Delineation of the Subsurface Geological Structures over Shani Basement and Environs, North-East Nigeria, Using Aeromagnetic Data

International Journal of Research and Scientific Innovation (IJRSI) | Volume VI, Issue VII, July 2019 | ISSN 2321–2705

Delineation of the Subsurface Geological Structures over Shani Basement and Environs, North-East Nigeria, Using Aeromagnetic Data

Bello Sani and Hassan U. Msheliza

Physics Department College of Education Waka – Biu , Borno State, Nigeria

Abstract: – Qualitative analysis of aeromagnetic data over Shani and its environs had been carried out with the aim of delineating mineral potential zone. The study area is bounded by 9o 30ʹ N and 10o 30ʹ N, and longitudes 11o 30ʹ E and 12o 30ʹ E. N with an estimated total area of 12,100 km2. Different enhancement techniques were used to filter the short wavelength anomalies which could give preliminary information about the magnetic minerals present in the study area. The total magnetic intensity map shows variation of both highs and lows magnetic signature ranges from – 31.9.2 nT to 220.8 nT and -29.5 nT to 213.4 nT after the removal of IGRF value of 33,000 nT; the highs which is basement dominates the north- and north-east part of the study area which corresponds to Wuyo, Walama and part of Shelleng; these are areas with promising minerals of economic potentials like, Uranium, porphyritic granite etc. The low magnetic values on the other hand, which is made up of sediment deposition also dominates the southern part of the study area, this area corresponds to southern part of Wuyo, Bargu, Kire and Shelleng and Guyuk host some industrial minerals like limestone, Clay, glass Sands, gypsum and Coal. The greenish part of the study area indicates alluvium deposition. The filters used are vertical derivatives, and horizontal derivative. The first and second vertical derivatives; shows structures like lineament that could be the host to minerals present in the study area and it trends NE-SW. The horizontal derivative map shows that magnetic amplitude highs could be found at the northern end with most lineaments delineated also conform to other filter used which could be used to mapped shallow basement structures and mineral exploration targets. Lineament map obtained from CET shows linear structures that trend in the NE-SW and E-W directions these could be interpreted as veins that are host for minerals within the area, they are predominant around Wuyo and Shani in Borno State and Shelleng in Adamawa State The results of these filters agreed largely and since most magnetic minerals are structural controls, it is expected that those lineaments identified, most especially at the northern and north east portions, could play host to those minerals aforementioned.

Keywords: Aeromagnetic, Shani, Derivatives, CET and Geological.

Read More