Geochemical Trends in Weathering Profiles and Their Underlying Precambrian Basement Rocks in Akure, Southwestern Nigeria

Oluwatoyin O. Akinola (Department of Geology, Ekiti State University, Ado-Ekiti, Nigeria)
Olusola A. Ola Olorun (Department of Geology, Ekiti State University, Ado-Ekiti, Nigeria)

Abstract


Akure area in southwestern Nigeria falls within the basement complex underlain by migmatite, quartzite granite and charnockite. Geochemical features of these crystalline rocks and their overlying in-situ weathering profiles are investigated and reported. Analytical result from ICP-MS facility at the University of Malaya reveals average SiO2 content in quartzite (91.1%), granite (73.8%), migmatite (67.4%) and charnockite (58.6%) categorize the rocks as siliceous. SiO2 contents in the weathering profiles above these rocks are 61.9%, 60.2%, 52.2% and 54.6% respectively. Alumina contents in the weathering profiles overlying quartzite (23.8%), granite (19.9%), migmatite (26.3%) and charnockite (24.3%) are substantially higher than the precursor rocks. In the same order, average alkali (Na2O+K2O) contents in the profiles are 3.38%, 3.42%, 3.48% and 2.68%. Chemical features of the profiles reflect that there exists some correlation between the chemistry of crystalline basement and their in-situ weathering profiles. The residual soils contain low plastic clays with kaolinitic characteristics and compare well with other clays reported from other parts of Nigeria basement complex.


Keywords


Akure;Nigeria;Geochemical trends;In-situ weathering profile;Kaolinitic

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References


[1] Oyawoye, M.O. (1964). The Geology of the Nigerian Basement complex. Journal of Mining and Geology, 1, 87-102.

[2] Odeyemi, I.B. (1981). A review of the orogenic events in the Precambrian basement of Nigeria, West Africa. Geologische Rundschau, 70(3), 897-909.

[3] Ajibade, A.C., Woakes, M. and Rahaman, M.A. (1987). Proterozoic crustal development in the Pan-African Regime of Nigeria. In: Kroner, A. (Ed.), Proterozoic Lithospheric Evolution AGU, Washington DC.

[4] Rahaman, M.A (1988). Recent advances in the study of the basement complex of Nigeria. In: Precambrian Geology of Nigeria (Oluyide, P.O; Mbonu, W.C;Ogezi, A.E; Egbuniwe, I.G; Ajibade, A.C and Umeji, A.C. (Eds.), a publication of Geological survey of Nigeria.

[5] Elueze, A.A. (1986). Petrology and Gold mineralization of the Amphibolite belt. Ilesha area Southwestern Nigeria. Geologic on Mijnbouw, 65, 189-195.

[6] Ekwueme, B.N. (1990). Rb-Sr ages and petrologic features of Precambrian rocks from the Oban Massif, southeastern Nigeria. Precambrian Research, 47(3-4), 271-286.

[7] Dada, S.S. (2006). Proterozoic Evolution of Nigeria. In: Oshin, O. (ed.) The Basement Complex of Nigeria and its Mineral Resources. Petrochemical Services Ltd. Ibadan, Nigeria. 29 - 45.

[8] Okonkwo, C.T. and Folorunso, I.O. (2013). Petrochemistry and geotectonic setting of granitic rocks in Aderan Area, SW Nigeria. Journal of Geography and Geology, 5(1), 30.

[9] Hurley, P.M., Fairbairn, H.W. and Pirson, W.H. (1966). Continental drift investigations. Massachussets. Institute of Technology, U.S.A. 14th Annual Progress Report., 1381-14, UASEC, 3-15.

[10] Hubbard, F.H. (1975). Precambrian crustal development in western Nigeria: Indications from the Iwo region. Geological Society of America, Bulletin, 86, 548-554.

[11] Dada, S.S., Lancelot, J.R. and Briqueu, L. (1989). Age and origin of the annular charnockitic complex at Toro, Northern Nigeria: U-pb and Rb-Sr evidence, Jour. African Earth Sciences, 9:227-234.

[12] Ekwueme, B.N., and Kröner, A. (2006). Single zircon ages of migmatitic gneisses and granulites in the Obudu Plateau: Timing of granulite-facies metamorphism in southeastern Nigeria. Journal of African Earth Sciences, 44(4-5), 459-469.

[13] Okonkwo, C.T. and Ganev, V.Y. (2012). U-Pb Geochronology of the Jebba granitic gneiss and its implications for the paleoproterozoic evolution of Jebba area, southwestern Nigeria. International Journal of Geosciences, 3, 1065-1073. http://dx.doi. org/10.4236/ijg.2012.35107

[14] Fitches, W.R., Ajibade, A.C., Egbuniwe, I.G., Holt, R.W. and Wright, J.B, (1985). Late Proterozoic schist belts and plutonism in NW Nigeria. Journal of Geological Society London, 142, 319- 337.

