The Dialafara area is part of the highly endowed Kédougou-Kéniéba Inlier (KKI), West-Malian gold belt, which corresponds to a Paleoproterozoic window through the West African Craton (WAC). This study presents, first of all, an integration of geophysical data interpretation with litho-structural field reconnaissance and then proposes a new litho-structural map of the Dialafara area. The Dialafara area shows a variety of lithology characterized by volcanic and volcano-sedimentary units, metasediments and plutonic intrusion. These lithologies were affected by a complex superposition of structures of unequal importance defining three deformation phases (D D1 to D D3 ) under ductile to brittle regimes. These features permit to portray a new litho-structural map, which shows that the Dialafara area presents a more complex lithological and structural context than the one presented in regional map of the KKI. This lead s to the evidence that this area could be a potential site for exploration as it is situated between two world-class gold districts.
Goldfarb, R.J., André-Mayer, A.S., Jowitt, S.M. and Mudd, G.M. (2017) West Africa: The World’s Premier Paleoproterozoic Gold Province. Economic Geology, 112, 123-143. https://doi.org/10.2113/econgeo.112.1.123
Bonhomme, M. (1962) Contribution à l’étude géochronologique de la plate-forme de l’Ouest africain. Imprimerie Louis-Jean, Québec.
Milési, J.P., Ledru, P., Feybesse, J.L., Dommanget, A. and Marcoux, E. (1992) Early Proterozoic Ore Deposits and Tectonics of the Birimian Orogenic Belt, West Africa. Precambrian Research, 58, 305-344. https://doi.org/10.1016/0301-9268(92)90123-6
Liégeois, J.P., Claessens, W., Camara, D. and Klerkx, J. (1991) Short-Lived Eburnian Orogeny in Southern Mali. Geology, Tectonics, U-Pb and Rb-Sr Geochronology. Precambrian Research, 50, 111-136. https://doi.org/10.1016/0301-9268(91)90050-K
Feybesse, J.L., Billa, M., Guerrot, C., Duguey, E., Lescuyer, J.L., Milesi, J.P. and Bouchot, V. (2006) The Paleoproterozoic Ghanaian Province: Geodynamic Model and Ore Controls, Including Regional Stress Modeling. Precambrian Research, 149, 149-196. https://doi.org/10.1016/j.precamres.2006.06.003
Vanderhaeghe, O. and Teyssier, C. (2001) Partial Melting and Flow of Orogens. Tectonophysics, 342, 451-472. https://doi.org/10.1016/S0040-1951(01)00175-5
Choukroune, P., Ludden, J.N., Chardon, D., Calvert, A.J. and Bouhallier, H. (1997) Archaean Crustal Growth and Tectonic Processes: A Comparison of the Superior Province, Canada and the Dharwar Craton, India. Geological Society Special Publications, 121, 63-98. https://doi.org/10.1144/GSL.SP.1997.121.01.04
Gueye, M., Ngom, P.M., Diène, M., Thiam, Y., Siegesmund, S., Wemmer, K. and Pawlig, S. (2008) Intrusive Rocks and Tectono-Metamorphic Evolution of the Mako Paleoproterozoic Belt (Eastern Senegal, West Africa). Journal of African Earth Sciences, 50, 88-110. https://doi.org/10.1016/j.jafrearsci.2007.09.013
Goldfarb, R.J., Phillips, G.N. and Nokleberg, W.J. (1998) Tectonic Setting of Syn-Orogenic Gold Deposits of the Pacific Rim. Ore Geology Reviews, 13, 185-218. https://doi.org/10.1016/S0169-1368(97)00018-8
Groves, D.I., Santosh, M., Goldfarb, R.J. and Zhang, L. (2018) Structural Geometry of Orogenic Gold Deposits: Implications for Exploration of World-Class and Giant Deposits. Geoscience Frontiers, 9, 1163-1177. https://doi.org/10.1016/j.gsf.2018.01.006
Kusnir, I. (1991) Gold in Mali. Acta Montanistica Slovaca, 4, 311-318.
