SPECTRAL ANALYSIS OF AEROMAGNETIC DATA OVER LONGUDA PLATEAU AND ENVIRONS, NORTH-EASTERN NIGERIA

The investigation involve the analysis of lineraments and spectral analysis of total ­intensity magnetic field data over the Longuda Plateau and environs, Guyuk area. The total magnetic field map exhibit direction of NE-SW and E-W lineraments. The NE-SW lineraments coincide with Longuda basalts while the E-W coincide with the Yola arm of Benue Trough. Result from spectral analysis of the aeromagnetic data indicate two depth source model. The depth to deeper magnetic sources ranges from 1900m to 2620m and could be identified with the basement. The shallow magnetic source ranges from 512m to 670m this could be attributed to near surface intrusive. And laying river valleys in the study area. The results obtained from the study compared favorably with that from Gravity studies