[15] Elueze, A.A. (1992). Rift system for Proterozoic schist belts in Nigeria. Tectonophysics, 209, 167-169

[16] Caby, R. and Boesse, J.M. (2001). Pan-African nappe system in southwest Nigeria: the Ife-Ilesha schist belt. Journal African Earth Sciences, 33, 21-30.

[17] Danbatta, U.A. (2003). The litho-geochemical framework underlying the geotectonic evolution of the Kazaure Schist Belt, NW Nigeria. The Nigerian Journal of Scientific Research, 4(1), pp. 1-13.

[18] Akande, S.O., Fakorede, O. and Mucke, A. (1988). Geology and genesis of gold-bearing quartz veins at Bin Yauri and Okolom in the Pan-African domain of western Nigeria. Geologie en Mijnbouw, 67(1), 41- 51.

[19] Oyinloye, A.O. (1992). Genesis of the Iperindo gold deposit, Ilesha schist belt, southwestern Nigeria. Ph. D Thesis, University of Wales, UK.

[20] Adekoya, J.A. and Oladeji, B.O. (1985). “Geological and Structural Setting of the Muro Hills Banded Iron-Formation, Plateau State, Nigeria,” Journal of Mining and Geology, 22, 161-185.

[21] Muotoh, E.O.G., Oluyide, P.O., Okoro, A.U. and Muogbo, O. (1988). The Muro Hills Banded Iron-Formation. Precambrian Geology of Nigeria (A publication of the Geological Survey), 219.

[22] Adekoya, J.A. (1991). “The Geology of Banded Iron-Formations in the Precambrian Basement Complex of Northern Nigeria,” Ph. D. Dissertation, University of Ibadan, Ibadan.

[23] Adekoya, J.A., Okonkwo, C.T. and Adepoju, M.O. (2012). Geochemistry of Muro Banded Iron-Formation, Central Nigeria, International Journal of Geosciences, 3, 1074-1083

[24] Okunlola, O.A., and Akinola, O.O. (2010). Petrochemical characteristics of the Precambrian rare metal pegmatite of Oke-Asa area, Southwestern Nigeria: Implication for Ta-Nb Mineralization. RMZ-Materials and Geo Environment, 57, 525-538.

[25] Elueze, A.A. and Bolarinwa, A.T. (1995). Assessment of functional application of lateritic clay bodies in Ekiti environs, Southwestern Nigeria. Journal of Mining and Geology, 31(1), 79-87.

[26] Elueze, A.A., and Bolarinwa, A.T. (2001). Appraisal of the residual and sedimentary clays in parts of Abeokuta Area, Southwestern Nigeria. Journal of Mining and Geology, 37(1), 7-14.

[27] Akinyemi, S.A., Ogunniyi, S.O., Ojo, A.O., Gitari, W.M., Momoh, A., Akinola, O.O., Talabi, A.O., Afolagboye, L.O., Olaolorun, O.A. and Ayodele, O.S. (2014). Mineralogy, Physicochemical Characteristics and Industrial Potential of Some Residual Clay Deposits within Ekiti State, Southwestern Nigeria. Journal of Environment and Earth Science, 4(17).

[28] Lindqvist J.E.A., Kesson, U. and Malaga, K. (2007). Microstructure and functional properties of rock materials. Mater Character, 58(11-12):1183-1188.

[29] Arif M., Bukhari, S.W.H., Muhammad, N. and Sajid, M. (2013). petrography and physico-mechanical properties of rocks from the Ambela granitic complex, NW Pakistan. Sciences World Journal, 1-8.

[30] Afolagboye, L.O., Talabi, A.O. and Akinola, O.O. (2015). “Evaluation of selected basement complex rocks from Ado-Ekiti, SW Nigeria, as source of road construction aggregates” Bulletin of Engineering Geology and Environment, 75(2) 853-865.

[31] GSN (1974). Geological Survey of Nigeria, Geological Map of Nigeria 1:2,000,000; Published by Geological Survey of Nigeria (GSN) Geological Survey Sheet 51, Akure, SW Nigeria.

[32] Obaje, S.O., Omada, J.I., and Dambatta, U.A. (2013). Clays and their industrial applications: Synoptic Review, International Journal of Science and Technology, 3(5), 264-270.

[33] Murray, H.H. (1960). Clay industrial materials and rocks, 3rd Ed., Publication of American Institute of Mining, Metallurgy and Petroleum Engineering, New York, Seeley, W. Mudd Series, 259-284.

[34] Emofurieta, W.O., Kayode, A.A. and Coker, S.A. (1992). Mineralogy, geochemistry, and economic evaluation of the kaolin deposits near Ubulu-Uku, Awo-Omama and Buan in Southern Nigeria, Journal of Mining and Geology, 28, 211-220.

[35] Onyeobi, T.U.S., Imeokparia, E.G.O., Ilegieuno, A. and Egbuniwe, I.G. (2013). Compositional, Geotechnical and Industrial Characteristics of Some Clay Bodies in Southern Nigeria. Journal of Geography and Geology, 5(2), 73-84.



DOI: https://doi.org/10.30564/jees.v3i2.3308

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