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Uzoegbu M Uche
Ifeoma Ekeleme
A.E Olorunyomi
I.E Abalaka
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Uzoegbu M Uche
Ifeoma Ekeleme
A.E Olorunyomi
I.E Abalaka
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International Journal Geology and Mining

The geologic investigations of rocks around Angwan Madaki and its environs, North Central Nigeria

Ekeleme I.A., Uzoegbu M.U., Olorunyomi A.E. and Abalaka I.E.

Accepted 12 March, 2017.

Citation: Ekeleme IA, Uzoegbu MU, Olorunyomi AE, Abalaka IE AI (2017). The geologic investigations of rocks around Angwan Madaki and its evirons, North Central Nigeria. International Journal Geology and Mining 3(1): 090-102.

Copyright: © 2017 Uzoegbu et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Abstract

The studied area lies within Latitude 8⁰41'40''N and 8⁰52'40''N and Longitude 8⁰41'10''E and 8⁰45'10''E within the North Central Nigerian Precambrian Basement Complex. It is bordered by Angwan Mission in the North, Konva in the West, River Arikiya in the South and Farin Ruwa in the south East. The rock types include the Precambrian gneisses; granite and porphyroblastic gneiss, banded gneiss and migmatites with characteristic pegmatites and vein intrusions. These rocks experienced various tectonic episodes which resulted to their different structural styles such as mineral lineation, foliation, jointing, veins, faults, dykes and minor folds. The geological mapping of the area reveals five (5) dominant lithologic units namely; migmatites, banded gneiss, granite and porphyroblastic gneiss, older granites and dolerite respectively. Systematic structural mapping of the area also confirmed the preponderance of different folds such as crenulation fold and ptygmatitic fold. Other structures such as dykes, joints, quartz-veins, fractures and micro-faults were detected on the rocks. The overall result showed that the studied area is a manifestation of Pan African deformation as revealed by the magnitude and style of the folding and other structural features of rocks in the area. Petrographic studies also reveal the mineral assemblages and structural features that were key in identifying these rock types.

Key words: Basement Complex, lithologic units, Petrography, Precambrian, Older granite, Structural styles.