THE PETROLOGY OF THE METAPYROCLASTIC ROCKS OF IGARRA IN WEST (AKOKO-EDO) EDO STATE, NIGERIA
Abstract
This study explores the geology of Igarra, located in the Akoko-Edo Local Government Area of Edo State, Nigeria, focusing on its lithological diversity, structural geology, and the petrology of metapyroclastics. Igarra, within the southwestern Nigerian Basement Complex, exhibits a rich geological framework shaped by the Pan-African orogeny and subsequent tectonic and metamorphic processes. The region features a variety of lithological units, including migmatite-gneiss complexes, schist belts, and Pan-African granitoids, alongside economically significant rock formations. Field studies identified key structural features such as complex folding, faulting, and shear zones indicative of intense tectonic deformation. metapyroclastics in the region, specifically studied through petrographic analysis, were found to consist of poorly sorted, coarse-grained lithologies with significant contributions from quartz, feldspar, biotite, and ironized fragments. The clasts within the metapyroclastics are matrix-supported and exhibit varying degrees of metamorphism, with foliated textures highlighting tectonic alignment. Thin section analysis revealed undulose extinction in quartz, altered feldspar, and opaque minerals, indicating deformation under low to medium-grade metamorphic conditions. The findings underscore the geological significance of Igarra as a window into the tectonic history and metamorphic evolution of the Nigerian Basement Complex. The mineralogical and structural data also point to the economic potential of Igarra, with abundant feldspar, quartz, and mica suitable for industrial applications in ceramics, construction, and glass manufacturing. This research contributes to the understanding of Precambrian geology and Pan-African tectonics, providing a detailed account of the petrological characteristics of metapyroclastics in Igarra. It advocates for further geochronological studies to refine the tectonothermal history of the region and sustainable exploration of its mineral resources, ensuring both scientific advancement and economic development.
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