South of Godé, in the central-western region of
Burkina Faso, granitoids of Paleoproterozoic
age are similar to those of the Man/Leo shield. This study focused on the
petrographic and geochemical characteristics of these granitoids, with the
following results: 1) The tonalite that outcrops in the south-west of the study area belongs to the TTG group or first generation
granitoids. They are most often ribboned at
outcrop and have a geochemical signature close to that of Archean TTGs.
Tonalite has a metaluminous character and the REE spectrum indicates
that it may be derived from partial melting of basic magmatic rocks. 2)
Biotite granites have no outcrop structure. They are weakly metaluminous to
peraluminous and potassic to highly potassic. Their rare earth spectra indicate that they may be derived from
the partial melting of TTG granitoids. 3) Geotectonic diagrams show that the granitoids
studied to the south of Godé were emplaced in an active tectonic context
similar to that of present-day subduction zones.
References
[1]
Castaing, C., Billa, M., Milési, J.P., Thiéblemont, D., Le Métour, J., Egal, E., Donzeau, M., Guerrot, C., Cocherie, A., Chèvremont, P., Tegyey, M., Itard, Y., Zida, B., Ouédraogo, I., Koté, S., Kaboré, B.E., Ouédraogo, C., Ki, J.C. and Zunino, C. (2003) Notice explicative de la carte géologique et minière du Burkina Faso à 1/1 000 000. Edit. B.R.G.M., Orléans, 147.
[2]
Kagambèga, N. (2005) Typologie des granitoïdes paléoprotérozoïques (Birimien) du Burkina Faso-Afrique de l’Ouest: Approche pétrologique dans la région de Pô. Thèse, Université Cheick Anta Diop de Dakar, Dakar, 192 p.
[3]
Naba, S. (2007) Propriétés magnétiques et caractères structuraux des granites du Burkina Faso oriental (Craton Ouest Africain, 2,2-2,0 Ga): Implications géodynamiques. Thèse, Université de Toulouse-Paul SABATIER, Toulouse, 175 p.
[4]
Tapsoba, B., Lo, C.-H., Jahna, B.-M., Chunga, S.-L., Wenmenga, U. and Iizuka, Y. (2013) Chemical and Sr-Nd Isotopic Compositions and Zircon U-Pb Ages of the Birimian Granitoids from NE Burkina Faso, West African Craton: Implications on the Geodynamic Setting and Crustal Evolution. Precambrian Research, 224, 364-396. https://doi.org/10.1016/j.precamres.2012.09.013
[5]
Tshibubudze, A. and Hein, K.A.A. (2013) Structural Setting of Gold Deposits in the Oudalan-Gorouol Volcano-Sedimentary Belt East of the Markoye Shear Zone, West African Craton. Journal of African Earth Sciences, 80, 31-47. https://doi.org/10.1016/j.jafrearsci.2012.11.010
[6]
Naba, S., Lompo, M., Debat, P., Bouchez, J.L. and Beziat, D. (2004) Structure and Emplacement Model for Late-Orogenic Paleoproterozoic Granitoids: Tenkodogo-Yamba Elongate Pluton (Eastern Burkina Faso). Journal of African Earth Sciences, 38, 41-57. https://doi.org/10.1016/j.jafrearsci.2003.09.004
[7]
Yaméogo, A.O., Naba, S. and Traoré, S.A. (2020) Caractères pétrographiques et géochimiques des granitoïdes de la région de Dori au nord-est du Burkina Faso, Craton Ouest Africain. Afrique Science, 16, 375-395.
[8]
Pawlig, S., Gueye, M., Klischies, R., Schwarz, S., Wemmer, K. and Siegesmund, S. (2006) Geochemical and Sr-Nd Isotopic Data on the Birimian of the Kedougou-Kenieba Inlier (Eastern Senegal): Implications on the Paleoproterozoic Evolution of the West African Craton. South African Journal of Geology, 109, 411-427. https://doi.org/10.2113/gssajg.109.3.411
[9]
Sylvester, P.J. and Attoh, K. (1992) Lithostratigraphy and Composition of 2.1 Ga Greenstone Belts of the West African Craton and Their Bearing on Crustal Evolution and the Archean-Proterozoic Boundary. The Journal of Geology, 100, 377-393. https://doi.org/10.1086/629593
[10]
Ama Salah, I., Liegeois, J.P. and Pouclet, A. (1996) Evolution d’un arc insulaire oceanique birimien precoce au Liptako Nigerien (Siriba): Geologie, geochronologie et geochimie. Journal of African Earth Sciences, 22, 235-254. https://doi.org/10.1016/0899-5362(96)00016-4
[11]
Beziat, D., Bourges, F., Debat, P., Lompo, M., Martin, F. and Tollon, F. (2000) A Paleoproterozoic Ultramafic-Mafic Assemblage and Associated Volcanic Rocks of the Boromo Greenstone Belt: Fractionates Originating from Island-Arc Volcanic Activity in the West African Craton. Precambrian Research, 101, 25-47. https://doi.org/10.1016/S0301-9268(99)00085-6
[12]
