Integrity Research Journals

ISSN: 2636-6002
Model: Open Access/Peer Reviewed
DOI: 10.31248/GJEES
Start Year: 2016

Reconnaissance geological and geochemical studies of the Precambrian rocks in Erijiyan Area, Southwestern Nigeria: Implications for mineral exploration   |   Article Number: ED22CD911   |   Vol.4 (1) - February 2019

Received Date: 15 January 2019   |   Accepted Date: 05 February 2019  |   Published Date: 28 February 2019

Authors:  Ayodele, Olusiji Samuel* and Ajigo, Isaac Ominyi

Keywords: Erijiyan, geochemistry, mineralization, petrography, statistics, weathering indices.

Reconnaissance geological and geochemical studies were carried out on the rocks at Erijiyan area to determine its mineral potentials thereby providing a framework for its exploration. Ten fresh rock samples were collected using grid controlled sampling method at a sampling density of one sample per 100sq km2. The rocks were subsequently prepared for petrographic studies followed by geochemical studies. The petrographic studies involve thin sectioning of the rocks into slides using the standard procedures while the geochemical studies include sample preparation and analyses for its major oxides and trace elements using Inductively Coupled Plasma Spectrophotometry (ICP-MS). The result of the geological mapping revealed three distinct lithologic units such as quartz schists, quartzites and pegmatites with well delineated boundaries, and the major or dominant foliation trend in the NE-SW direction. However, the results of the petrographic analysis showed dominant quartz with minor specks of muscovite while results of geochemical analysis revealed the dominance of Al2O3 and SiO2 with the quartz having an average percentage composition of 64.73%. Al2O3 indicated presence of aluminosilicate-bearing minerals such as feldspar, micas, and feldspathoids. The results of the trace elements analyses revealed that Mn is the most abundant with an average value of 1065.2 ppm while the average concentrations of other trace elements showed that Ba (1166.9 ppm), Zr (819.4 ppm), Sr (227.9 ppm) and Zn (130.7 ppm). Conclusively, The weathering index shows that the rocks in the study area are moderately weathered implying that the rocks are suitable for geochemical or mineralogical exploration.Considering the geochemical properties of the rocks in the study area, It could be deduced that Pb, Cu, Zn concentration is indicative of copper-zinc or sulphide mineralization. while. Pb, Sr, Ba and Zr also indicated the radio active nature of the rocks.

