Volume No. 7 Issue No.: 2A Page No.: 811-819 Oct. - Dec. 2012

 

AEROMAGNETIC DATA INTERPRETATION OF THE TRIPLE JUNCTION AREA OF THE UPPER BENUE TROUGH, NORTHEASTERN NIGERIA

 

Omeje Maxwell*, Wagiran Husin1, Ibrahim Noorddin2 and Paulinus E. Ugwuoke3

1.Department of Physics, Faculty of Science,Universiti Teknologi (MALAYSIA)
2.Centre for Research and Innovation Management, National Defence University, (MALAYSIA)
3.Centre for Energy Research and Development, University of Nigeria, Nsukka, (NIGERIA)

 

Received on : August 10, 2012

 

ABSTRACT

 

Airborne magnetic anomaly data over the triple junction of the upper Benue Trough, Northeastern Basement complex Nigeria, shows complicated arrangement of long wavelength anomalies, with significant magnetic low. These features are interpreted in terms of deep geologic structures and /or susceptibility variations within the basement rocks or ascribed to rocks of thick cretaceous sediments or both. The NE-SW trending of the lineament map identifies the same trending of the Benue Trough presumed they have the same structural control. The residual magnetic anomaly map indicates that Dong and Numan is smoother, which is masked off by the effect of the stronger magnetic basement likely to be sedimentary basin. The NE-SW revelation shows that this basement region is polygenetic, and has experienced magmatism, metamorphism and structural deformations. Consequently, the effects of the results to Chad Basin and Tenere Rift evolution and the relationship with dominant anomalies in the residual field are rather sporadic with values ranging from between -20 to 60 nT with the area characterized by faults. It is clear from the interpretation of the regional field that there is an uplift of the mantle and a corresponding thinning of the crust in the study area. Later mantle activity caused basult flow or basic igneous intrusion along the transform faults.

 

Keywords : Geologic map, Composite map, Regional field, Residual field, 3-D Residual field

 

 

BACK