INTERPRETATION OF AEROMAGNETIC DATA IN BAUCHI

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INTERPRETATION OF AEROMAGNETIC DATA IN BAUCHI

CHAPTER ONE

INTRODUCTION

BACKGROUND OF THE STUDY

The study area lies between latitude 10 00’ and 11o00’N and longitudes 12o 15’ and 13o 15’E (Fig.1), in the North-eastern basement complex of Nigeria. Magnetic data over this area provide information about geological patterns at depths on which younger sedimentary rocks lie. A typical total magnetic field map is dominated by broad magnetic anomalies which are largely indicative of the regional/local magnetic variations in the deep basement rocks. (i.e. magnetic variations in the deep basement rocks). The broad magnetic anomalies arises from deep sources (long wavelength, low- frequency), and shallow magnetic sources have a short wavelength (high frequency) responses from near surface magnetic sources (Likkason 2007).

However, the geophysical/geological investigation work published in this area include hydrogeological study of Shani and Duhu carried out by Conred Nig. Ltd for the defunct North-eastern state in 1972 and 1973 and hydrological studies of Duhu area by Bassey et al (1999). Two dimensional spectral analysis of aeromagnetic data was used to determine the depth to magnetic sources in the study

(after Federal Surveys of Nigeria, 1972) area, alongside with delineating magnetic

The geology is made up of the Precambrian basement complex rocks which are considered to be undifferentiated basement complex (McCurry 1979 and Bassey et al., 1999), mainly gneisses, migmatite and granites outcropping in different parts of the study area which include, Gombi, Hong, Askira Uba and even in Garkida. Cretaceous sediment belonging to Bima sandstone and Yolde formation outcrops at the northern part of the study area (Figure 2). The tertiary to recent Volcanics (Biu basalt) are third most widespread rocks in the study area belonging to northern arm of Cameroon volcanic line. The Volcanics vary in composition from basalt to trachyte and rhyolite.

The keri-keri Formation is composed of sandstones, siltstones and shale underlying the Gombe sand stone. The formation which outcrops in this part of the study area is Palaeocene in age. The Yolde Formation is considered to be transitional between the continental Bima and marine Gongila formations. This formation shows lateral variation of Sandstone and Calcareous shale. The Bima unit varies in thickness between (100-300m).

STATEMENT OF THE PROBLEM

The Pan-African older granites are the second wide-spread group of rocks in the study area. They intruded into the Gneiss-migmatite complex. The gneiss-migmatite complex is the most widespread and occupies more than half of the area and is the oldest rock here. They are heterogeneous rock group, which is composed gneiss migmatite of various origin and series of metamorphosed basic and ultra basic rocks (Grant 1971).

SIGNIFICANCE OF THE STUDY

This work gives a depth of information which serves as a strong reference for future researchers.

OBJECTIVE OF THE STUDY

To understand the importance of application of interpretation of aeromagnetic data in Bauchi.

SCOPE OF THE STUDY

This research was conducted across different locations in bauchi

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