Agterberg, F. P. (1974). Automatic contouring of geological maps to detect target areas for mineral exploration. Journal of the International Association for Mathematical Geology, 6(4), 373-395.
Akanmu, T., Oshin, O. O., Ayodele, O. S. (2019). Mineralogical Characterization of theGold-bearing rocks Around Okemesi-Ijero Area, Southwestern Nigeria. Global Scientific Journals, 7(1), 34-76.
Ajibade, A. C. (1988). Structural and tectonic evolution of the Nigeria basement with special reference to N W Nigeria. International Conference Proterozoic Geology and tectonics of high- grade terrain, Ife, Nigeria.
Ajibade, A. C., & Wright, J. B. (1989). The Togo-Benin-Nigeria Shield: evidence of crustal aggregation in the Pan-African belt. Tectonophysics, 165(1-4), 125-129.
Ayodele, O. S., Oshin, O. O., & Awokunmi, E. E. (2017). Auriferous Showings in the Bedrocks and Stream Sediments of Okemesi-Ijero Area, Southwestern Nigeria. American Journal of Earth Sciences, 4(2), 8-31.
Beus, A. A., & Grigorian, S. V. (1977). Geochemical exploration methods for mineral deposits. Applied Publishing Limited. USA. 31-270.
Boyle, R. W., Tupper, W. M., Lynch, J., Friedrich, G., Ziauddin, M., Shafiqullah, C. M., & Bygrave, K (1996). Geochemistry of Pb, Zn, Cu, As, Sb, Mo, Sn, W, Ag, Ni, Co, Cr, Ba and M in the waters and stream sediments of the Bathrust-TaquetRiver District, New Brunswich. GSC Paper. 41-65.
Brandon, M. T., Roden-Tice, M. K., & Garver, J. I. (1998). Late Cenozoic exhumation of the Cascadianaccretionary wedge in the Olympic Mountains, northwest Washington State. Geological Society of America Bulletin, 110(8), 985-1009.
Dada, S. S., and Rahaman, M. A. (1995): Archean-Lower Paleozoic Crustal evolution in Nigeria. African Geoscience Review, 2(19), 43-58.
England, P., & Molnar, P. (1990). Surface uplift, uplift of rocks, and exhumation of rocks. Geology, 18(12), 1173-1177.
Feng, X., Wang, E., Ganne, J., Martin, R., & Jessell, M. (2018). The exhumation along the Kenyase and Ketesso shear zones in the Sefwi terrane, West African Craton: a numerical study. Geosciences Journal, 1-18.
Feng, X., Amponsah, P. O., Martin, R., Ganne, J., & Jessell, M. W. (2016). 3-D numerical modelling of the influence of pre-existing faults and boundary conditions on the distribution of deformation: Example of North-Western Ghana. Precambrian Research, 274, 161-179.
Freeth, S. J., (1971). Geochemical and related studies of West African igneous and metamorphic rocks. Unpublished Ph.D thesis. University of Ibadan. 240p.
Ganne, J., Bachmann, O., Feng, X. (2018). Deep into magma plumbing systems: Interrogating the crystal cargo of volcanic deposits. Geology, 46(5), 415-418.
Ganne, J., Feng, X., Rey, P., & De Andrade, V. (2016). Statistical petrology reveals a link between supercontinents cycle and mantle global climate. American Mineralogist, 101(12), 2768-2773.
Garba, I. (2003). Geochemical discrimination of newly discovered rare-metal bearing and barren pegmatites in the Pan-African (600±150 Ma) basement of northern Nigeria. Applied Earth Science, 112(3), 287-292.
Grant, N. K. (1970). Geochronology of Precambrian basement rocks from Ibadan, Southwestern Nigeria. Earth and Planet Science letters, 10, 29-38.
Jones, H. A., & Hockey, R. D., (1964). The geology of part of southwestern Nigeria. Geological Survey of Nigeria, Bulletin 31.
Kaufmann, O., & Martin, T. (2008). 3D geological modelling from boreholes, cross-sections and geological maps, application over former natural gas storages in coal mines. Computers & geosciences, 34(3), 278-290.
McCurry, P. (1973). Geology of degree sheet 21, Zana, Nigeria. Overseas Geology and Mineral Resources. No. 45, H.M.S.O. London.
McCurry, P. (1976). The geology of the Precambrian to Lower Paleozoic rocks of the northern Nigeria. In: Kogbe C. A. (ed) Geology of Nigeria, Elizabethan Publishing Company, Lagos, Pp. 67-99.
Odeyemi, I. B. (1972). Industrial Mineral Potentials of Ijero Pegmatites in Ekiti State, World Applied Science Journal, 29(3), 415-420.
Oyawoye, M. O. (1972). The basement complex of Nigeria in Dessauvagie, T. F. J. and Whiteman A. J. W. (eds) University of Ibadan 1970, 66-102.
Rahaman, M. A. (1976). Review of the basement geology of southwestern Nigeria. In: Kogbe, C.A. (ed.) Geology of Nigeria. Elizabethan Publishing Co., Lagos, 41-58.
Rahaman, M. A. and Ocan, O. O. (1978). On relationships in the Precambrian migmatititic gneiss of Nigeria. Journal of Mining and Geology, 15, 23-32.
Rahaman, M. A. (1988). Recent advances in the Study of the basement complex of Nigeria. In: Precambrian Geology of Nigeria. Geological Survey of Nigeria, Pp. 11-43.
Russ, W., (1957). The geology of parts of the Niger, Zaria and Sokoto provinces with special reference to the occurrence of gold. Nigeria Geological Survey Bulletin, 27, 42p.
Turner, D. C. (1983). Upper Proterozoic schist belt in Nigeria sector of the Pan African province of West Africa. Precambrian Research. 21, 55-79.
Watts, D. W., & Johnson, M. H. (2012). Geochemical mapping using stream sediments in west-central Nigeria. Implications for environmental studies and mineral exploration in West Africa. Applied Geochemistry, 27(6), 1035-1062.
Wright, J. S. (1976). Fracture systems in Nigeria and initiation of fracture zones in the South Atlantic. Tectonophysics, 34, 43-47.