bicycles and motorcycles.

Surface water has been the major source of water for both domestic and industrial water supply in the area, which is known to be prone to contamination. However, with the intention of introducing recent technological development to make groundwater to be the choice of water supply in the area, electrical resistivity survey was conducted to determine the depth of aquifer in the area.

Electrical resistivity method is one of the geophysical methods used in groundwater exploration. The subsurface information inferred from this survey gives a better knowledge of the aquifer systems and a more realistic picture of groundwater potential of any area. The technique has been successfully used in investigating groundwater potential in different geological settings. Also this method was used to explore for groundwater in a sedimentary environment (Emenike, 2000). In this study, vertical electrical sounding was used to establish the occurrence and depth of groundwater within the part of Obeagu area in the Anambra Basin.

Although some work might have been done in the area in the past, the records were not well documented. This work will help to facilitate further studies on the geology of the area.

 

 

1.2       LOCATION AND ACCESSIBILITY

The study area is located in Obeagu and environs which lies within 007° 23? E and 007° 27? E and latitude 06° 7? N and 06° 11? N. The study area has an area extent of about 44.6 km

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. The area of study encompasses Obeagu, Amoli-Owelli, Egwuachi, Awgunta and Mmaku  in Awgu Local Government Area in Enugu State. It is accessible through Enugu-Port Harcourt expressway by Akinaukwa junction or through the Oji-Agwu express way.

Fig 1.1: Accessibility map of Obeagu

 

 

1.3       AIM AND OBJECTIVES

The aims and objectives of this research work include:

1. To identify various lithology and description of the exposed outcrop sections based on their sedimentological characteristics.
2. To take dip and strike in an outcrop within the study area in other to get the azimuths of beds.
3. To delineate boundaries between one lithology and the other, or between one formation and another.
4. To identify and interpret the valuable economic deposits, hydrogeology, engineering and environmental geologic features in the area and to carry out geophysical survey.
5. Take photographs and rock samples for sieve analysis, water analysis, Atterberg and liquid limit test.