Citation: Usman A et al (2021). Structural Analysis of Selected Ring Complexes in Some Parts of the Nigerian Younger Granite Provinces. Saudi J Eng Technol, 6(12): 467-475. 467 Saudi Journal of Engineering and Technology Abbreviated Key Title: Saudi J Eng Technol ISSN 2415-6272 (Print) |ISSN 2415-6264 (Online) Scholars Middle East Publishers, Dubai, United Arab Emirates Journal homepage: https://saudijournals.com Original Research Article Structural Analysis of Selected Ring Complexes in Some Parts of the Nigerian Younger Granite Provinces Usman A 1* , Lawan AM 2 , Lawal MM 3 , Jonathan LA 4 , Sununu ST 5 1, 3-5 Department of Physics Kebbi State University of Science and Technology Aliero 2 Department of Geology Skyline University Kano DOI: 10.36348/sjet.2021.v06i12.004 | Received: 03.11.2021 | Accepted: 05.12.2021 | Published: 16.12.2021 *Corresponding author: Usman A Abstract The study area falls within the basement complex of northcentral Nigeria and covers four adjacent quarter degree sheets of 126 (Ririwai), 127 (Kalatu), 147 (Lere) and 148 (Toro) in some parts of Kaduna, Bauchi and Plateau States, Nigeria. This paper is aimed at interpreting the Aeromagnetic data to delineate structures in some parts of the Nigerian younger granite province. This was achieved by determining depth to basement, and developing a 2D model of the shape, location and depth of structures in some parts of the younger granite province. The anomalies on the aeromagnetic map were defined by fitting a first order polynomial to the total fields, by the method of least squares to obtain the residual field data. First vertical derivative and analytic signal computed, defined distinct pattern of the magnetic signatures. Depths to the source of the geologic structures where obtained from Werner and Euler deconvolution solutions which gives an average depths range of 231.2 m to 1040 m, with very few solutions having depths less than 200 m, the most prominent structure particularly the Ririwai ring complex have a depth range of 337.5 m to 465.5 m. The depth to basement for Werner solution ranged from 60 m to 420 m and the depth to basement of the contact model is shallow with depth of (60 to 420m) as compared to the dike model (200 to 420 m). Keyword: Werner Deconvolution; Euler Deconvolution; Analytic Signal; Model; Vertical derivatives; Younger Granite; Ring Complex. Copyright © 2021 The Author(s): This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC BY-NC 4.0) which permits unrestricted use, distribution, and reproduction in any medium for non-commercial use provided the original author and source are credited. INTRODUCTION 1.1 Introduction The topography of Nigeria is influenced by planar and linear structures resulting from ductile and brittle deformational events [15]. The structures generally have N-S, NE-SW, NW-SE and sometimes E- W trends [23]. Regional strikes of foliations in basement rocks, lithologic boundaries, fold axes and axial planes maintain the N-S Pan-African imprint. The younger Granite province of Nigeria occupies an area of about 22,000km 2 and is located in the central part of Nigeria. The Younger Granite are a set of Jurassic ring complexes of Pre-Cambrian age. About forty ring complexes have been reported to date and these are scattered over much of the central plateau region of Nigeria with a few located on the fringes of Benue Trough [16]. The Younger Granite are typically circular to elliptical in outline and have diameters which range from 10km to 25km. They are often composed of outer ring dyke of fayalite granite porphyry which surround down- faulted volcanic and basement rocks as well as an inner core of composite granitic intrusion [6]Younger Granite contains important precious minerals such as cassiterite, beryllium, columbite, ryanite, silimanite and other accessory minerals of economic importance. Nigeria’s tin field which are among the most important in the world are closely associated with younger granite province. The ages of the granite decreases from North to South [22]. However since geologic features are often large, structural analyses are conducted on regional scales, to provide a comprehensive look and a concise information about the extent of faults, folds, lineaments and other structural features. These therefore require small-scale imagery to cover the extent of the element of interest. This study is intended to obtain information about the depths to magnetic sources, their orientation, shape and sizes. Thereby helps in gaining better insight of the structural set-up in the area.