M. G. Abdelsalam, J. P. Liégeois, and R. J. Stern, The Saharan Metacraton, Journal of African Earth Sciences, vol.34, issue.3-4, pp.119-136, 2002.
DOI : 10.1016/S0899-5362(02)00013-1

R. A. Agar, The tectono-metallogenic evolution of the arabian shield, Precambrian Research, vol.58, issue.1-4, pp.169-194, 1992.
DOI : 10.1016/0301-9268(92)90118-8

B. Bessoles and R. Trompette, Géologie de l'Afrique. La chaîne panafricaine ''«zone mobile d'Afrique centrale»'', (partie sud) et zone soudanaise, Mémoire BRGM, vol.92, p.394, 1980.

R. Black and J. Liegeois, Cratons, mobile belts, alkaline rocks and continental lithospheric mantle: the Pan-African testimony, Journal of the Geological Society, vol.150, issue.1, pp.89-98, 1993.
DOI : 10.1144/gsjgs.150.1.0088

R. Caby, Precambrian terrane of Benin-Nigeria and Northeast Brazil and Proterozoic Atlantic, Geol. Soc. Am., sp. paper, vol.230, pp.145-158, 1989.

C. Castaing, J. Feybesse, D. Thiéblement, C. Triboulet, and P. Chèvremont, Palaeogeographical reconstructions of the Pan-African/Brasiliano orogen: closure of an oceanic domain or intracontinental convergence between major blocks?, Precambrian Research, vol.69, issue.1-4, pp.327-344, 1994.
DOI : 10.1016/0301-9268(94)90095-7

J. B. Chaussier, Carte minérale du Tchad & notice. Rapport inédit 68p. Direction Mines Géologie, 1970.

M. C. Daly, Crustal shear zones in central Africa: a kinematic approach to Proterozoic tectonics, Episodes, vol.11, pp.5-11, 1988.

D. Marambaye, Contexte géologique, typologie des gisements de l'or de Pala (Sud Ouest du Tchad) et impacts socio-environnementaux liés à leur exploitation artisanale, 2011.

M. Djekoundam, Géologie et Potentiel Minier du Tchad, 1995.

L. Dorbath, C. Dorbath, G. Stuart, and D. Fairhead, Structure de la croûte sous le plateau de l'Adamoua (Cameroun) Comptes Rendus de l'Académie des Sciences, pp.539-542, 1984.

J. C. Doumnang, La géologie des formations néoprotérozoïques du Mayo Kebbi, p.234, 2006.

B. N. Ekwueme and A. Kröner, Single zircon evaporation ages from the Oban Massif, southeastern Nigeria, Journal of African Earth Sciences, vol.26, issue.2, pp.195-205, 1998.
DOI : 10.1016/S0899-5362(98)00005-0

E. Ferré, G. Gleïzes, and R. Et-caby, Obliquely convergent tectonics and granite emplacement in the Trans-Saharan belt of Eastern Nigeria: a synthesis, Precambrian Research, vol.114, issue.3-4, pp.199-219, 2002.
DOI : 10.1016/S0301-9268(01)00226-1

E. C. Ferré, J. Déléris, J. L. Bouchez, A. U. Lar, and J. J. Peucat, The Pan-African reactivation of Eburnean and Archaean provinces in Nigeria: structural and isotopic data, Journal of the Geological Society, vol.153, issue.5, pp.719-728, 1996.
DOI : 10.1144/gsjgs.153.5.0719

K. Govindaraju and G. Mevelle, Fully automated dissolution and separation methods for inductively coupled plasma atomic emission spectrometry rock analysis. Application to the determination of rare earth elements. Plenary lecture, Journal of Analytical Atomic Spectrometry, vol.2, issue.6, pp.615-621, 1987.
DOI : 10.1039/ja9870200615

K. Govindaraju, G. Mevelle, and C. Chouard, Automated optical emission spectrochemical bulk analysis of silicate rocks with microwave plasma excitation, Analytical Chemistry, vol.48, issue.9, pp.1325-1331, 1976.
DOI : 10.1021/ac50003a018

R. J. Goldfarb, T. Baker, B. Dubé, D. I. Groves, C. J. Hart et al., Distribution, character, and genesis of gold deposits in metamorphic terranes, Economic Geology 100th Anniversary Volume, pp.407-450, 2005.

R. J. Goldfarb, D. I. Groves, and S. Gardoll, Orogenic gold and geologic time: a global synthesis, Ore Geology Reviews, vol.18, issue.1-2, pp.1-75, 2001.
DOI : 10.1016/S0169-1368(01)00016-6

C. J. Hodgson, R. V. Kirkham, W. D. Sinclair, R. I. Thorpe, and . Duke, Mesothermal lode-gold deposits, Mineral deposit modeling. Geological Association of Canada, pp.635-678, 1993.

M. Isseini, A. André-mayer, O. Vanderhaeghe, P. Barbey, and E. Deloule, A-type granites from the Pan-African orogenic belt in south-western Chad constrained using geochemistry, Sr???Nd isotopes and U???Pb geochronology, Lithos, vol.153, pp.39-52, 2012.
DOI : 10.1016/j.lithos.2012.07.014

M. Y. Kasser, Evolution précambrienne de la region de Mayo Kebbi (Tchad), un segment de la chaîne panfricaine, Thèse de Doctorat au Muséum National d'Histoire Naturelle de Paris, p.217, 1995.

L. V. Kuleshevicha and V. N. Furman, The Taloveis Gold Deposit in the Precambrian Kostomuksha Greenstone Belt, Karelia. Geology of Ore Deposits 51, pp.1-51, 2009.

