SPECTRAL ANALYSIS AND INTERPRETATION OF AEROMAGNETIC ANOMALIES OVER SOKOTO BASIN, NIGERIA.
SPECTRAL ANALYSIS AND INTERPRETATION OF AEROMAGNETIC ANOMALIES OVER SOKOTO BASIN, NIGERIA.
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Date
1994-01
Authors
OGANIJA, SAMBO SHEHU
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Abstract
Aeromagnetic data of the Sokoto Basin have been analysed by
two-dimensional spectral analysis to determine the lateral
variation in the Sedimentary thickness and structures under the
basin. The area investigated cover the portion of the basin
between latitude 10°30'N and 14°N, longitude 3°30'E and 6°30'E.
Spectral depth determinations to magnetic sources in the region
gave three depth ranges namely 0.11 km to 0.28 km, 0.50 km to
1.40 km and 0.79 km to 1.85 km. The depths varying between 0.11
km and 0.28 km refer to the contribution by the near surface
disturbances, while the deeper depth ranges varying between 0.50
km and 1.40 km refer to a magnetic level corresponding to the
basement surface. The depth ranging between 0.79 km an 1.85 km
may correspond to the top of structures within the basement. A
magnetic depth to basement map revealed that the basement surface
is generally shallow and attain a maximum depth of 1.40 km at the
centre of the basin. In general, the magnetic data revealed an
irregular basement floor resulting from gentle folding of the
basement rocks along a general N-S axis. Sediment-filled troughs
and depressions on the basement surface have been revealed and
these form targets for ground water exploration. The absence of
major faulting even at the sediment-basement boundary tend to
suggest that the Southeastern sector of the Iullemmeden Basin
probably originated from the tectonic movement within the
Precambrian basement rocks.
Description
A thesis submitted to the Postgraduate School,
Ahmadu Bello University, Zaria in partial fulfilment
of the requirements for the award of the degree of
Master of Science in Applied Geophysics.
Keywords
SPECTRAL, ANALYSIS, INTERPRETATION, AEROMAGNETIC, ANOMALIES, OVER, SOKOTO, BASIN, NIGERIA