DEFORMATION MECHANISMS, TIMING AND SHEAR SENSE ANALYSIS OF PART OF THE PRECAMBRIAN TERRAIN OF SOUTHWESTERN NIGERIA.
DOI:
https://doi.org/10.4314/jfas.v11i1.11Keywords:
Shear; deformation; tectonic; poikiloblast; rotation; isoclines.Abstract
The study area is part of the polycyclic Precambrian Basement Complex of southwestern Nigeria, which comprises meta-sediments and granitoids of varying compositions. The area was primarily deformed into a large-scale sheeted structure, which was sequentially followed by developments of first and second phases of folding that interfered with each other. Brittle to semi-ductile shear deformations, initiated by an ESE-directed transport of the hanging wall of a major NE-SW trending low-angle normal fault culminated in the third phase of fold and development of widespread shear zones. Latter phases of deformation resulted in rotation of finite strain axis relative to the instantaneous strain during a non-coaxial progressive simple shear deformation. We posit that the dominant terminal mechanism of deformation in the area is the late-kinematic progressive heterogeneous simple shear during the late- to post-Pan African orogenesis.
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References
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[15] Adedoyin, A.D., Adekeye, J.I.D., Ojo, O.J., Bamigboye, O.S.,and Ajayi, M.T. (2012) Oke-Ode Dome - A product of interference followed by shearing. Scottish Journal of Arts, Social Sciences and Scientific Studies, 12(II):100-107.
[16] Adedoyin, A.D., Bamigboye, O.S., Adekeye, J.I.D. and OjO, O.J. (2013a). Ductile shearing and remobilization of porphyritic granite in Koro-Egbe area, southwestern Nigeria. Science Focus, 18(1):73-77.
[17] Ajadi, J. (2008). Geology, geochemistry and origin of the gold mineralization in the Bishewa area, central Nigeria. Unpublished M.Sc. Thesis, Univ. Ilorin, Nigeria. 129pp.
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[19] Omosanya, K.O., Akinbodewa, A. E., Mosuro, G.O. and Kaigama, U. (2013).Alteration of σ3 field during the evolution of a polycyclic basement complex. Journal of Geology and Mining Research. 5 (2) :23-37.
[20] Affaton, P., Rahaman, M.A., Trompetts, R. and Sougy, J. (1991). The Dahomeyide Orogeny: tectonothermal evolution and relationships with the Volta basin. In: Dallmeyer, R.D. and Lecorche, J.F. (eds,) The West African orogens and Circum Atlantic Correlatives. IUGS/UNESCO project 233. Springer Berlin, Heildelberg, New York, pp107-122.
[21] Cees Paschier and Sara Coelho (2006). An outline of shear-sense analysis in high-grade rocks. Gondwana Research. 10 (1 and 2); 66-76.
[22] Lisle, R.J. (2012).Shear zone deformation determined from sigmoidal tension gashes. J. Struct, Geol. 50:35-43.
[23] Dada, S.S., Goki, N., Oha, I.andAjadi, J. Geotectonic, geomorphic and economic features of Okegbala-Oreke Quuartzite ridge, West central Nigeria. Abstract. 52nd Annual International Conference and xhibitions of the Nigerian Mining and Geosciences Society. 2016, 88.
Geology, 27:1229-1251.
[24] Holt, R., Egbuniwe, I.G. Fitches, W. R. and Wright, J. B. (1978). The relationships between the Low-grade metasedimentary belts, calc-alkaline volcanisms and the Pan African orogeny in NW Nigeria. Geol. Rundschau., 67 (2):631-646.
[25] Agrawal, S. (1995). Discrimination between late-orogenic, post-orogenic and anorogenic granites by major element compositions. Journal of Geology, 103:529-557.
[26] Johnson, S.E. and Bell, T.H. (1996). How useful are ‘millipede’ and other similar porphyroblasts microstructures for determining syn-metamorphic deformation histories? Journal of Metamorphic Geology, 14:15-28.