Milési, J.P., Heinry, C. and Sylvain, J.P. (1989) Minéralisations aurifères de l’Afrique de l’ouest leurs relations avec l’évolution lithostructurale au Proterozoique inférieur. Bureau de recherches géologiques et minières, Orléans.
Gunn, P.J., Maidment, D. and Milligan, P.R. (1997) Interpreting Aeromagnetic Data in Areas of Limited Outcrop. AGSO Journal of Australian Geology & Geophysics, 17, 175-185.
Hansen, R.O. (2001) Gravity and Magnetic Methods at the Turn of the Millennium. Geophysics, 66, 36-37. https://doi.org/10.1190/1.1444915
Metelka, V., Baratoux, L., Jessell, M.W., Barth, A., Ježek, J. and Naba, S. (2018) Automated Regolith Landform Mapping Using Airborne Geophysics and Remote Sensing Data, Burkina Faso, West Africa. Remote Sensing of Environment, 204, 964-978. https://doi.org/10.1016/j.rse.2017.08.004
Pereira, L.C.L., De Lira Santos, L.C.M. and Carrino, T.A. (2019) The Role of Airborne Geophysics in the Investigation of Gold Occurrences in the Itapetim Region, Borborema Province, Northeast Brazil. Brazilian Journal of Geology, 49, e20190028. https://doi.org/10.1590/2317-4889201920190028
Hirdes, W. and Davis, D.W. (2002) U–Pb Geochronology of Paleoproterozoic Rocks in the Southern Part of the Kedougou-Kenieba Inlier, Senegal, West Africa: Evidence for Diachronous Accretionary Development of the Eburnean Province. Precambrian Research, 118, 83-99. https://doi.org/10.1016/S0301-9268(02)00080-3
Dia, A., Van Schmus, W.R. and Kröner, A. (1997) Isotopic Constraints on the Age and Formation of a Palaeoproterozoic Volcanic Arc Complex in the Kédougou Inlier, Eastern SENEGAL, West Africa. Journal of African Earth Sciences, 24, 197-213. https://doi.org/10.1016/S0899-5362(97)00038-9
Dioh, E., Béziat, D., Debat, P., Grégoire, M. and Ngom, P.M. (2006) Diversity of the Palaeoproterozoic Granitoids of the Kédougou Inlier (Eastern Senegal): Petrographical and Geochemical Constraints. Journal of African Earth Sciences, 44, 351-371. https://doi.org/10.1016/j.jafrearsci.2005.11.024
Bassot, J.P. (1987) Le complexe volcano-plutonique calco-alcali de la riviere dalema (Est Senegal): Discussion de sa signification geodynamique dans le cadre de l’orogenie eburneenne (proterozoique inferieur). Journal of African Earth Sciences (1983), 6, 505-519. https://doi.org/10.1016/0899-5362(87)90091-1
Schwartz, M.O. and Melcher, F. (2004) The Falémé iron district, Senegal. Economic Geology, 99, 917-939. https://doi.org/10.2113/gsecongeo.99.5.917
Lambert-Smith, J.S., Lawrence, D.M., Vargas, C.A., Boyce, A.J., Treloar, P.J. and Herbert, S. (2016) The Gounkoto Au deposit, West Africa: Constraints on Ore Genesis and Volatile Sources from Petrological, Fluid Inclusion and Stable Isotope Data. Ore Geology Reviews, 78, 606-622. https://doi.org/10.1016/j.oregeorev.2015.10.025
Bassot, J.P. (1966) étude géologique du Sénégal oriental et de ses confins guinéo-maliens... éditions BRGM, Paris.
