AN INTERPRETATION OF THE AEROMAGNATIC DATA FROM THE NORTH- CENTRAL PART OF THE CHAD BASIN IN NIGERIA.
AN INTERPRETATION OF THE AEROMAGNATIC DATA FROM THE NORTH- CENTRAL PART OF THE CHAD BASIN IN NIGERIA.
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Date
2000-09
Authors
TAHIR, OLASUPO - ADELEKE OYETUNJI
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Abstract
ABSTRACT
An Interpretation of the aeromagnetic data over part (sheets 21, 22, 42, 43, 64 and 65)
of the Chad Basin, which lies within longitudes 11.5° E and 12.5 ° E and latitudes 12.0°
Nand 13.3° N, was carried out. A qualitative interpretation of the total field maps in the
above sheets shows that most of the anomalies (source bodies) have NE - SAV alignment
and few with E - W and NW - SE trends. Quantitative analyses using the Werner
dcconvolution method and 2 1/2 - Dimensional modelling, using the GM - SYS program
reveal, that the depth to the magnetic basement varies from 0.3 km to 2.1 km in the
study area. The 2 1/2 - D modelling method revealed the presence of intrusions scattered in
different places in the study area. The thickness of the intrusions range from 0.1-18 km
and their lengths vary from 0.1 km - 12 km. Shapes of intrusions obtained correspond to
vertical dyke of basic igneous rock as interpreted from the modelling technique. The
study further suggests that the susceptibilities of the intrusions (0.0069 to 0.0092 SI
Units) are greater than those of the host rock (0.0059 SI Units).
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Description
DEPARTMENT OF PHYSICS,
AHMAD BELLO UNIVERSITY
ARIA - NIGERIA.
Keywords
INTERPRETATION.,, AEROMAGNATIC,, DATA,, NORTH- CENTRAL,, CHAD,, BASIN,, NIGERIA.