[27] Carreras, J., Druguet, E. and Griera, A. (2005). Shearzone –related folds. Juornal of Structural Geology 27:1229-1251.
[28] ExxonMobil/AAPG/NAPE short course on Structural Geology, (June 27- July 1, 2016), Dover Hotel, Olubunmi Owa St, Lekki Phase I, Lagos. (Lecturer: Prof. Terry Engelder, Penn State University).
[2] Dada, S.S. (2006). Proterozoic evolution of Nigeria. In: Oshin, O. (ed). The Basement Complex of Nigeria and its Mineral Resources (A Tribute to Prof. M. A. Rahaman).Akin Jinad& Co. Ibadan, P29–44.
[3] Dada, S S. (2008). Proterozoic evolution of the Nigerian-Boborema province. Geological Society, London, Special publications 294:121-136.
[4] Okonkwo, C.T.(2006). Pan-African Faulting lnJebba area, Southwestern Nigeria. In: Oshi, O (ed). The Basement Complex of Nigeria and its Mineral Resources (A Tribute to Prof. M. A. Rahaman).Akin Jinad& Co. Ibadan. P 71-86.
[5] Adedoyin, A.D. and Ojo, O.J. (2016): Re-orientation of a NE-SW F1 fold during a retrograde F2 deformation in Southwestern Nigeria: Further signature of Pan-African tangential deformation. Proceedings of the 2016 Faculty of Science International Conference; Federal University, Oye-Ekiti, Nigeria.
[6] Paschier, C.W. and Trouw, R.A.J. (2005). Microtectonics. 2nd Ed. Springer -Verlag, Berlin, 366pp.
[7] Adedoyin, A.D., Adekeye, J.I.D. and Ojo, O.J. (2014): Geochemical composition and Petrogenesis of Schists and Amphibolites of parts of Sheets 203 (Lafiagi) SW and 224 (Osi) NW, South-western Nigeria. Ilorin Journal of Science. 1(1): 1-17. Published by Faculty of Physical Science, University of Ilorin. www.unilorin.edu.ng/ejournals/index.php/ILJS
[8] Adedoyin, A.D., Ojo, O.J., Adekeye, J.I.D. and Alebiosu, M.T. (2017): Geochemical Assessments of Owa-Kajola Marble, Soth-western Nigeria. NSUK Journal of Science and Technology, Volume (1/2) Accepted 05/04/2017.
[9] McCurry. P. (1971). Pan African Orogeny in Northern Nigeria. Geological Society of America Bulletin, 82: 3252-3262.
[10] Rahaman, M.A. (1976). Review of the basement geology of soutwestern Nigeria. In: Geology of Nigeria (C.A. Kogbe, ed.). Elizabethan Publishing Company, Lagos. P41-58.
[11] Rahaman, M.A. (1988). Recent advances in the study of the Basement Complex of Nigeria. In: Oluyide,P.O., Mbonu, W.C., Ogezi, A.E., Egbuniwe, I.G, Ajibade, A.C. and Umeji, A.C. (eds). Precambrian Geology of Nigeria, Geological Survey of Nigeria Report.
[12] Rahaman, M.A. (2004). Nigeria’s Mineral Endowment and Sustainable development. 2nd Mosobalaje Oyawoye Faculty of Science Lecture in Geology. University of Ilorin, Nigeria.
[13] Annor, A.E. and Freeth, S.J. (1985). Thermo-tectonic evolution of the Basement Complex around Okene, Nigeria; with special references to deformation mechanism. Precambrian Research, 28:73-77.
[14] Annor, A.E. (1986). A structural classification of the Precambrian Basement Complex of Nigeria. Journal of Applied Sciences, 21: 84-89.
[15] Adedoyin, A.D., Adekeye, J.I.D., Ojo, O.J., Bamigboye, O.S.,and Ajayi, M.T. (2012) Oke-Ode Dome - A product of interference followed by shearing. Scottish Journal of Arts, Social Sciences and Scientific Studies, 12(II):100-107.
