Downloaded from http://sp.lyellcollection.org/ by guest on September 25, 2021 Mineralization and sustainable development in the West African Craton: from field observations to modelling Tahar Aïfa Université de Rennes, CNRS, Géosciences Rennes–UMR 6118, Bât. 15, Campus de Beaulieu, 35042 Rennes, France 0000-0002-1573-7668
[email protected] Abstract: This Special Publication combines results obtained by interdisciplinary groups from numerous aca- demic institutions working on Paleoproterozoic formations to decipher the origins of the main mineralization resources in the West African Craton (WAC) and their impacts on African economic development. Structural, geophysical, sedimentological, stratigraphical, geochemical, petrophysical and mineralogical analyses have been used to highlight the complexities involved in mineralization emplacement and its origin and evolution within the WAC. Fourteen articles, mainly of basic research carried out in the WAC and surrounding areas, contribute to new knowledge in mineral research with updated references. They show that the geodynamic evo- lution of the WAC is complex from one area to another: it involves subduction, collision and obduction during several deformation phases ranging from Birimian (2.3–2.0 Ga) to Pan-African (650–450 Ma) events. Miner- alization is mainly controlled by tectonics within shear zones, orogenic belts, basins and faulting systems occur- ring in the various corridors. Mineralized fluid circulation is stressed and injected into appropriate formations and precipitate several types of well-documented ore deposits: porphyry, metal-bearing, volcanogenic massive sulfide, sedimentary exhalative and lateritic. Various modelling techniques, when integrated, help in under- standing the mechanisms of mineralization emplacement, some of which are still a matter of debate.