Jessell Mark, Santoul J., Baratoux Lenka, Youbi N., Ernst R. E., Metelka V., Miller J., Perrouty S. (2015). An updated map of West African mafic dykes. In :
Jessell Mark (ed.), Liégeois J.P. (ed.). Tectonics, mineralisation and regolith evolution of the West African Craton. Journal of African Earth Sciences, 112, part B (No spécial), p. 440-450. ISSN 1464-343X.
Titre du document
An updated map of West African mafic dykes
Année de publication
2015
Auteurs
Jessell Mark, Santoul J., Baratoux Lenka, Youbi N., Ernst R. E., Metelka V., Miller J., Perrouty S.
In
Jessell Mark (ed.), Liégeois J.P. (ed.), Tectonics, mineralisation and regolith evolution of the West African Craton
Source
Journal of African Earth Sciences, 2015,
112, part B (No spécial), p. 440-450 ISSN 1464-343X
Studies of mafic dyke swarms may simultaneously provide information on the mechanical, geochemical, geochronological and magnetic environments at the time of their formation. The mafic intrusive history of different cratons can also be potentially used to unravel their assembly into their current configuration. The identification and classification of dykes is a first step to all these studies. Fortunately, even in regions with poor outcrop, we can use the strong magnetic response of mafic dykes to identify and map their extent. In West Africa the first maps of mafic dyke distribution were made over 40 years ago, but there are still large areas where there are almost no published data. In this paper we present a significantly updated map of mafic dykes for the West Africa Craton based in large part on new interpretations of the regional airborne magnetic database. This map includes the locations of over three thousand dykes across the craton, which locally shows several orientation clusters that provide a minimum estimate for the total number of dyke swarms in this region. Whilst we will have to wait until systematic dating of the different swarms is completed, we can demonstrate that there is a long and complex history of mafic magmatism across the craton, with up to 26 distinct dyke swarms mapped based according to their orientation. The mapping and dating of these swarms will provide key constraints on the assembly of the fragments that make up the modern continents.
Plan de classement
Géologie et formations superficielles [064]
;
Géophysique interne [066]
Description Géographique
AFRIQUE DE L'OUEST
Localisation
Fonds IRD [F B010066071]
Identifiant IRD
fdi:010066071
