Petrographical and Geochemical Studies on the Granitic Rocks Around  Igarra-Ugbogbo Area, Southwestern Nigeria

Authors

  • Ovie Odokuma-Alonge Department of Geology, Faculty of Physical Sciences, University of Benin, Benin City, Edo State, Nigeria
  • Rita Godfrey Akro Department of Geology, Faculty of Physical Sciences, University of Benin, Benin City, Edo State, Nigeria

Keywords:

granitoids, geochemical, minerals, alumina, magma

Abstract

Seven samples of granitic rocks from Igarra-Ugbogbo area in Akoko-Edo Local Government Area of Southwestern Nigeria were obtained with the aim of determining their geochemical and mineralogical properties using XRF, XRD techniques and thin section. Thin section results revealed the optical properties of the minerals present and their behaviours to light. The photomicrographs reveal the presence of various minerals such as quartz, microcline, plagioclase, muscovite and biotite. Results of the geochemical analysis revealed the presence of SiO2 (56.99-71.22wt.%), Al2O3 (13.55-20.76wt.%), Fe2O3(T)* (3.55-5.85wt.%), K2O (0.95-7.21wt.%), Na2O (2.82-3.98wt.%), CaO (1.88-3.03wt.%) and MgO (0.50-1.56wt.%). The abundance of these major oxides in the samples showed that samples UGB 02, UGB 03, UGB 04, UGB 05 and UGB 07 are probably from a felsic magma and UGB 01 and UGB 06 from an intermediate magma. Using Al2O3 classification schemes, its showed that  the samples fall into the metaluminous and peraluminous field. The XrD analysis revealed the presence of quartz, alkali feldspars (microcline, orthoclase and sanidine), plagioclase feldspars (albite and anorthite), muscovite, lepidolite, petalite, amblygonite and illite. The modal composition of the quartz, alkali feldspar, plagioclase was plotted on a QAP diagram which showed that the rock falls within the granitoidal class (granite and granodiorite). The trace element plot of Rb versus (Y+Nb) reveal their tectonic setting to be from post-collision  to within-plate granitoids.

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Published

2025-04-30

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Vol. 7 No. 1 (2025)

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Articles

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Copyright (c) 2025 Dr(Mrs). Ovie Odokuma-Alonge, Rita G. Akro

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