[16] Adedoyin, A.D., Bamigboye, O.S., Adekeye, J.I.D. and OjO, O.J. (2013a). Ductile shearing and remobilization of porphyritic granite in Koro-Egbe area, southwestern Nigeria. Science Focus, 18(1):73-77.
[17] Ajadi, J. (2008). Geology, geochemistry and origin of the gold mineralization in the Bishewa area, central Nigeria. Unpublished M.Sc. Thesis, Univ. Ilorin, Nigeria. 129pp.
[18] Adekeye, J.I.D., Ajadi, J., Adedoyin, A.D., Bamigboye, O.S. and Alabi, A.G.F. (2016): Origin and structural control of gold mineralization in Bishewa area, central Nigeria. Centrepoint Journal. 21 (1): 13-34. Published by Library and Publications Committee, University of Ilorin, Nigeria.
[19] Omosanya, K.O., Akinbodewa, A. E., Mosuro, G.O. and Kaigama, U. (2013).Alteration of σ3 field during the evolution of a polycyclic basement complex. Journal of Geology and Mining Research. 5 (2) :23-37.
[20] Affaton, P., Rahaman, M.A., Trompetts, R. and Sougy, J. (1991). The Dahomeyide Orogeny: tectonothermal evolution and relationships with the Volta basin. In: Dallmeyer, R.D. and Lecorche, J.F. (eds,) The West African orogens and Circum Atlantic Correlatives. IUGS/UNESCO project 233. Springer Berlin, Heildelberg, New York, pp107-122.
[21] Cees Paschier and Sara Coelho (2006). An outline of shear-sense analysis in high-grade rocks. Gondwana Research. 10 (1 and 2); 66-76.
[22] Lisle, R.J. (2012).Shear zone deformation determined from sigmoidal tension gashes. J. Struct, Geol. 50:35-43.
[23] Dada, S.S., Goki, N., Oha, I.andAjadi, J. Geotectonic, geomorphic and economic features of Okegbala-Oreke Quuartzite ridge, West central Nigeria. Abstract. 52nd Annual International Conference and xhibitions of the Nigerian Mining and Geosciences Society. 2016, 88.
Geology, 27:1229-1251.
[24] Holt, R., Egbuniwe, I.G. Fitches, W. R. and Wright, J. B. (1978). The relationships between the Low-grade metasedimentary belts, calc-alkaline volcanisms and the Pan African orogeny in NW Nigeria. Geol. Rundschau., 67 (2):631-646.
[25] Agrawal, S. (1995). Discrimination between late-orogenic, post-orogenic and anorogenic granites by major element compositions. Journal of Geology, 103:529-557.
[26] Johnson, S.E. and Bell, T.H. (1996). How useful are ‘millipede’ and other similar porphyroblasts microstructures for determining syn-metamorphic deformation histories? Journal of Metamorphic Geology, 14:15-28.
[27] Carreras, J., Druguet, E. and Griera, A. (2005). Shearzone –related folds. Juornal of Structural Geology 27:1229-1251.
[28] ExxonMobil/AAPG/NAPE short course on Structural Geology, (June 27- July 1, 2016), Dover Hotel, Olubunmi Owa St, Lekki Phase I, Lagos. (Lecturer: Prof. Terry Engelder, Penn State University).
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Published
2018-12-06
How to Cite
ADEDOYIN, A. D.; EBIRI, E. P.; ALEBIOSU, M. T. DEFORMATION MECHANISMS, TIMING AND SHEAR SENSE ANALYSIS OF PART OF THE PRECAMBRIAN TERRAIN OF SOUTHWESTERN NIGERIA. Journal of Fundamental and Applied Sciences, [S. l.], v. 11, n. 1, p. 154–172, 2018. DOI: 10.4314/jfas.v11i1.11. Disponível em: https://jfas.info/index.php/JFAS/article/view/61. Acesso em: 9 oct. 2025.
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