MAGNETIC ANOMALIES AND STRUCTURES IN SONG, HAWAL BASEMENT COMPLEX NORTHEASTERN NIGERIA

*Barka, J. **Bassey, N.E. and *Tabale, R.P.

*Department of Geology, Gombe State University

** Department of Geology, Modibbo Adama University of Technology, Yola.

E-mail: joebarka@yahoo.com

ABSTRACT

Digitized data obtained from the aeromagnetic map covering Song and environs ranges from 32640 to 33000 gammas and the amplitude of residual magnetic anomaly ranges from a minimum of -63 to a maximum of 90 gammas. Areas of positive residual magnetic anomalies were interpreted in terms of intrusive/extrusive marfic rocks owing to the geological evidence of basaltic rocks in the area while negative residual magnetic anomalies were interpreted in terms of the presence of gneisses, granites, migmatite and non-magnetic sedimentary rocks of the Tertiary age. Qualitative interpretation of the magnetic anomaly map covering the study area revealed a regional trends of N-S to NE-SW, NW-SE and E-W, this character of magnetic field support the results obtained from the structural geologic mapping of the area and could be genetically related to trends of magnetic grains within structures such as faults, foliations, joints, shear deformation, dykes and veins encountered within the area during a follow-up ground truthting.