Indian Journal of
Science and Technology
 
 
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Issue No:11 Vol.4
November-2011
ISSN: 0974-5645
RESEARCH ARTICLES Viewers & PDF
4. Structural trends and spectral depth analysis of the residual magnetic field of Naraguta area, North central, Nigeria.
E.S. Akanbi and W.E. Mangset. .

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  • Abstract
    The results of a magnetic study of the Naraguta area, North Central Nigeria are presented here. Regional-residual separation was carried out using Least Square method. The resultant regional map revealed a regional trending in a NW-SE direction. The magnetic residual values range from -487.828nT to +405.447nT. Short to moderately long dislocations were found in the residual magnetic map. Several magnetic closures of various sizes were also noticed.  While the discontinuities indicate the presence of minor to moderately long geologic fault in the area, the closures depict the type and size of the anomalies that lie beneath the area. Magnetic lineaments trending in a NE-SW direction has been identified to pass through the study area.  This concentration of magnetic lineaments may be connected with the occurrence of younger granites in the study area since almost all known younger granite complexes lie within the region dominated by this trends.  Also a prominent ENE-WSW anomaly low has been identified in the Jos-Bukuru complex. The trend of the anomaly is believed to be roughly parallel to that of the main structural feature of the Benue trough indicating the probability that the Benue trough and the younger granite intrusive are related considering the stress, which initiated the formation of these features. 2-D spectral  analysis  of  the magnetic  anomalies  over  the  area  has  been  carried  out  in  an effort  to  estimate  the  depth  to  magnetic  sources.  The result shows that the deeper sources have an average depth of 2.03 Km while the shallower sources have an average depth of 265m.
  • Keywords: Lineaments, Trend, Magnetic Anomalies, Younger Granites.