Soumaila, A., Henry, P. and Rossy, R. (2004) Contexte de mise en place des roches basiques de la ceinture de roches vertes birimienoe de Diagorou-Darbani (Liptako, Niger, Afrique de l’Ouest): Plateau océanique ou environnement d’arc/bassin arrièrearc océanique. Comptes Rendus Geoscience, 336, 1137-1147. https://doi.org/10.1016/j.crte.2004.03.008
[13]
Dampare, S.B., Shibata, T., Asiedu, D.K., Osae, S. and Banoeng-Yakubo, B. (2008) Geochemistry of Paleoproterozoic Metavolcanic Rocks from the Southern Ashanti Volcanic Belt, Ghana: Petrogenetic and Tectonic Setting Implications. Precambrian Research, 162, 403-423. https://doi.org/10.1016/j.precamres.2007.10.001
[14]
Abouchami, W., Boher, M., Michard, A. and Albarède, F. (1990) A Major 2.1 Ga Old Event of Mafic Magmatism in West Africa: An Early Stage of Crustal Accretion. Journal of Geophysical Research, 95, 17605-17629. https://doi.org/10.1029/JB095iB11p17605
[15]
Boher, M., Abouchami, W., Michard, A., Albarède, F. and Arndt, T.N. (1992) Crustal Growth in West Africa at 2.1 Ga. Journal of Geophysical Research, 97, 345-369. https://doi.org/10.1029/91JB01640
[16]
Pouclet, A., Doumbia, S. and Vidal, M. (2006) Geodynamic Setting of the Birimian Volcanism in Central Ivory Coast (Western Africa) and Its Place in the Palaeoproterozoic Evolution of the Man Shield. Bulletin de la Societe Geologique de France, 167, 529-541. https://doi.org/10.2113/gssgfbull.177.2.105
[17]
Lompo, M. (2009) Geodynamic Evolution of the 2.25-2.0 Ga Palaeoproterozoic Magmatic Rocks in the Man-Leo Shield of the West African Craton. A Model of Subsidence of an Oceanic Plateau. Geological Society, London, Special Publications, 323, 231-254. https://doi.org/10.1144/SP323.11
[18]
Harker, A. (1909) The Natural History of Igneous Rocks. Methuen and Co., London, and Macmillan, New York, 377 p.
[19]
Peccerillo, A. and Taylor, S.R. (1976) Geochemistry of Eocene Talc-Alkaline Volcanic Rocks from the Kastamonu Area, Northern Turkey. Contributions Mineralogy Petrology, 58, 63-81. https://doi.org/10.1007/BF00384745
[20]
Sun, S.S. and McDonough, W.F. (1989) Chemical and Isotopic Systematics of Oceanic Basalts: Implications for Mantle Composition and Processes. In: Saunders, A.D. and Norry, M.J., Eds., Magmatism in the Ocean Basins, Geological Society, London, Special Publications, 313-345. https://doi.org/10.1144/GSL.SP.1989.042.01.19
[21]
Batchelor, B. and Bowden, P. (1985) Petrogenetic Interpretation of Granitoid Rock Series Using Multicationic Parameters. Chemical Geology, 48, 43-55. https://doi.org/10.1016/0009-2541(85)90034-8
[22]
Pearce, J.A. (2008) Geochemical Fingerprinting of Oceanic Basalts with Applications to Ophiolite Classification and the Search for Archean Oceanic Crust. Lithos, 100, 14-48. https://doi.org/10.1016/j.lithos.2007.06.016
[23]
Ilboudo, H., Sawadogo, S., Kagambega, N. and Remmal, R. (2021) Petrology, Geochemistry, and Source of the Emplacement Model of the Paleoproterozoic Tiébélé Granite Pluton, Burkina Faso (West-Africa): Contribution to Mineral Exploration. International Journal of Earth Sciences, 110, 1753-1781. https://doi.org/10.1007/s00531-021-02039-3
[24]
Block, S., Baratoux, L., Zeh, A., Laurent, O., Bruguier, O., Jessell, M.W., Ailleres, L., Sagna, R., Parra-Avila, L.A. and Bosch, D. (2016) Paleoproterozoic Juvenile Crust Formation and Stabilisation in the South-Eastern West African Craton (Ghana); New Insights from U-Pb-Hf Zircon Data and Geochemistry. Precambrian Research, 287, 1-30. https://doi.org/10.1016/j.precamres.2016.10.011
[25]
Kagambega, N., Lompo, M., Naba, S., et al. (2006) Caractère magmatique des granitoïdes rubanés de Pô (Burkina Faso-Afrique de l’Ouest): Problème des migmatites paléoprotérozoïques. Annales de l’Université de Ouagadougou-Série C, 4, 1-24.
[26]
Sourgou, O., Yameogo, A.O., Ilboudo, H., Traore, A.S. and Naba, S. (2022) Contraintes pétrographiques et géochimiques des leptynites de Kombissiri dans le Centre-Sud du Burkina Faso (Afrique de l’Ouest). Bulletin de l’Institut Scientifique, Rabat, Section Sciences de la Terre, No. 44, 105-115.
[27]
Vidal, M., Gumiaux, C., Cagnard, F., et al. (2009) Evolution of a Paleoproterozoic “Weak Type” Orogeny in the West African Craton (Ivory Coast). Tectonophysics, 477, 145-159. https://doi.org/10.1016/j.tecto.2009.02.010
[28]
Lompo, M. (2010) Paleoproterozoic Structural Evolution of the Man-Leo Shield (West Africa). Key Structures for Vertical to Transcurrent Tectonics. Journal of African Earth Sciences, 58, 19-36. https://doi.org/10.1016/j.jafrearsci.2010.01.005