Koné, J., Vanderhaeghe, O., Diatta, F., Baratoux, L., Thébaud, N., Bruiguier, O., Ndiaye, P.M., Duchene, S., Pitra, P. and Ganne, J. (2020) Source and Deposition Age of the Dialé-Daléma Metasedimetary Series (Kédougou-Kénieba Inlier, Senegal) Constrained by U-Pb Geochronology on Detrital Zircons. Journal of African Earth Sciences, 165, Article ID: 103801. https://doi.org/10.1016/j.jafrearsci.2020.103801
Pons, J., Oudin, C. and Valero, J. (1992) Kinematics of Large Syn-Orogenic Intrusions: Example of the Lower Proterozoic Saraya Batholith (Eastern Senegal). Geologische Rundschau, 81, 473-486. https://doi.org/10.1007/BF01828610
Masurel, Q., Thébaud, N., Miller, J. and Ulrich, S. (2017) The Tectono-Magmatic Framework to Gold Mineralisation in the Sadiola-Yatela Gold Camp and Implications for the Paleotectonic Setting of the Kédougou-Kénieba Inlier, West Africa. Precambrian Research, 292, 35-56. https://doi.org/10.1016/j.precamres.2017.01.017
Allibone, A., Lawrence, D., Scott, J., Fanning, M., Lambert-Smith, J., Stenhouse P., Harbidge, R., Vargas, C., Rose Turnbull, R. and Holliday, J. (2020) Early Paleoproterozoic Gold Deposits of the Loulo District, Western Mali. In: Sillitoe, R.H., Goldfarb, R.J., Robert, F. and Simmons, S.F., Eds., Geology of the World’s Major Gold Deposits and Provinces, Society of Economic Geologists, Littleton, 141-162. https://doi.org/10.5382/SP.23.07
Ledru, P., Pons, J., Milési, J.P., Feybesse, J.L. and Johan, V. (1991) Transcurrent Tectonics and Polycyclic Evolution in the Lower Proterozoic of Senegal-Mali. Precambrian Research, 50, 337-354. https://doi.org/10.1016/0301-9268(91)90028-9
Diene, M., Gueye, M., Diallo, D.P. and Dia, A. (2012) Structural Evolution of a Precambrian Segment: Example of the Paleoproterozoic Formations of the Mako Belt (Eastern Senegal, West Africa). International Journal of Geosciences, 3, 153-165. https://doi.org/10.4236/ijg.2012.31017
Diallo, M., Lenka, B., Dufréchou, G., Jessel, M.W., Vanderhaeghe, O., Ly, S. and Baratoux, D. (2020) Structure of the Paleoproterozoic Kédougou-Kéniéba Inlier (Senegal-Mali) Deduced from Gravity and Aeoromagnetic Data. Journal of African Earth Sciences, 162, Article ID: 103732. https://doi.org/10.1016/j.jafrearsci.2019.103732
Bassot, J.P. and Dommanget, A. (1986) Mise en évidence d’un accident majeur affectant le Protérozoïque inférieur des confins sénégalo-maliens. Comptes rendus hebdomadaires des séances de l’Académie des sciences, 302, 1101-1106.
Boyd, D.M. and Isles, D.J. (2007) Geological Interpretation of Airborne Magnetic Surveys-40 Years on. Proceedings of Exploration 07: Fifth Decennial International Conference on Mineral Exploration, Toronto, 9-12 September 2007, 491-505.
Koné, A.Y., Nasr, I.H., Traoré, B., Amiri, A., Inoubli, M.H., Sangaré, S. and Qaysi, S. (2021) Geophysical Contributions to Gold Exploration in Western Mali according to Airborne Electromagnetic Data Interpretations. Minerals, 11, Article 126. https://doi.org/10.3390/min11020126
Sysmin (2006) Projet de cartographie du Birimien malien. BRGM/RC-54684-FR.
McLeod, I.N., Jones, K. and Dai, T.F. (1993) 3-D Analytic Signal in the Interpretation of Total Magnetic Field Data at Low Magnetic Latitudes. Exploration Geophysics, 24, 679-687. https://doi.org/10.1071/EG993679