Investigation of Magnetic Anomalies of Chibok and Damboa Areas in North Eastern Nigeria

– Investigation of Magnetic Anomalies of Chibok and Damboa Areas in North Eastern Nigeria –

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Abstract

The aeromagnetic data of Chibok (sheet 134) and Damboa (sheet 112) areas, southern Chad basin were interpreted qualitatively and quantitatively.

Spectral Analysis, Source Parameter Imaging (SPI), Standard Euler deconvolution, Forward and Inverse modelling methods were used in the quantitative interpretation with the aim of determining depth to the magnetic source bodies,

magnetic susceptibilities and the possible mineralization in the area. Oasis Montaj 6.4.2, WinGlink 1.62.08, Surfer 11 and Microsoft Excel software were employed in the data analyses.

The estimated depths from the forward and inverse modelling methods for profiles 1-7 are 2749, 2201, 2088, 703, 521, 927 and 481 m respectively.

The respective susceptibility values were 0.20407, 0.47779, 7.8043, 0.1349, 0.0889, 0.3083 and 0.4820 SI, which indicate the presence of sedimentary intrusions (basalt or limestone), few  metamorphic  rocks (schist) and minerals (magnetite).

Spectral analysis revealed two depth sources with the  deep  sources  ranging  from  1485.3  4093.6  with  an  average depth value of2390.1 , while the shallow depth sources range from 405 844  with an average depth value of 567  .

The temperatures at these  depths range from 81.65°C to 169.16°C for the deeper sources and from 31.12°C to 32.82°C for the shallow sources.

Introduction

1.1 Background of the Study

Geophysics means the physics of the Earth and its environment. Its subjects  include  the shape of the Earth, its gravitational and magnetic fields, the dynamics of the  Earth as  a  whole and of its component parts, the Earth’s internal structure,  composition and  tectonics.

Also, the generation of magmas, volcanism and rock formation, the hydrological cycle including snow and ice, all aspects of the oceans, the atmosphere, ionosphere, magnetosphere and solar-terrestrial relations, and analogous problems associated with the Moon  and  other planets (Cheminet al.,2006).

Geophysics is applied to societal needs, such as mineral resources, mitigation of natural hazards and environmental protection (Cheminet al.,2006).

Geophysical methods may be applied to a wide range of investigation from studies of the entire Earth, to exploration of a localized region of the upper crust.

Geophysical surveying, although sometimes is prone to major ambiguities or uncertainties of interpretation, provides a relatively rapid and cost- effective means of deriving an information about the subsurface  geology  (Keary  and  Brooks, 1984).

Geophysical survey data are used to analyze potential petroleum  reservoirs and mineral deposits, to locate groundwater and archaeological findings, to find the thicknesses of glaciers and soils, and for environmental remediation.

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