b'The origin of the Bangui magnetic anomalyFeatureFigure 3.Location of ground gravity station in North-Central African Region (Njiteu etal. 2021a)anomaly map in Cameroon (Collignon 1968). Using this map,signals. Using the EGM2008 gravity data Ngatchou etal. (2014) Dumont (1986) maps the extension of the Sanaga fault, andobtained a similar results to those of Poudjom Djomani etal. specifies the northern boundary of the Congo Craton at 4N(1992); Boukeke (1994); Poudjom Djomani etal. (1995); Poudjom of latitude over more than 100 km, also its NE-SW extensionDjomani etal. (1997); Tadjou etal. (2009).beneath the Sanaga fault. At the end of the complementaryNgalamo etal. (2017); Ngalamo etal. (2018), evaluated the campaigns undertaken between 1968 and 1986 by the PrincetonMoho depths beneath the Congo Craton and the Central University and the ELF company, Poudjom Djomani (1993) andAfrican Orogenic Belt (CAOB) in Cameroon, the lithosphere-Boukeke (1994) showed through the analysis of a new Bouguerasthenosphere boundary, and highlighted meta-cratonisation anomaly map that the Congo Craton is associated with a pairat the northern edge of the Congo Craton. However, according of parallel, positive and negative E-W anomalies: the positiveto signal processing, these results remain debatable or even anomaly lies to the North, on the mobile zone side, and thelimited. Moreover, the Congo Craton extends E-W between negative anomaly, to the South on the craton side. BoukekeCameroon and Central African Republic. Considering the (1994) showed by an Euler deconvolution applied to the Bouguersouthern limit of the Saharan meta-craton, Abdelsalam etal. anomaly map, a series of NE-SW structures linked to each other(2002) proposed a generalised remobilisation of the crust and superimposed on the Sanaga fault. The determination ofbetween the northern edge of the Congo Craton in Central crustal thicknesses by spectral analysis allowed estimation ofAfrican Republic and the eastern margin of the West African the Moho depth at 26 km on the boundary between the CongoCraton. The crustal structure in the North-Central African Region Craton and the Pan African fold belt. Poudjom Djomani (1993)beneath the West and Central African Rift System (WCARS) and showed a progressive thickening of the crust from North to Souththe Congo Craton remains poorly known.Cameroon. These ground gravity data were completed by some additional campaigns undertaken by the Princeton UniversityIn Central Africa, data related to lithospheric structures and (1968), ELF (1980), University of Leeds and IRGM (Institute fortheir mechanical behaviour are very limited. Two major Geological and Mining Research) between 1982 and 1988. Thestructures are particularly interesting: the Adamawa-Yade new database obtained, together with information from 1960 toPlateau (Dorbath etal. 1985; Poudjom Djomani etal. 1997; 1988, supported the development of a new and more completeNnange etal. 2000; Tokam etal. 2010; Aubreya etal. 2015; Bouguer gravity map, between 1N and 14N of latitude and 8EEbinger etal. 2017); and the Bangui Magnetic Anomaly to 17E of longitude (Poudjom Djomani etal. 1995). Based on(Godivier etal. 1962; Benkova etal. 1973; Godivier and these data, gravity modelling at the northern edge of the CongoLedonche 1980; Dorbath etal. 1981; Dorbath etal. 1985; Craton suggests the presence of an E-W gradient zone thatRegan and Marsh 1982; Ravat 1989; Ouabego etal. 2013; juxtaposes the Congo Craton to the south, and the Pan AfricanLaunay etal. 2018).belt to the north at a depth of ~20 km (Tadjou etal. 2009).A first solution to the scattered coverage of ground gravity dataRecent geophysical investigations based on gravity and would have been the integration of the satellite data into themagnetic dataterrestrial database. However, the problem with the integrated (satellite, airborne/ground) data remains the same: gravityOur study was built around three main databases: two gravity anomalies are a coalescence of short and long wavelengthdatabases (ground data (Figure 3) and satellite-only data, FEBRUARY 2022 PREVIEW 46'