alexa The Geology, Geochemistry and Petrogenetic Studies of the Precambrian Basement Rocks around Iworoko, Are and Afao Area, Southwestern Nigeria
ISSN: 2381-8719

Journal of Geology & Geophysics
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Research Article

The Geology, Geochemistry and Petrogenetic Studies of the Precambrian Basement Rocks around Iworoko, Are and Afao Area, Southwestern Nigeria

Olusiji Samuel Ayodele*
Department of Geology, Ekiti State University, P.M.B. 5363, Ado-Ekiti, Nigeria
Corresponding Author : Olusiji Samuel Ayodele
Departmennt of Geology
Ekiti State University, P.M.B. 5363
Ado- Ekiti, Nigeria
E-mail: [email protected]
Received September 29, 2015; Accepted July 13, 2015; Published July 18, 2015
Citation: Ayodele OS (2015) The Geology, Geochemistry and Petrogenetic Studies of the Precambrian Basement Rocks around Iworoko, Are and Afao Area, Southwestern Nigeria. J Geol Geosci 4:212. doi:10.4172/2381-8719.1000212
Copyright: © 2015 Ayodele OS. 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 credited.
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Abstract

The geology, geochemistry and petrogenetic studies of the Precambrian basement rocks around Iworoko, Are and Afao Ekiti were carried out to determine their geochemical and petrogenetic characteristics. Three lithologies including migmatite-gneiss, granite gneiss and banded gneiss with a pegmatite dyke that occurred as an intrusion were recognized in the study area. A total of seventeen rock samples were collected from the study area which were described based on their field relationships. Ten fresh rock samples were later selected for geochemical analysis. The result of the geochemical analysis revealed that silica (SiO2) is the most abundant major oxide when compared with other oxides present in all the rock samples analyzed with an average percentage composition of 66.31%. The average percentage composition of other oxides present in all the rock samples are as follows; (16.41%) Al2O3, (3.67%) Fe2O3, (0.25%) CaO, (4.28%) K2O, (3.53%) Na2O, (1.75%) MgO, (0.78%) P2O5, (0.54%) TiO2 and (0.061%) MnO. The results of the trace and rare earth elements analyses revealed that Barium (Ba) is the most abundant with an average value of 328.7 ppm compared to other trace and rare earth elements present in the rock samples. The high concentration of barium in the migmatite-gneisses of the study area revealed the radioactive nature of this lithology. Petrological and chemical data suggests a sedimentary protolith, probably greywacke for the migmatite gneiss, gneiss and banded gneiss in the study area which may have been derived from a continental environment.

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