Geological Mapping, Petrological Study and Structural Analysis of Complex Rocks in Ife-South Local Government Area of Osun State South Western Nigeria

International Journal of Research and Scientific Innovation (IJRSI) | Volume VI, Issue XI, November 2019 | ISSN 2321–2705

Geological Mapping, Petrological Study and Structural Analysis of Complex Rocks in Ife-South Local Government Area of Osun State South Western Nigeria

Ojedokun Ruth Ojetejumola^1* and Fawole Olakunle Ayofe²

^1,2Forestry Research Institute of Nigeria, P. M. B. 5087, Jericho, Ibadan, Oyo State, Nigeria
*Corresponding Author

Abstract: – Geologic map is an important planning tool for the economic growth of a nation, it displays the arrangement of geologic features of a particular area. It has been observed that the available geologic map of Nigeria omits some local geology of interest which is the reason local geological mapping must be encouraged. Mapping of the Study area was carried out by traversing along dip direction i.e west east direction from one location to another with the aid of a base map, compass clinometer and a geographic positioning system. Samples were taken across various locations where there was an outcrop, these samples were taken to the laboratory for further analysis. The result shows that the study area consist of gneiss, granite gneiss and amphibolite. Gneiss which shows metamorphic grade up to the amphibolite facies. Compositionally, they are predominantly granodiorite but vary from diorite through tonalite to granite. Metamorphosed basaltic dykes also occur in the area as sheet of amphibolite. Two phases of deformation was recognized; the first phase attained granulite facies while the second phase was associated with cataclastic and probably retrogression to the amphibolite facies. Systematic structural mapping and study of the area also confirmed different types of structures such as fractures, quartzo-feldspathic veins, joints and quartz-veins. The overall results showed the study area is a manifestation of Precambrian deformation which was revealed by the several structural features found in the area.

I. INTRODUCTION

Several work from various researchers on the geology of Nigeria have provided a great depth of knowledge about the countries geological settings. Similarly, a number of geologists have done extensive work and research in the study area which lies between latitude 70 12 and 70 15 and longitude 40 30 and 40 32 of Ife-Ilesa Schist belt ,the Older granites and Charnockitic rocks in Akure Ondo state, (Rahaman, 1988; Dada, 2006 ;Odeyemi, 1977; Obaje, 2009).

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