I. Kusnir, Minéralisation de l'or dans le Mayo Kebbi, p.20, 1991.

I. Kusnir and H. A. Moutaye, Ressources min??rales du Tchad: une revue, Journal of African Earth Sciences, vol.24, issue.4, pp.549-562, 1997.
DOI : 10.1016/S0899-5362(97)00080-8

J. R. Lang, T. Baker, C. J. Hart, and J. K. Mortensen, An exploration model for intrusion-related gold systems, SEG. Newsl, vol.40, issue.1, pp.6-15, 2000.

L. Bas, M. J. Le-maitre, R. W. Streckeisen, A. Zanettin, and B. , A Chemical Classification of Volcanic Rocks Based on the Total Alkali-Silica Diagram, Journal of Petrology, vol.27, issue.3, pp.27-745, 1986.
DOI : 10.1093/petrology/27.3.745

P. Louis, Contribution géophysique à la connaissance géologique du bassin du Lac Tchad, Mémoires ORSTOM, 1970.

M. Boka and R. , Etude pétrographique, structurale et cartographique des formations géologiques de la région de Pala (Sud ? Ouest du Tchad) : implications métallogéniques, p.128, 2010.

W. F. Mcdonough and S. S. Sun, The composition of the Earth: Chemical Geology, pp.223-253, 1995.

J. P. Milési, P. Ledru, J. L. Feybesse, A. Dommanget, and E. Marcoux, Early proterozoic ore deposits and tectonics of the Birimian orogenic belt, West Africa, Precambrian Research, vol.58, issue.1-4, pp.305-344, 1992.
DOI : 10.1016/0301-9268(92)90123-6

G. V. Nesterenko and V. V. Kolpakov, Allochthonous native gold in piedmont alluvium in the southern West Siberia, Lithology and Mineral Resources 45, N°5, pp.425-442, 2010.
DOI : 10.1134/S0024490210050032

J. P. Nzenti, P. Barbey, J. Macaudière, and D. Soba, Origin and evolution of the late precambrian high-grade Yaounde Gneisses (Cameroon), Precambrian Research, vol.38, issue.2, pp.91-109, 1988.
DOI : 10.1016/0301-9268(88)90086-1

J. Penaye, A. Kröner, S. F. Toteu, W. R. Van-schmus, and J. C. Doumnang, Evolution of the Mayo Kebbi region as revealed by zircon dating: An early (ca. 740Ma) Pan-African magmatic arc in southwestern Chad, Journal of African Earth Sciences, vol.44, issue.4-5, pp.530-542, 2006.
DOI : 10.1016/j.jafrearsci.2005.11.018

J. A. Pearce, N. B. Harris, and A. G. Tiindle, Trace Element Discrimination Diagrams for the Tectonic Interpretation of Granitic Rocks, Journal of Petrology, vol.25, issue.4, pp.956-983, 1984.
DOI : 10.1093/petrology/25.4.956

P. Pinna, J. Y. Calvez, A. Abessolo, J. M. Angel, M. Mekoulou et al., Neoproterozoic events in the Tchollir?? area: Pan-African crustal growth and geodynamics in central-northern Cameroon (Adamawa and North Provinces), Journal of African Earth Sciences, vol.18, issue.4, pp.347-353, 1994.
DOI : 10.1016/0899-5362(94)90074-4

P. Projet and /. Chd, Rapport sur la prospection de l'or dans le Mayokebbi, DRGM, vol.87, issue.20, 1987.

W. Pohl, Metallogeny of the northeastern Kibara belt, Central Africa???Recent perspectives, Ore Geology Reviews, vol.9, issue.2, pp.105-130, 1994.
DOI : 10.1016/0169-1368(94)90024-8

W. Pohl and M. A. Gunther, The origin of Kibaran (late Mid-Proterozoic) tin, tungsten and gold quartz vein deposits in Central Africa: a fluid inclusions study, Mineralium Deposita, vol.26, issue.1, pp.51-59, 1991.
DOI : 10.1007/BF00202365

J. L. Poidevin, La tectonique panafricaine à la bordure du craton congolais: l'origine des "Oubanguides". XII ème Coll, Géol. Afr, pp.6-8, 1983.

A. Pouclet, M. Vidal, J. C. Doumnang, J. Vicat, and R. Tchameni, Neoproterozoic crustal evolution in Southern Chad: Pan-African ocean basin closing, arc accretion and late- to post-orogenic granitic intrusion, Journal of African Earth Sciences, vol.44, issue.4-5, pp.543-560, 2006.
DOI : 10.1016/j.jafrearsci.2005.11.019

URL : https://hal.archives-ouvertes.fr/hal-00073651

J. L. Schneider and J. P. Wolff, Carte géologique et cartes hydrogéologiques à 1/500, 1992.

M. Solomon and D. I. Groves, The Geology and Origin of Australia's Mineral Deposits, 1994.

. Soo-young and . Se-jung, Fluid inclusion and stable isotope studies of gold deposits in the Ganboke mineralized district, Geosciences Journal, vol.1, pp.27-45, 2001.

S. F. Toteu, J. Penaye, and Y. H. Poudjom-djomani, Geodynamic evolution of the Pan-African belt in central Africa with special reference to Cameroon, Canadian Journal of Earth Sciences, vol.41, issue.1, pp.73-85, 2004.
DOI : 10.1139/e03-079

H. Worku, Structural control and metamorphic setting of the shear zone-related Au vein mineralization of the Adola Belt (southern Ethiopia) and its tectono-genetic development, Journal of African Earth Sciences, vol.23, issue.3, pp.383-409, 1996.
DOI : 10.1016/S0899-5362(97)00009-2

W. R. Van-schmus, E. P. Oliveira, A. F. Da-silva-filho, S. F. Toteu, J. Penaye et al., The Central African Fold Belt Proterozoic links between the Borborema Province, NE Brazil, and the Central African Fold Belt, pp.69-99, 2008.