Application of 3D Euler deconvolution of aeromagnetic data and pseudogravity transforms in mineral exploration: a case s
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ORIGINAL PAPER
Application of 3D Euler deconvolution of aeromagnetic data and pseudogravity transforms in mineral exploration: a case study of the pegmatite-rich zones of Lafiagi, Central Nigeria A.K. Olawuyi 1 & B.D. Ako 2 & G.O. Omosuyi 2 & A.O. Adelusi 2
Received: 21 August 2015 / Accepted: 5 October 2016 # Saudi Society for Geosciences 2016
Abstract Structural evaluation of the pegmatite-rich zones in a part of Lafiagi (Sheet 203), Central Nigeria, was carried out. It was aimed at identification of the structures responsible for the rich mineralization of the area. This work involved the qualitative and quantitative analysis of aeromagnetic data and pseudogravity transforms by using Oasis Montaj™ software. The 3D Euler deconvolution results from acquired aeromagnetic data and pseudogravity transforms augmented with geological information obtained from reliable sources were employed in the structural interpretation work. The results have shown that the abundance of 2D and 3D structures that are commonly associated with gemstones and precious minerals explain why the study area is rich in mineral deposits. Keywords Pegmatite-rich zones . Mineralization . Deconvolution . Structures . Aeromagnetic and pseudogravity
Introduction The study area covers a part of Lafiagi (Sheet 203) in the Nigerian topographical map. It is situated at the transition environment between the Nupe Basin and the southwestern Nigerian basement complex. It is bounded by latitudes 8° 40′ and 8° 51′ N and longitude 5° 00′ and 5° 23′ E, covering an area of 896.6 km2 (Fig. 1a, b). The Nupe Basin is a NW–SE trending embayment (Fig. 1a) perpendicular to the main axis * A.K. Olawuyi [email protected]
1
Department of Geophysics, University of Ilorin, Ilorin, Nigeria
2
Department of Applied Geophysics, Federal University of Technology, Akure, Nigeria
of the Benue Trough and the Niger Delta Basin of Nigeria. It is frequently regarded as the northwestern extension of the Anambra Basin, both of which were major depocenters during the transgressive cycle of Southern Nigeria in the Late Creataceous times (Murat 1972). It has rocks of sedimentary basin flanked by the basement complex rocks of southwestern and north central Nigeria. Evidence from the eastern and northern margins of the West African craton indicates that the Pan-African belt evolved by plate tectonic processes which involved the collision between the passive continental margins of the West African craton and the active continental margin (Pharusian belt) of the Tuareg shield about 600 Ma ago (Leblanc 1981; Black et al. 1979; Caby et al. 1981). The collision at the plate margin is believed to have led to the reactivation of the internal region of the belt. The Nigerian basement complex lies at the reactivated part of the belt. The Pan-African in Nigeria was followed by conjugate strike slip fault systems which average in the NE–SW and NW–SE direction and which show dextral and sinistral sense of displacement which cut across the earlier Pan-African structures (Wright 1976; Ball
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