Delineation of structural features and hydrothermal alteration zones using integrated geophysical data of part of North-central Nigeria

Abstract

Delination of possible structural features in part of Nigeria Northcentral region has been performed using high-resolution aeromagnetic and aero radiometric data. The objectives of this work are to identify and harness the factors responsible for alteration zones which can serve as a potential mineralized sources for exploration purpose in the area. To achieve this purpose, mathematical techniques such as First Vertical Derivative, Analytic Signal, and Centre for Exploration Targeting (CET) grid were performed on the aeromagnetic data analysis and interpretation; in addition, ratios of radioelements were obtained to support the mapping process. The results obtained showed that the area is dominated by structures trending Northeast-Southwest, Northwest, Northeast, Eastwest and Northsouth directions, although the structures trending Northeast-Southwest were found to be most predominant and considered as orientations of mineral deposits in the area. Also, aero radiometric analysis based on the concentrations of Potassium, Uranium, Thorium and their ratios revealed lithological units and hydrothermal alterations of the area. However, this study concluded by identifying and harnessing the factors responsible for alteration zones which can serve as a potential mineralized sources for exploration purpose in the area.

Keywords

• Structural features
• aeromagnetic data
• aero radiometric data
• lineaments
• RHP
• CET