The West African Orogens and Circum-Atlantic Correlatives by R. D. Dallmeyer, J. P. Lécorché (auth.), Dr. R. D.

By R. D. Dallmeyer, J. P. Lécorché (auth.), Dr. R. D. Dallmeyer, Dr. J. P. Lécorché (eds.)

In December, 1987, venture 233 of the overseas Geological Correlation seasoned­ gram hosted a world convention in Nouakchott, Mauritania. Discussions have been desirous about the "Tectonothermal Evolution Of The West Mrican Orogens And Circum-Atlantic Terrane Linkages". A wealth of recent details was once pre­ sented throughout the convention, and it was once obvious that the time used to be acceptable to arrange a scientific quantity facing the geology of northwest Mrica. the current quantity is an outgrowth of this convention, yet isn't only a compilation of the papers provided in Nouakchott. in its place, it represents a coordinated vol­ ume designed to offer a balanced, complete view of our current lower than­ status of West Mrican geology and capability correlations in different Circum-At­ lantic Paleozoic orogens. We clearly get pleasure from the efforts of all of the reviewers whose reviews have tremendously helped to enhance the standard of this quantity. We additionally thank a few of the participants for his or her diligence and perseverance in manuscript coaching. The calibre of the current quantity is a mirrored image in their hard work. Athens/Marseille, Autumn 1990 R. D. DALLMEYER J. P. LECORCHE Contents bankruptcy 1 creation . . . . . . . . . . . . . . . three R. D. DALLMEYER and J. P. LECORCHE bankruptcy 2 Geophysics and the Crustal constitution of West Africa nine J. ROUSSEL and A. LESQUER bankruptcy three Crystalline Basement of the West African Craton . . . . . . . . . . . . .. . . 31 .

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ROCCI\ G. BRONNER 2 and M. DESCHAMPSl The West African craton is a very extensive portion of Precambrian crust ( -4500000 km 2), stable since 1700 Ma ago, bounded on all sides by more recent mobile belts mainly of Pan-African age, such as the Mauritanide fold belt (Fig. 1) on the western edge. More than half of the craton is covered by sediments, the main part of them constituting the huge Taoudeni Basin. Even the earliest sediment (1000 Ma) are generally undeformed, except within the Mauritanides fold belt.

Bull Serv Carte Geol Alger 23: 328 Gibb RA, Thomas MD (1976) Gravity signatures of fossil plate boundary in the Canadian shield. Nature (Lond) 262: 199-200 Gibb RA, Thomas MD, Lapointe PL, Muckhopadhyay M (1983) Geophysics of proposed proterozoic sutures in Canada. Precambrian Res 19: 349-384 Guetat Z (1981) Etude gravimetrique de la bordure occidentale du craton ouest africain. These 3e cycle, Univ Montpellier, 185 pp Guieu G, Roussel J (1984) Une interpretation des bassins cotiers ouest -africains a partir de l'histoire des depots saliferes, dans Ie cadre de l'ouverture de l'Atiantique.

1973) 1993 average age (biotite) 10 meas. Lameyre and Lasserre (1967) Rocci (1966) Bonhomme (1962) Vachette et al. (1973) Lasserre et al. (1970) 1438 1514 Dosso et al. (1979) Shield Dykes Western Archean Groups Tiris KlAr 1811 average age (biotite) 14 meas. Arnsaga { Tasiast Reguibat Shield Dykes N-S ENE-WSW N20 } 1609±45 1610} KI Ar 1757 Vachette (1964) Giraudon and Vachette (1964) Bonhomme (1962) Barrere (1967) Vachette and Bronner (1975) Dallmeyer and Ucorche (1990) Dosso et al. (1979) Crystalline Basement of the West African Craton 2.

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