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Comptes Rendus Géoscience
Volume 336, n° 9
pages 807-814 (juillet 2004)
Doi : 10.1016/j.crte.2004.01.006
Received : 4 Mars 2003 ;  accepted : 19 January 2004
Les sillons plissés du Burundien supérieur dans la chaîne Kibarienne d'Afrique centrale
The Upper Burundian fold belts in central Africa

Michel  Villeneuve a * ,  Jean  Chorowicz b
aUMR 6019, université de Provence et CNRS, case 67, 3, place Victor-Hugo, 13331, Marseille cedex 13, France 
bLaboratoire de tectonique, case 129, Université Paris-6, 4, place Jussieu, 75252 Paris cedex 05, France 

*Auteur correspondant.
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La chaîne Kibarienne (1600-970 Ma), qui affleure dans la région des grands lacs africains, a longtemps posé des problèmes stratigraphiques et notamment celui de la différenciation entre le Burundien sédimentaire (Burundien supérieur) et son substratum. Cette distinction est rendue malaisée par le métamorphisme (souvent accompagné de venues granitiques) qui touche aussi bien les formations antérieures déjà métamorphisées que les sédiments du Burundien supérieur. Cette note montre que la discordance observée initialement sur le flanc ouest du synclinal de l'Itombwe accrédite l'hypothèse d'une subdivision d'un Burundien inférieur plissé et métamorphisé avant le dépôt des formations du Burundien supérieur. Pour citer cet article : M. Villeneuve, J. Chorowicz, C. R. Geoscience 336 (2004).

Mots clés  : Afrique centrale ; Kivu ; Rwanda ; Burundi ; Protérozoïque moyen ; chaîne Kibarienne ; Burundien supérieur.

Abstract

The Kibaran belt that extends all over the central Africa, from the Katanga to the southern Uganda, straddles the African great lakes area. The Kibaran stratigraphy is one of the most debated questions. Some geologists favoured two different systems: the Ruzizian system (1800-2000 Ma) and the Burundian or Kibaran system (1600-960 Ma). Some others favoured a single Burundian system with large areas granitised and metamorphosed during several Burundian tectonic events and with a lot of sedimentary fold belts of the Burundian age. Recent geological data and new remote sensing interpretations allow us to favour the second hypothesis but with a major disconformity within the Burundian system which is separating the Upper and the Lower Burundian. To cite this article: M. Villeneuve, J. Chorowicz, C. R. Geoscience 336 (2004).

Mots clés  : Central Africa ; Kivu ; Rwanda ; Burundi ; Mesoproterozoic ; Kibaran belt ; Upper Burundian.




© 2004  Académie des sciences@@#104156@@

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