Petrochemistry of Granitic Rocks in Gwada, North Central Nigeria

G.N. Sambo¹ , M. Adegbe² , ³ , E.A. Onimisi⁴

1. Department of Geology, School of Physical Sciences, Federal University of Technology, Minna, Nigeria.
2. Department of Geology, School of Physical Sciences, Federal University of Technology, Minna, Nigeria.
3. Department of Geology, School of Physical Sciences, Federal University of Technology, Minna, Nigeria.

Section:Research Paper, Product Type: Journal-Paper
Vol.6 , Issue.3 , pp.32-38, Mar-2020

Online published on Mar 30, 2020

Copyright © G.N. Sambo, M. Adegbe, , E.A. Onimisi . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Gwada area of North Central Nigeria was mapped and the petrochemical classification of the granitic rocks was conducted. Detailed fieldwork and petrochemical analysis of six rock samples using Energy Dispersive X-Ray Fluorescence (EDX-RF) spectrometer of the Minipal 4 model at the Nigerian Geological Survey Agency, Kaduna were the methodology that was adopted for this research work. Field investigation shows that the study area is underlain by two main lithologies which are highly weathered schist and granite which covers part of the Northwesthern portion of the area. The granites in the study area occur as an intrusion into the highly weathered schist. Petrochemical analysis of the rock samples reveals that the SiO2 content ranges from 70.09 wt% to 72.02 wt% with an average of 71.20 wt%, and the Al2O3 ranges from 11.21 wt% to 12.46 wt% with an average value of 11.93 wt%. Also, K2O ranges from 6.98 wt% to 8.70 wt% having an average of 7.74 wt%. The CaO ranges from 3.30 wt% to 5.01 wt% with an average of 4.30 wt%. The Na2O content ranges from 0.94 wt% to 1.65 wt%, having an average value of 1.28wt% and the Fe2O3 ranges from 2.54 wt% to 3.10 wt% with an average of 2.95 wt%. Similarly, the average content of MnO, MgO and TiO2 are 0.11 wt%, 0.42 wt% and 0.69 wt% respectively. Therefore, conclusions can be drawn that the granites in the area are High-K calc-alkaline and are of the metaluminous suite of granitic rocks following the petrochemical studies.

Key-Words / Index Term :
Schist, Granite, Metaluminous, High-K Calc-alkaline, Basement Complex, Minna

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