Geophysics and the Crustal Structure of West Africa

摘要: West Africa, facing the Laurentian basement of North America and Brazilian craton South in a Bullard-type predrift reconstruction, is largely identified to African (a Precambrian granitized basement) its surrounding Upper Proterozoic (Pan-African) mobile belts. In contrast with relatively complete geological studies (Fabre 1983), Africa did not benefit from large number extensive geophysical studies. Only gravity measurements have resulted nearly regional mapping thereby are useful for investigation crustal structure clarification interpretation. places, seismological such as detection teleseismic travel time anomalies or surface waves velocity dispersion measurements, magnetotelluric soundings, heat flow been made. Considering total absence deep seismic profiles, all these data furnish precious adjunct knowledge upper mantle structures Africa.